5 Werkstofftechnik
Filtern
Dokumenttyp
- Zeitschriftenartikel (389) (entfernen)
Sprache
- Englisch (376)
- Deutsch (6)
- Mehrsprachig (5)
- Französisch (1)
- Russisch (1)
Schlagworte
- Additive manufacturing (24)
- Corrosion (19)
- EBSD (17)
- Additive Manufacturing (16)
- Microstructure (14)
- Transmission electron microscopy (13)
- Creep (12)
- Residual stress (12)
- Glass (11)
- Steel (11)
- Crystallization (9)
- Sintering (8)
- Aging (7)
- Fatigue (7)
- High entropy alloy (7)
- CCS (6)
- Carbon steel (6)
- Electron microscopy (6)
- High temperature corrosion (6)
- Mechanical properties (6)
- SEM (6)
- 3D printing (5)
- Bioactive glass (5)
- CALPHAD (5)
- Ceramics (5)
- Degradation (5)
- High entropy alloys (5)
- Metallic glasses (5)
- Neutron diffraction (5)
- Oxidation (5)
- Alumina (4)
- EXAFS (4)
- Electron backscatter diffraction (4)
- HIP (4)
- High alloyed steel (4)
- Impurities (4)
- Kikuchi patterns (4)
- Laser powder bed fusion (4)
- Lattice parameters (4)
- Martensite (4)
- Metallic glass (4)
- Molecular dynamics (4)
- Nanoindentation (4)
- Nanoparticles (4)
- Pattern matching (4)
- Plastic deformation (4)
- Plasticity (4)
- Raman spectroscopy (4)
- Scanning electron microscopy (4)
- Vickers indentation (4)
- X-ray diffraction (4)
- 3D-Printing (3)
- AISI 316L (3)
- Binder Jetting (3)
- Calcination (3)
- Carbon fibres (3)
- Ceramic (3)
- Corrosion Fatigue (3)
- Corrosion fatigue (3)
- Crack propagation (3)
- Damage (3)
- Diffusion (3)
- Dislocation (3)
- Finite element analysis (3)
- Fracture (3)
- Fracture mechanics (3)
- Fracture toughness (3)
- General Materials Science (3)
- Glass transition (3)
- Grain boundary (3)
- Heat treatment (3)
- Interfacial strength (3)
- Iron (3)
- Kikuchi diffraction (3)
- Mechanical Engineering (3)
- Mechanics of Materials (3)
- NMR spectroscopy (3)
- Nickel-based superalloys (3)
- Ontology (3)
- Permeability (3)
- Phase-field (3)
- Phase-field simulation (3)
- Pitting (3)
- Reproducibility (3)
- Single crystal (3)
- Stress intensity factor (3)
- Superalloy (3)
- TEM (3)
- Thermal expansion (3)
- Ti-6Al-4V (3)
- Viscosity (3)
- X-ray refraction (3)
- Zirconia (3)
- 3D-printing (2)
- AGIL (2)
- AISI 304L (2)
- Al2O3 (2)
- Alkali zinc borate glasses (2)
- Alloy design (2)
- Aluminosilicate glasses (2)
- Aluminum alloy (2)
- Aluminum alloys (2)
- Aquifer (2)
- Atom probe tomography (2)
- Bacteria (2)
- Binder jetting (2)
- Bioactivity (2)
- Bioceramics (2)
- Bone regeneration (2)
- CCUS (2)
- Calcium cobaltite (2)
- Carbon capture and storage (2)
- Carbon storage (2)
- Characterization (2)
- Chemically complex alloy (2)
- Coating (2)
- Compositionally complex alloys (2)
- Computed Tomography (2)
- Computed tomography (2)
- Condensate (2)
- CrMnFeCoNi (2)
- Crack growth (2)
- Crack healing (2)
- Crop protection products (2)
- Crystal orientation (2)
- Crystal plasticity (2)
- Deep Learning (2)
- Defects (2)
- Density-based Phase-Field Modelling (2)
- Densty-based Thermodynamics (2)
- Deuterium (2)
- Diopsid (2)
- Ductile iron (2)
- Elastic constants (2)
- Electron diffraction (2)
- Environmental stress cracking (2)
- Environmental stress cracking (ESC) (2)
- Environmentally assisted cracking (2)
- Foaming (2)
- Fractography (2)
- Fracture surface energy (2)
- Full notch creep test (FNCT) (2)
- GFRP (2)
- Geothermal (2)
- Glass ceramic (2)
- Glass powder (2)
- Glass-ceramic (2)
- Gold (2)
- Grain boundaries (2)
- Grain boundary engineering (2)
- High Alloyed Steel (2)
- High-density polyethylene (2)
- High-entropy alloy (2)
- Hydrogen (2)
- IN718 (2)
- Inconel 625 (2)
- Inconel 718 (2)
- Infrared spectroscopy (2)
- Interfacial shear strength (2)
- Internal friction (2)
- Interphase (2)
- Ionic porosity (2)
- Kikuchi pattern (2)
- LPBF (2)
- LTCC (2)
- Laser Powder Bed Fusion (2)
- Laser ablation in liquid (2)
- Laser scanning microscopy (LSM) (2)
- Lattice distortion (2)
- Lattice misfit (2)
- Layerwise Slurry Deposition (2)
- Layerwise slurry deposition (2)
- Lead borate glasses (2)
- Low cycle fatigue (2)
- Lunar regolith (2)
- Machine Learning (2)
- Mars (2)
- Martensitic transformation (2)
- Mass transport (2)
- Microhardness (2)
- Microstrucrue Design (2)
- Microstructural characterization (2)
- Microstructure Design (2)
- Microstructure and texture (2)
- Microstructure evolution (2)
- Modeling (2)
- Nano-powder (2)
- Native oxide (2)
- Nickel alloys (2)
- Nickel-base superalloys (2)
- Niobium alloying (2)
- Orientation precision (2)
- Ostwald ripening (2)
- Oxyfuel (2)
- P92 (2)
- Particle morphology (2)
- Phase transformations (2)
- Polyethylene (2)
- Polymer (2)
- Porosity (2)
- Preceramic polymer (2)
- Precipitation (2)
- Pressure-assisted sintering (2)
- Quasicrystal (2)
- Rapid solidification (2)
- Reaction-sintering (2)
- Relaxation (2)
- Roughness (2)
- S-Phase (2)
- SIMS (2)
- Sample preparation (2)
- Selective laser melting (2)
- Self-healing (2)
- Shape-memory alloys (2)
- Shear bands (2)
- Short-range order (2)
- Silicon carbide (2)
- Silicon nanowires (2)
- Single-crystals (2)
- Solubility (2)
- Sorption (2)
- Spray drying (2)
- Steels (2)
- Stress corrosion cracking (2)
- Stress relaxation (2)
- Sulfidation (2)
- Sulphidation (2)
- Superalloys (2)
- Superconducting magnet (2)
- Surface treatments (2)
- Tempered martensite-ferritic steel (2)
- Tensile properties (2)
- Texture (2)
- Thermodynamics (2)
- Thermoelectric properties (2)
- Thermography (2)
- Titanium oxide (2)
- ToF-SIMS (2)
- Transmission electron microscopy (TEM) (2)
- Viscous sintering (2)
- Water content (2)
- Water speciation (2)
- Wetting (2)
- X-ray absorption spectroscopy (2)
- 12%Cr steel (1)
- 150 Years (1)
- 2PP (1)
- 316L (1)
- 3D Druck (1)
- 3D etching (1)
- 3D metallography (1)
- 3D-Metallographie (1)
- 3D-finite element modeling (1)
- 4-Dimensional scanning transmission (1)
