TY - GEN A1 - Dinkel, Michael A1 - Heinz, Paul