- 9-12%Cr steel (1)
- ATZ (1)
- Abrasion (1)
- Accelerated temporal integration (1)
- Acid-leaching (1)
- Additive Fertigung (1)
- Adolf Martens (1)
- Advanced high strength steels (1)
- Advanced wastewater treatment (1)
- Ageing (1)
- Agglomerates (1)
- Aggressive environments (1)
- Al alloys (1)
- Al-Cu alloy (1)
- Al-Cu binary alloy system (1)
- Al-Cu-Li-alloy (1)
- Alcium alkali phosphate (1)
- Alkali aluminosilicate glasses (1)
- Alkali and alkaline earth silicate and borate glass (1)
- Alkali-activated materials (1)
- Alloy (1)
- Alloy Safety (1)
- Alloy microstructure (1)
- Alloys (1)
- Alloys' Safety (1)
- Alpha-tricalcium phosphate (1)
- Alterung (1)
- Alumina coatings (1)
- Alumina toughened zirconia (1)
- Aluminium alloys (1)
- Aluminiumlegierung (1)
- Amorphization (1)
- Amorphous silica (1)
- Analytical scanning electron microscopy (1)
- Angle measurement (1)
- Annealing (1)
- Anticorrosion (1)
- Approximant (1)
- Aquifer fluid (1)
- Artificial weathering (1)
- Atomistic Simulation (1)
- Atomistic simulations (1)
- Austenite-to-martensite phase transformation (1)
- Austenitic alloys (1)
- Austenitic steel 316L (1)
- Automated Bragg angle determination (1)
- Automated analysis (1)
- Automated image analysis (1)
- BTEX (1)
- Bacterial attachment (1)
- Batch reactions (1)
- Behmite (1)
- Biaxial strength (1)
- Bimodal distribution (1)
- Binders/binding (1)
- Bio Ceramic (1)
- Bio Ceramics (1)
- Bio active ceramic (1)
- Bio-ceramic engineering (1)
- Bioactive Glass (1)
- Bioactive bone grafting material (1)
- Bioactive glass scaffold (1)
- Biodiesel (1)
- Biogeochemical cycling (1)
- Biogeochemistry (1)
- Biomineralisation (1)
- Biopolymer (1)
- Biphasic calcium phosphate (1)
- Bitter technique (1)
- Blended learning (1)
- Bond energy (1)
- Bone marrow-derived mesenchymal stem cell (1)
- Borate (1)
- Borosilicate glass (1)
- Bragg angles (1)
- Brass (1)
- Bravais lattice (1)
- Bravais lattices (1)
- Brinell hardness (1)
- Brittle fracture (1)
- Brown-rot fungi (1)
- Bruchflächen (1)
- Bubble formation (1)
- Bulk metallic glasses (1)
- Burst (1)
- C. lap-shear (1)
- CALPHAD database analysis (1)
- CCUS, supercritical/dense phase CO2, carbon steels, martensitic steel, superaustenite steel, droplet corrosion (1)
- CFRP (1)
- CO2 (1)
- CO2 pipeline transport (1)
- CO2 quality (1)
- CO2 separation membranes (1)
- Cabon capture and storage (1)
- Calcium Cobaltite (1)
- Calcium alkali orthophosphate materials (1)
- Calculated intrinsic fracture toughness (1)
- Carbide phase NbC (1)
- Carbidic austempered ductile iron (1)
- Carbon Fiber Reinforced Plastics (1)
- Carbon Fibre (1)
- Carbon capture (1)
- Carbon capture storage (1)
- Carbon capture, utilization and storage technology (1)
- Carbon dioxide (1)
- Carbon nanotubes (1)
- Casing (1)
- Cavitation (1)
- Ccs (1)
- Cellular substructure (1)
- Cellulose (1)
- Cement (1)
- Cement-based materials (1)
- Ceramic nano particles (1)
- Ceramics 3D printing (1)
- Cerium oxide (1)
- Chalcogenides (1)
- Characterisation (1)
- Chemo-mechanical coupling (1)
- Chemometrics (1)
- Chrystal orientation (1)
- Classification (1)
- Clay ISRU (1)
- Co2-Storage (1)
- Cobald based alloy (1)
- Coefficient of thermal expansion (1)
- Composite (1)
- Composite recycling (1)
- Compositionally complex alloy (1)
- Condensed Matter Physics (1)
- Confined catalyst (1)
- Coniophora puteana (1)
- Contact angle (1)
- Contact fatigue (1)
- Contact mechanics (1)
- Cooling rate (1)
- Coordinate measurement machine (1)
- Copper vacancies (1)
- Corrosion costs (1)
- Corrosion mechanism (1)
- Corrosion pits (1)
- Corrosion protection (1)
- Corrosion resistance (1)
- Coulomb explosion (1)
- Coûts de la corrosion (1)
- CrCoNi (1)
- CrN/NbN (1)
- Crack arrest (1)
- Crack evolution (1)
- Crack growth in air (1)
- Crack initiation (1)
- Crack opening displacement (1)
- Crack tip opening displacement (1)
- Cracks (1)
- Craze–crack mechanism (1)
- Creation-relaxation algorithm (1)
- Creep behavior (1)
- Creep mechanisms (1)
- Creep strength (1)
- Creep under thermal cycling (1)
- Creep-fatigue (1)
- Creep-fatigue interaction (1)
- Critical energy release rate (1)
- Cross-sectioning (1)
- Crosslinking (1)
- Cryogenic (1)
- Cryogenic cycling (1)
- Crystal Texture (1)
- Crystal growth (1)
- Crystal growth velocity (1)
- Crystal lattice (1)
- Crystal lattice period (1)
- Crystal morphology (1)
- Crystalline defects (1)
- Crystallographic texture (1)
- Cubical shape (1)
- Cupriavidus metallidurans (1)
- Cuttlefish (1)
- Cyclic softening (1)
- Cyclic steam oxidation (1)
- Cytocompatibility (1)
- D. aging (1)
- D. creep D. viscoelasticity (1)
- DCB (1)
- DCB geometry (1)
- Data Interoperability (1)
- Data analysis (1)
- Data infrastructures (1)
- Data mapping (1)
- Data processing (1)
- Datenbank (1)
- Debonding (1)
- Defect detection (1)
- Defects engineering (1)
- Deformation (1)
- Deformation mechanisms (1)
- Degradation signatures (1)
- Density-based Model (1)
- Density-based Thermodynamics (1)
- Density-based model (1)
- Dental (1)
- Dentine (1)
- Deposition microstructure (1)
- Desorption (1)
- Destabilization (1)
- Dielectric breakdown (1)
- Dielectric properties (1)
- Diesel (1)
- Diesel Fuel (1)
- Differential scanning calorimetry (1)
- Differential scanning calorimetry (DSC) (1)
- Diffraction (1)
- Diffraction Enhanced Imaging (1)
- Diffraction contrast (1)
- Diffusivity (1)
- Digital image correlation (1)
- Digital representations (1)
- Digital workflows (1)
- Digitalization (1)
- Dimensional mismatch of crystalline lattice periods (misfit) (1)
- Directional grain growth (1)
- Dislocation avalanches (1)
- Disorientation (1)
- Dispersion process (1)
- Distributed fiber optic sensing (1)
- Diversity (1)
- Domain Ontology Development (1)
- Double notched creep specimen (1)
- Dry preparation (1)
- Drywood termite (1)
- Dwell periods (1)
- Dwell times (1)
- Dynamic recrystallization (1)
- EFTEM (1)
- EN AW-2618A (1)
- Early oxidation (1)
- Early stages (1)
- Early sulfidation (1)
- Efficiency (1)
- Elastic energy (1)
- Elastic microstructure (1)
- Elastic modulus (1)
- Elastic properties (1)
- Elasticity (1)
- Electric conductivity (1)
- Electrical insulators (1)
- Electrical resistance (1)
- Electrochemical characterisation (1)
- Electrochemical deposition (1)
- Electrochemical impedance spectroscopy (1)
- Electron back-scattered diffraction (1)
- Electron backscattered diffraction (1)
- Electron energy (1)
- Electron microscopy, transmission (1)
- Electronic (1)
- Enamel (1)
- End of life (1)
- Endothelial progenitor cell (1)
- Endurance Limit (1)
- Energiedisersive Röntgenspektroskopie (1)
- Energy distribution (1)
- Environment (1)
- Environmental Stress Cracking (1)
- Epitaxial films (1)
- Epoxy Resin (1)
- Epoxy resin (1)
- Equilibrium relaxation (1)
- Eutectic (1)
- Expanding cavity model (1)
- Experimental and numerical techniques (1)
- Explosive welding (1)
- Exposed metal sites (1)
- FAIR (1)
- FAIR Data Management (1)
- FAIR research data management (1)
- FIB Tomography (1)
- FSDC (1)
- Fabrication (1)
- Faceting (1)
- Facilitated activation (1)
- Failure mechanisms (1)
- Failure rate (1)
- Fatigue Testing (1)
- Fatigue crack propagation stages (1)
- Fatigue performance (1)
- Fatigue striations (1)
- Fe-Mn steels (1)
- Femtosecond laser (1)
- Ferritic steels (1)
- Ferritic–martensitic steel (1)
- Ferrous phosphate hydrate (1)
- Fiber-matrix interface (1)
- Fiber/matrix bond (1)
- Fibre reinforced plastic (1)
- Fibre/matrix bond (1)
- Fibre/matrix bonding (1)
- Filters (1)
- Finite element method (1)
- Finland (1)
- First derivative (1)
- Flowability (1)
- Fluoride nanoparticles (1)
- Fluorolytic sol−gel (1)
- Four-point bending test (1)
- Fourier series (1)
- Fourier transform infrared spectroscopy (1)
- Fracture surface analysis (1)
- Fracture surfaces (1)
- Fragility (1)
- Fraktographie (1)
- Freeze casting (1)
- Fresnoite (1)
- Friction (1)
- Friction Stir Welding (1)
- Friction stir processing (1)
- Frozen state photopolymerization (1)
- Fuel sorption (1)
- Full Notch Creep Test (1)
- Full notch creep test (1)
- Fullerite (1)
- Fungi (1)
- GD-OES (1)
- GMR (1)
- GMR sensors (1)
- Gas flow assisted powder deposition (1)
- Gefügeanalyse (1)
- Gefügerekonstruktion (1)
- General Chemistry (1)
- General Computer Science (1)
- General Engineering (1)
- Geometrical factors (1)
- Glass Ceramic (1)
- Glass capillaries (1)
- Glass crystallization stress (1)
- Glass fiber reinforced polymer (1)
- Glass fiber reinforced polymers (1)
- Glass fiber-epoxy composites (1)
- Glass fibre (1)
- Glass forming (1)
- Glass forming melts (1)
- Glass liner (1)
- Glass manufacturing (1)
- Glass-ceramics (1)
- Glass-ceramics definition (1)
- Global stability criterion (1)
- Gnomonic projections (1)
- Grade S960QL steel (1)
- Gradient-enhanced fatigue model (1)
- Grain Boundary (1)
- Grain Boundary Corrosion (1)
- Grain Boundary Phase Diagram (1)
- Grain Boundary Segregation (1)
- Grain Boundary Spinodal (1)
- Grain boundary oxidation (1)
- Grain boundary phase diagram (1)
- Grain boundary precipitates (1)
- Grain boundary structure (1)
- Grain boundary thermodynamics (1)
- Grain growth (1)
- Grain structure (1)
- Granules (1)
- Graphite (1)
- Growth kinetics (1)
- Growth rate (1)
- Hausner ratio (1)
- Heat accumulation (1)
- Heat-resistant nickel alloys (1)
- Hertzian cracks (1)
- Hierarchical microstructure (1)
- Hierarchical microstructure Premartensite (1)
- Hierarchical porosities (1)
- High - temperature (1)
- High Cycle Fatigue (1)
- High Entropy Alloy (1)
- High Entropy Alloys (1)
- High density polyethylene (1)
- High interstitial austenitic steel (1)
- High pressure (1)
- High temperature nickel-based eutectic alloys (1)
- High temperature oxidation (1)
- High temperatures (1)
- High-Entropy Alloys (1)
- High-Entropy Materials (1)
- High-entropy alloys (1)
- High-temperature corrosion (1)
- High-temperature oxidation (1)
- High-temperature properties (1)
- High-voltage testing (1)
- High‐temperature corrosion (1)
- Hipims (1)
- Hochleistungskeramik (1)
- Homogenization (1)
- Hot isostatic pressing (HIP) (1)
- Hot pressing (1)
- Hot stage microscopy (1)
- Hybrid Manufacturing (1)
- Hydrogel (1)
- Hydrogen diffusivity (1)
- Hydrogen permeation (1)
- Hydrogen storage (1)
- Hydrogen storage tank (1)
- Hydrothermal Ageging (1)
- Hydrous glass (1)
- Hygrothermal (1)
- IASCC (1)
- IN 718 (1)
- IR spectroscopy (1)
- ISRU (1)
- Impact damage (1)
- Impact wear (1)
- In situ diffraction (1)
- In situ tensile test (1)
- In situ thermal-annealing experiment (1)
- In-situ ED-XRD (1)
- In-situ Process Monitoring (1)
- In-situ SEM micro shear deformation (1)
- In-situ composites (1)
- In-situ process monitoring (1)
- In-vivo (1)
- Incipient plasticity (1)
- Inclusion cluster (1)
- Inclusion size (1)
- Inconel 686 (1)
- Incremental lifetime models (1)
- Indentation (1)
- Indentation fracture toughness (1)
- Indentation hardness (1)
- Industrial and Manufacturing Engineering (1)
- Infrared nano AFM (1)
- Infrarotspektroskopie (1)
- Inkjet (1)
- Inter layer time (1)
- Interdiffusion (1)
- Interface (1)
- Interfacial Strength (1)
- Interfacial anisotropy (1)
- Interfacial free energy (1)
- Interlaboratory comparability (1)
- Intermetallic (1)
- Intermittent microplasticity (1)
- Intermodulation AFM (1)
- Internal Sulfidation (1)
- Internal Surfaces (1)
- Internal oxidation (1)
- Intrinsic stress (1)
- Invar (1)
- Inverted classroom (1)
- Ion beam erosion Sectioning (1)
- Iron meteorite (1)
- Iron oxide (1)
- Irradiation (1)
- Isostatic hot pressing (HIP) (1)
- JMAK model (1)
- Joints/joining (1)
- KCl (1)
- KI (1)
- Kernel average misorientation (1)
- Keywords: Poly(ether ether ketone) (1)
- Kikuchi bands (1)
- Knowledge Representation (1)
- Knowledge graphs (1)
- Knowledge representation (1)
- LIBS (1)
- LSD print (1)
- Laboratory X-ray diffraction (1)
- Laser (1)
- Laser Powder Bed Fusion (LPBF) (1)
- Laser beam melting (1)
- Laser beam melting (LBM) (1)
- Laser cladding (1)
- Laser powder-based directed energy deposition (1)
- Laser-induced slip casting (1)
- Lattice distortions (1)
- Lattice parameter determination (1)
- Lattice point density (1)
- Lattice rotation (1)
- Lattice structures (1)
- Lattices (1)
- Laves phase (1)
- Layered manganese oxide (1)
- Layering misalignment (1)
- Lebensdauervorhersage (1)
- Lecture films (1)
- Li-ion battery (1)
- Lifetime prediction (1)
- Light curing (1)
- Lindemann criterion (1)
- Linear elastic fracture mechanics (1)
- Linked open data (1)
- Liquid Metal Embrittlement (1)
- Liquid metal embrittlement (1)
- Liquid phase sintering (1)
- Liquid-metal embrittlement (1)
- Lithography-based technologies (1)
- Log-normal distribution (1)
- Long-term aging (1)
- Long-term calculation (1)
- Long-term storage (1)
- Low carbon steel (1)
- Low expansion (1)
- Low strain (1)
- Low-loading (1)
- MGS-1 regolith simulant (1)
- MOF-74 (1)
- MOUSE (1)
- Machine learning (1)
- Magmatic and hydrothermal processes (1)
- Magnetic domain distribution (1)
- Magnetic shape memory (1)
- Magnetic stray field (1)
- Magnetic stray fields (1)
- Magnetomechanical effect (1)
- Martensitic steel (1)
- Martensitic steels (1)
- Martensitic structure (1)
- Master curve (1)
- Material degradation (1)
- Material failure (1)
- Material modeling (1)
- Materials Chemistry (1)
- Materials Modelling (1)
- Materials Testing (1)
- Materials informatics (1)
- Materials science (1)
- Materials science and engineering (1)
- Matrix residual stress (1)
- Mean atomic number (1)
- Mean-field modelling (1)
- Mechanical anisotropy (1)
- Mechanical behavior (1)
- Mechanical deformation (1)
- Medium Entropy Alloys (1)
- Medium entropy alloys (1)
- Melt pool boundary (1)
- Melting (1)
- Meta material (1)
- Metal Magnetic Memory (1)
- Metal additive manufacturing (1)
- Metal and alloys (1)
- Metal magnetic memory (1)
- Metallic materials (1)
- Metals and Alloys (1)
- Methodology (1)
- Micro-shrinkages (1)
- Microplastic stress (1)
- Microplastics (1)
- Microsegregation (1)
- Microstructur (1)
- Microstructural changes of a Fe Si alloy (1)
- Microstructural evolution (1)
- Microstructure analysis (1)
- Microstructure, γ/γ' misfit (1)
- Microstrucure reconstruction (1)
- Microwave technology (1)
- Mikrostruktur (1)
- Milling (1)
- Mis-match (1)
- Misfitting precipitate (1)
- Misorientation (1)
- Mixed Ca-K-Na phosphates (1)
- Mixed conductors (1)
- Mixed-linkers (1)
- Mn-oxides (1)
- Mobility (1)
- Model (1)
- Moisture (1)
- Molecular Dynamics (1)
- Molten salt (1)
- Moon (1)
- Multiaxial deformation (1)
- Multilayer (1)
- Multilayer ceramic technology (1)
- Multilayers (1)
- Multiple cracks (1)
- NGS (1)
- Na and K rhenanites (1)
- Nano CRM (1)
- Nano-ceramic-additive-manufacturing photoresin (1)
- Nano-composite (1)
- Nano-scratch test (1)
- NanoCAM (1)
- Nanocomposites (1)
- Nanocrystalline alloys (1)
- Nanocrystalline structure (1)
- Nanoelectromechanical systems (NEMS) (1)
- Nanomaterials (1)
- Nanoparticle structure (1)
- Nanopowder (1)
- Nanoribbons (1)
- Nanoscale multilayers (1)
- Nanostructure quantification (1)
- Natural (1)
- Natural silver wires (1)
- Nb3Sn (1)
- Near Infrared Spectroscopy (1)
- Networking (1)
- Neutron Diffraction (1)
- NiMaGa (1)
- NiTi (1)
- Nickel-base alloy (1)
- Nitride (1)
- Non-destructive Materials (1)
- Non-metallic inclusions (1)
- Non-serrated inhomogeneous flow (1)
- Notch (1)
- Nucleation (1)
- Nucleation tendency (1)
- Number density (1)
- Nydrogen melting (1)
- Online Process Monitoring (1)
- Ontologies (1)
- Optical and Magnetic Materials (1)
- Optical centrifugation (1)
- Optical criterion of brittleness (1)
- Ordered/disordered structures (1)
- Ordering (1)
- Orientation (1)
- Orientation refinement (1)
- Orientation relationship (1)
- Osteogenesis (1)
- Oxidation protection (1)
- Oxide (1)
- Oxide coatings (1)
- Oxygen evolution reaction (1)
- PBF-LB/M/316L (1)
- PE-HD Sorption (1)
- PLS-DA (1)
- PV modules (1)
- Packaging (1)
- Parabolic flight (1)
- Parametric modeling (1)
- Particle size (1)
- Passive components and circuits (1)
- Permittivity reduction (1)
- Phase Diagram (1)
- Phase diagram (1)
- Phase field crystal (1)
- Phase field method (1)
- Phase field model (1)
- Phase separation (1)
- Phase stability (1)
- Phase transformation (1)
- Phase-Field Simulations (1)
- Phase-field model (1)
- Phase-field modelling (1)
- Phosphate (1)
- Photocleavable organosilanes (1)
- Photopolymer composites (1)
- Phototrophs (1)
- Photovoltaic modules (1)
- Physical aging (1)
- Physical properties (1)
- Phytolith (1)
- Pipeline network (1)
- Pitting corrosion (1)
- Plasma imaging (1)
- Plasma nanocoatings (1)
- Plasma spray (1)
- Platinum-group-metals (1)
- Polyaniline (1)
- Polymer analysis/characterization (1)
- Polymer composite (1)
- Polymer matrix composites (1)
- Polymer-ceramic mixtures (1)
- Polymer-matrix composites (PMC) (1)
- Polymeric Materials (1)
- Polymer–matrix composites (1)
- Polyolefins (1)
- Polypropylene (1)
- Polystyrene (1)
- Polyurethane (1)
- Porcelain (1)
- Pore (1)
- Pores (1)
- Porosification (1)
- Porous materials (1)
- Portfolio (1)
- Positron annihilation spectroscopy (1)
- Powder bed additive manufacturing (1)
- Powder bed density (1)
- Powder diffraction (1)
- Powder flow (1)
- Powder processing (1)
- Powder rheology (1)
- Powder-based processes (1)
- Powdered activated carbon (1)
- Power factor (1)
- Power law (1)
- Precipitate shape (1)
- Pressure assisted sintering (1)
- Preventive strategies (1)
- Principal stress (1)
- Principal stress components (1)
- Printing (1)
- Process (1)
- Process development (1)
- Processing window (1)
- Production scatter (1)
- Projection center (1)
- Projekt AGIL - Alterung additiv gefertigter metallischer Materialien und Komponenten (1)
- Properties (1)
- Protection (1)
- Pseudosymmetry (1)
- Pull-out composite materials (1)
- Pultruded fiber rods (1)
- Pulveraktivkohle (1)
- Quality assurance (1)
- Radon transform (1)
- Reaction Sintering (1)
- Real-time deformation (1)
- Real-time qPCR (1)
- Recommendations (1)
- Recycling (1)
- Reference data (1)
- Reference nanoparticles (1)
- Refractory alloy (1)
- Refractory high entropy alloys (1)
- Refractory superalloys (1)
- Regolith (1)
- Reheating (1)
- Rejuvenation (1)
- Relaxation fatigue (1)
- Reliability (1)
- Residual Stress (1)
- Residual strains (1)
- Residual stresses (1)
- Resistance spot welding (1)
- Resistance stress (1)
- Resonance testing (1)
- Review (1)
- Rhodonia placenta (1)
- Round Robin (1)
- S-phase (1)
- SAXS (1)
- SDC (1)
- SEM micrography (1)
- SEM wood characterization (1)
- SLM (1)
- SO2 (1)
- STEM (1)
- Safety (1)
- Safety assessment (1)
- Samarium doped ceria (1)
- Sample holder (1)
- Sand blasting (1)
- Sandwich (1)
- Scaffold (1)
- Scaffold geometry (1)
- Scaffolds (1)
- Scale-dependent behavior (1)
- Scan strategies (1)
- Scanning acoustic microscopy (SAM) (1)
- Scanning transmission electron microscopy (STEM) (1)
- Scarf joint (1)
- Scavenging effect of iron (1)
- Schadensanalyse (1)
- Schlickerdeposition (1)
- SchwarzP cells (1)
- Schwingstreifen (1)
- Schädigung (1)
- Scratches (1)
- Segregation (1)
- Segregation Engineering (1)
- Segregation engineering (1)
- Selective laser melting (SLM) (1)
- Self-Assembly (1)
- Self-organization (1)
- Semantic Web Technologies (1)
- Semantic data integration (1)
- Semantic interoperability (1)
- Semantic web (1)
- Serial sectioning (1)
- Serienschnitte (1)
- Sewage treatment plant (1)
- Shadowgraphy (1)
- Shape memory alloy (1)
- Shape memory alloys (1)
- Shear (1)
- Shear load (1)
- Shear modulus (1)
- Shear strain (1)
- Shear testing (1)
- Shear thinning (1)
- Shear-band cavitation (1)
- Shear-band structure (1)
- Short range order (1)
- Short-beam strength (1)
- Silicate glass (1)
- Silicoborate glasses (1)
- Silicon Carbide (1)
- Silicon release (1)
- Silikatkeramik (1)
- Silver metallization paste (1)
- Simulation (1)
- Single crystal Ni-Base superalloys (1)
- Single crystal superalloys (1)
- Single fiber pull-out test (1)
- Single-Crystal (1)
- Single-crystal (1)
- Sinter retardation (1)
- Sintering additive (1)
- Sinus floor augmentation (1)
- Size (1)
- Size effect (1)
- Sliding simulation (1)
- Slip localization (1)
- Slip-rolling (1)
- Slow crack growth (1)
- Slow crack growth (SCG) (1)
- Slurry (1)
- Slurry optimization (1)
- Small-angle scattering (1)
- Small-scale (1)
- Smart materials (1)
- Smectite (1)
- Soda lime silicate glass (1)
- Soda-lime silicate glass (1)
- Soda-lime-silica (1)
- Soda-lime-silica glass (1)
- Sodium ion batteries (1)
- Softening temperature (1)
- Soil (1)
- Sol-gel coating (1)
- Solar panels (1)
- Solid-State-Synthesis (1)
- Solid-state-synthesis (1)
- Space (1)
- Spar cap design (1)
- Specimen geometry (1)
- Spinodal decomposition (1)
- Split-vacancy defect complexes (1)
- Stable crack growth (1)
- Stainless steel (1)
- Standardisation (1)
- Statistics (1)
- Steam oxidation resistance (1)
- Steel P92 (1)
- Steel alloy (1)
- Stereoscopy (1)
- Strain (1)
- Strain difference (1)
- Strain energy (1)
- Stratégies deprévention (1)
- Stress distribution (1)
- Stress intensity (1)
- Stress-corrosion (1)
- Stress-strain behavior (1)
- Stress-strain-behavior (1)
- Structural composites (1)
- Structural defects (1)
- Structural dynamics (1)
- Structural health monitoring (1)
- Structural steel (1)
- Subcritical crack growth (1)
- Sulfiding (1)
- Superalloy single crystals (1)
- Supersaturation (1)
- Support configurations (1)
- Support vector machines (1)
- Surface (1)
- Surface crystallization (1)
- Surface elasticity (1)
- Surface energy (1)
- Surface modification (1)
- Surface nucleation (1)
- Surface roughness (1)
- Surface stress (1)
- Surface-induced Melting (1)
- Swept wavelength interferometry (1)
- Symmetric dwell periods (1)
- Synchrotron X-ray diffraction (1)
- Synchrotron micro-tomography (1)
- Synchrotron radiations (1)
- Synthesis (1)
- T1 precipitate (1)
- TIG-welding (1)
- Technical Ceramics (1)
- Temperature (1)
- Temperature dependence (1)
- Tensile Test Ontology (1)
- Tensile testing (1)
- Tetragonal distortion (1)
- Tetragonality (1)
- Thermal Cycling (1)
- Thermal cycling (1)
- Thermal desorption mass spectrometry (1)
- Thermo-mechanical loading (1)
- Thermo-mechanics (1)
- Thermoanalysis (1)
- Thermobimetal (1)
- Thermoelectric oxide (1)
- Thermoelectric oxides (1)
- Thermoelectrics (1)
- Thermogravimetrie (1)
- Thermogravimetry (1)
- Thermomechanical fatigue (1)
- Thermoplastic matrix (1)
- Thermoplastic prepreg (1)
- Thermoset composition (1)
- Thermosetting resin (1)
- Thickening (1)
- Thin films (1)
- Thin tribofilm (1)
- Thiol-ene click chemistry (1)
- Three-dimensional Bone tissue engineering (1)
- Three-dimensional tomographies (1)
- Titanium (1)
- Tooth wear (1)
- Topography (1)
- Toughness (1)
- Transformer (1)
- Transmission Kikuchi diffraction (1)
- Transmission electron microscope (TEM) (1)
- Transmissionselektronenmikroskopie (1)
- Transmittance (1)
- Transparency (1)
- Transparent ceramic (1)
- Tribology (1)
- Tricalcium Phosphate (1)
- Triply Periodical Minimal Surface (1)
- Tungsten carbide (1)
- Tungsten-Rhenium (1)
- Turbine disk (1)
- Twinning (1)
- Two-photon adsorption (1)
- Two-photon polymerization (1)
- Two-photon-polymerization (1)
- UV-irradiation (1)
- Ultrasonic assited machining (1)
- Ultrasound (1)
- Unidirectional composites (1)
- Utilization, and storage (CCUS) technology (1)
- Vacancies (1)
- Vickers hardness (1)
- Viscoelastic model (1)
- Viscoplasticity (1)
- Visual ontology development (1)
- Visualization (1)
- Vivianite (1)
- Vocabulary providers (1)
- Volatiles from thermosets (1)
- Volume changes (1)
- Volume fraction (1)
- WAXS (1)
- Water (1)
- Water Diffusion (1)
- Water droplet erosion resistance (1)
- Water in glass (1)
- Welding (1)
- Wet chemical etching (1)
- Whole-chain CCS scenario (1)
- Wood protection (1)
- Work of adhesion (1)
- X-ray Diffraction (1)
- X-ray computed tomography (CT) (1)
- X-ray diffraction analysis (1)
- X-ray tomographic (1)
- X-ray-diffraction (1)
- XPCS (1)
- XRD (1)
- Young's modulus (1)
- Young`s modulus (1)
- Young´s modulus (1)
- Young’s Modulus (1)
- Yttria stabilized zirconia (1)
- Zinc oxide (1)
- Zirconia-toughened alumina (1)
- ZnO (1)
- arbidic austempered ductile iron (1)
- battery aging mechanism (1)
- bioactive (1)
- biomaterials (1)
- bone (1)
- corrosion (1)
- current collector corrosion (1)
- depth profiles (1)
- electron microscopy (1)
- high entropy alloys (1)
- high pressure (1)
- hydrogen storage (1)
- in-situ synthesis (1)
- infrared spectroscopy (1)
- microstructural changes (1)
- negative crystal growth (1)
- oxidation (1)
- phosphate glasses (1)
- scanning electron microscopy (1)
- sulfidation (1)
- water speciation (1)
- µ-gravity (1)
- γ- и γ'-фазы, период кристаллической решетки (1)
- γ/γ' matrix (1)
- γ″ phase (1)
- θ′ phase (1)
- θ′-(Al2Cu) precipitate phase (1)
- высокие температуры (1)
- жаропрочные нике- левые сплавы (1)
- монокристалл (1)
- рентгеноструктурный анализ (1)
Organisationseinheit der BAM
- 5 Werkstofftechnik (389)
- 5.1 Mikrostruktur Design und Degradation (147)
- 5.4 Multimateriale Fertigungsprozesse (68)
- 5.2 Metallische Hochtemperaturwerkstoffe (63)
- 5.6 Glas (50)
- 5.5 Materialmodellierung (44)
- 5.0 Abteilungsleitung und andere (40)
- 5.3 Polymere Verbundwerkstoffe (39)
- 9 Komponentensicherheit (36)
- 8 Zerstörungsfreie Prüfung (33)
Paper des Monats
- ja (10)
The Layerwise Slurry Deposition is a technology for the deposition of highly packed powder layers. A powder bed is achieved by depositing and drying layers of a ceramic suspension by means of a doctor blade. This deposition technique was combined with the binder jetting technology to develop a novel Additive Manufacturing technology, named LSD-print. The LSD-print was applied to a porcelain ceramic. It is shown that it was possible to produce parts with high definition, good surface finish and at the same time having physical and mechanical properties close to those of traditionally processed porcelain, e.g. by slip casting.
This technology shows high future potential for being integrated alongside traditional production of porce-lain, as it is easily scalable to large areas while maintaining a good definition. Both the Layerwise Slurry Deposition method and the binder jetting technologies are readily scalable to areas as large as > 1 m2.
A shape evolution approach based on the thermally activated self-organization of 3D printed parts into minimal surface area structures is presented. With this strategy, the present communication opposes currently established additive manufacturing strategies aiming to stipulate each individual volumetric element (voxel) of a part. Instead, a 3D structure is roughly defined in a 3D printing process, with all its advantages, and an externally triggered self-organization allows the formation of structural elements with a definition greatly exceeding the volumetric resolution of the printing process. For enabling the self-organization of printed objects by viscous flow of material, functionally graded structures are printed as rigid frame and melting filler. This approach uniquely combines the freedom in design, provided by 3D printing, with the mathematical formulation of minimal surface structures and the knowledge of the physical potentials governing self-organization, to overcome the paradigm which strictly orrelates the geometrical definition of 3D printed parts to the volumetric resolution of the printing process. Moreover, a transient liquid phase allows local programming of functionalities, such as the alignment of functional particles, by means of electric or magnetic fields.
A key limitation of the most constitutive models that reproduce a Degradation of quasi-brittle materials is that they generally do not address issues related to fatigue. One reason is the huge computational costs to resolve each load cycle on the structural level. The goal of this paper is the development of a temporal Integration scheme, which significantly increases the computational efficiency of the finite element method in comparison to conventional temporal integrations.
The essential constituent of the fatigue model is an implicit gradient-enhanced formulation of the damage rate. The evolution of the field variables is computed as amultiscale Fourier series in time.On a microchronological scale attributed to single cycles, the initial boundary value problem is approximated by linear BVPs with respect to the Fourier coefficients. Using the adaptive cycle jump concept, the obtained damage rates are transferred to a coarsermacrochronological scale associated with the duration of material deterioration. The performance of the developedmethod is hence improved due to an efficient numerical treatment of the microchronological problem in combination with the cycle jump technique on the macrochronological scale. Validation examples demonstrate the convergence of the obtained solutions to the reference simulations while significantly reducing the computational costs.
Systematic microstructure design requires reliable thermodynamic descriptions of each and all microstructure elements. While such descriptions are well established for most bulk phases, thermodynamic assessment of microstructure defects is challenging because of their individualistic nature. In this paper, a model is devised for assessing grain boundary thermodynamics based on available bulk thermodynamic data. We propose a continuous relative atomic density field and its spatial gradients to describe the grain boundary region with reference to the homogeneous bulk and derive the grain boundary Gibbs free energy functional. The grain boundary segregation isotherm and phase diagram are computed for a regular binary solid solution, and qualitatively benchmarked for the Pt–Au system. The relationships between the grain boundary's atomic density, excess free volume, and misorientation angle are discussed. Combining the current density-based model with available bulk thermodynamic databases enables constructing databases, phase diagrams, and segregation isotherms for grain boundaries, opening possibilities for studying and designing heterogeneous microstructures.
Additive manufacturing of alkali-activated materials currently attracts a lot of attention, because of the possibility to produce customized high-performance elements for a range of applications, potentially being more resource-efficient than conventionally produced parts. Here, we describe a new additive manufacturing process for alkali-activated materials that is based on selective laser-heating of lithium aluminate/microsilica slurries. The new process-material combination allows to manufacture elements with complex geometries at high building rates and high accuracy. The process is versatile and transferrable to structures of sizes differing by orders of magnitude. The mechanical strength of the obtained materials was in the range of values reported for conventional metakaolin-based geopolymers, and superior to what has been hitherto reported for alkali-activated materials produced by additive manufacturing. This mechanical performance was obtained despite the fact that the degree of reaction of the lithium aluminate and the microsilica was low, suggesting that significant reactions took place only at the surface of the microsilica particles.
The amount of data generated worldwide is constantly increasing. These data come from a wide variety of sources and systems, are processed differently, have a multitude of formats, and are stored in an untraceable and unstructured manner, predominantly in natural language in data silos. This problem can be equally applied to the heterogeneous research data from materials science and engineering. In this domain, ways and solutions are increasingly being generated to smartly link material data together with their contextual information in a uniform and well-structured manner on platforms, thus making them discoverable, retrievable, and reusable for research and industry. Ontologies play a key role in this context. They enable the sustainable representation of expert knowledge and the semantically structured filling of databases with computer-processable data triples.
In this perspective article, we present the project initiative Materials-open-Laboratory (Mat-o-Lab) that aims to provide a collaborative environment for domain experts to digitize their research results and processes and make them fit for data-driven materials research and development. The overarching challenge is to generate connection points to further link data from other domains to harness the promised potential of big materials data and harvest new knowledge.
With the introduction of a mass transport mechanism the entire problem is subjected to a time frame that dictates the time-dependent action of soluted species on mechanical properties. A numerical framework within the phase-field approach is presented with an embrittlement-based coupling mechanism. The underlying functionals are expressed in terms of the displacement, mass concentration and crack phase-field. Within the phase-field approach the modelling of sharp crack discontinuities is replaced by a diffusive crack model facilitating crack initiation and complex crack topologies without the requirement of a predefined crack path. The isotropic hardening of the elasto-plastic deformation model and the local fracture criterion are affected by the species concentration. This allows for embrittlement and leads to an accelerated crack propagation. An extended mass transport equation for hydrogen embrittlement, accounting for mechanical stresses and deformations, is implemented. For stabilisation purposes a staggered scheme is applied to solve the system of partial differential equations by a multi-field finite-element method. A thermodynamically consistent coupling relation that accommodates the required mechanisms is presented.
A phenomenological criterion for an optical assessment of PE-HD fracture surfaces obtained from FNCT
(2021)
The full-notch creep test (FNCT) is a common test method to evaluate the environmental stress cracking (ESC) behavior of high-density polyethylene (PE-HD), e.g. for container materials. The test procedure as specified in ISO 16770 provides a comparative measure of the resistance against ESC using the time to failure of PE-HD specimens under constant mechanical load in a well-defined liquid test environment. Since the craze-crack damage mechanism underlying the ESC phenomenon is associated with brittle failure, the occurrence of a predominantly brittle fracture surface is a prerequisite to consider an FNCT measurement as representative for ESC, i.e. a time to failure dominated by craze-crack propagation.
The craze-crack propagation continuously reduces the effective residual cross-sectional area of the specimen during the test, which results in a corresponding increase of the effective mechanical stress. Thus, a transition to ductile shear deformation is inevitable at later stages of the test, leading usually to a pronounced central ligament.
Therefore, an optical evaluation of FNCT fracture surfaces concerning their brittleness is essential. An enhanced imaging analysis of FNCT fracture surfaces enables a detailed assessment of craze-crack Propagation during ESC. In this study, laser scanning microscopy (LSM) was employed to evaluate whether FNCT fracture surfaces are representative with respect to craze-crack propagation and ESC. Based on LSM height data, a phenomenological criterion is proposed to assess the validity of distinct FNCT measurements. This criterion is
supposed to facilitate a quick evaluation of FNCT results in practical routine testing. Its applicability is verified on a sample basis for seven different commercial PE-HD container materials.
Recently, efforts towards the development of patient-specific 3D printed scaffolds for bone tissue engineering from bioactive ceramics have continuously intensified. For reconstruction of segmental defects after subtotal mandibulectomy a suitable tissue engineered bioceramic bone graft needs to be endowed with homogenously distributed osteoblasts in order to mimic the advantageous features of vascularized autologous fibula grafts, which represent the standard of care, contain osteogenic cells and are transplanted with the respective blood vessel. Consequently, inducing vascularization early on is pivotal for bone tissue engineering. The current study explored an advanced bone tissue engineering approach combining an advanced 3D printing technique for bioactive resorbable ceramic scaffolds with a perfusion cell culture technique for pre-colonization with mesenchymal stem cells, and with an intrinsic angiogenesis technique for regenerating critical size, segmental discontinuity defects in vivo applying a rat model. To this end, the effect of differing Si-CAOP (silica containing calcium alkali orthophosphate) scaffold microarchitecture arising from 3D powder bed printing (RP) or the Schwarzwalder Somers (SSM) replica fabrication technique on vascularization and bone regeneration was analyzed in vivo. In 80 rats 6-mm segmental discontinuity defects were created in the left femur.
An improved diffusion model is proposed for pore annihilation during HIP of single-crystal nickel-base superalloys. The model assumes the pore dissolution by emission of vacancies and their sink to the low angle boundaries. Calculation, considering distribution of the pore sizes, predicts the kinetics of pore annihilation similar to the experimental one.
The precise analysis of cation diffusion profiles through corrosion scales is an important aspect to evaluate corrosion phenomena under multicomponent chemical load, as during high‐temperature corrosion under deposits and salts. The present study shows a comprehensive analysis of cation diffusion profiles by electron microprobe analysis and microbeam X‐ray absorption near edge structure (µ‐XANES) spectroscopy in mixed oxide/sulfide scales grown on Fe–Cr model alloys after exposing them to 0.5% SO2. The results presented here correspond to depth‐dependent phase identification of oxides and sulfides in the corrosion scales by µ‐XANES and the description of oxidation‐state‐dependent diffusion profiles. Scales grown on low‐ and high‐alloyed materials show both a well‐pronounced diffusion profile with a high concentration of Fe3+ at the gas and a high concentration of Fe2+ at the alloy interface. The distribution of the cations within a close‐packed oxide lattice is strongly influencing the lattice diffusion phenomena due to their different oxidation states and therefore different crystal‐field preference energies. This issue is discussed based on the results obtained by µ‐XANES analysis.
An extensive set of information about the diffracting volume is carried by EBSD patterns: the crystal lattice, the reciprocal lattice, the crystal structure, the crystal symmetry, the mean periodic number of the diffracting phase, the source point from where it has been projected (projection centre), the crystal orientation, the sample topography (local tilt), the (preparation) quality of defect density of the crystal, and possible pattern overlaps. Some of this information is used regularly in conventional EBSD analyses software while others are still waiting for a more widespread application. Despite the wealth of information available, the accuracy and precision of the data that are presently extracted from conventional EBSD patterns are often well below the actual physical limits. Using a selection of example applications, we will demonstrate the gain in angular resolution possible using relatively low-resolution patterns of approximately 20k pixels in combination with pattern matching (PM) approaches. In this way, fine details in a microstructure can be revealed which would otherwise be hidden in the orientation noise.
Carbidic Austempered Ductile Iron (CADI) microstructures containing eutectic carbides can be produced by the addition of carbide stabilizing elements, such as chromium. Carbides formed from the addition of Cr are eutectic of M3C type. The presence of such hard phases can enhance the abrasion wear resistance of ductile iron. A new CADI can be produced by the addition of Nb. Niobium carbide particles are formed in the beginning of solidification and remain stable once they are insoluble in solid iron matrix. The dry sand abrasive wear resistance of ductile irons alloyed with 1.0, 1.8, and 2.4 wt% Nb were tested in both “as-cast” and “heat treated” conditions using standard ASTM G65. Results were compared to abrasive wear data obtained on ductile iron alloyed with 1 wt% Cr, CADI (1 wt% Cr), and the basic composition of iron without carbide stabilizing elements. In the “ascast” condition, the addition of Nb did not lead to a reduction in wear, while CADI with Nb is a promising substitute for CADI with Cr addition, because both materials showed very similar values of abrasion resistance.
Micro-ploughing and micro-cutting mechanisms were observed on the worn surfaces of ductile irons. Abrasive wear resistance of these alloys was correlated with the volume fraction of carbides.
Additive manufacturing of SiSiC by layerwise slurry deposition and binder jetting (LSD-print)
(2019)
The current work presents for the first time results on the Additive Manufacturing of SiSiC complex parts based on the Layerwise Slurry Deposition (LSD) process. This technology allows to deposit highly packed powder layers by spreading a ceramic slurry and drying. The capillary forces acting during the process are responsible for the dense powder packing and the good joining between layers. The LSD process can be combined with binder jetting to print 2D cross-sections of an object in each successive layer, thus forming a 3D part. This process is named LSD-print.
By LSD-print and silicon infiltration, SiSiC parts with complex geometries and features down to 1mm and an aspect ratio up to 4:1 could be demonstrated.
The density and morphology were investigated for a large number of samples. Furthermore, the density and the mechanical properties, measured by ball-on-three-balls method, were in all three building directions close to isostatic pressed references.
The influence of the atomization technique on the suitability of granules for dry pressing is the focus of the presented investigations. Therefore, destabilized alumina, zirconia, and zirconia toughened alumina (ZTA) slurries were spray dried and the obtained granules were used to fabricate green and finally sintered bodies for evaluation.
Granules made in a laboratory spray dryer with a two-fluid nozzle served as a reference. An ultrasonic atomizer was integrated into the same spray dryer and the influence on the granule properties was evaluated. Untapped bulk density, granule size distribution, and flowability are among the evaluated granule-related properties as well as the granule yield which is used as an indicator of the process efficiency.
Yield and flowability as most important granule properties are clearly improved when atomization is realized with ultrasound. The investigated sinter body properties include porosity, sinter body density, and biaxial strength and are as well positively affected by switching the atomization technique to ultrasound. Therefore, the Approach to improve the compressibility of granules by ultrasonic atomization, which leads to an improved microstructure, density, and strength of sintered bodies, has proven to be successful for single-component ceramics (alumina and zirconia) as well as for the multicomponent ceramic ZTA.
Glasses in the systems Me2O-ZnO-B2O3 with Me = Li, Na, K, Rb (MeZB), Na2O-ZnO-CuO-B2O3 (NZCuB), CaO-ZnO-B2O3 (CaZB), and Li2O-PbO-B2O3 (LPbB) as a reference, were studied by differential thermal analysis, dilatometry, rotational viscometry, and heating microscopy. A decrease of viscosity and sintering range was found with decreasing number of fourfold coordinated boron. The viscosity of the alkali zinc borate glasses varies only slightly. LPbB and CaZB stand out by their reduced and increased viscosities, respectively. Sodium, potassium, and calcium zinc borate glasses possess a fragility above 76. All glasses were sintered to full density before crystallization. Mostly binary zinc borate phases govern crystallization. A ternary crystalline phase was detected only in the potassium containing sample. The Weinberg glass stability parameter ranges between 0.07 and 0.12. This is caused by the presence of several crystalline phases and varying melting points of even the same crystalline phase in different glass matrices.
Low melting Li2O-PbO-B2O3, Me2O-ZnO-B2O3, Me = Li, Na, K, Rb and CaO-ZnO-B2O3 glasses were studied with Raman and infrared spectroscopies to advance the structural understanding of zinc borate glasses as potential candidates for substitution of lead containing glasses. Although the effect of type of alkali ions on the number (N4) of fourfold coordinated boron (B4) in the glasses is small, the alkali ions direct the type of borate groups, i.e., pentaborate in lithium, sodium, and calcium zinc borate glasses, as well as diborate in potassium and rubidium containing ones. Both groups were simultaneously found in Li2O-PbO-B2O3. Alkali ions are mainly responsible for the formation of B4-units and metaborate. Zinc ions favorably compensate non-bridging oxygen and partially form ZnO4. With decreasing N4 and field strength of the alkali ions the atomic packing density, glass transition temper ature and Young’s Modulus also decrease. The coefficient of thermal expansion increases with decreasing N4.
A gray cast iron disc, which had been submitted to a heavy duty automotive brake test, was examined with energy filtered transmission electron microscopy. A graphite flake in a convenient angular position showed the shear interaction of graphite layers with the iron matrix in nano-scale resolution. Atomic layers of graphite were wedged into the ferritic bulk, allowing the entrance of oxygen and the subsequent formation of magnetite. The exfoliated few-layer graphene batches deformed heavily when forced into the matrix. When Raman spectra from the disc surface, which show distinctive carbonaceous bands, were compared with Raman spectra from graphite subjected to deformation in a shaker mill with different milling times, it could be seen that the shear stress on the brake surface was much more effective to induce disorder than the milling, where compressive and impact forces had been additionally exerted on the sample. During shear load the high anisotropy of elastic modulus in the graphite crystalline structure and the low adhesion between graphite basal planes allowed the exfoliation of wrinkled few-layer grapheme batches, causing the formation of more defect related Raman bands than the mechanical stress during high-energy milling.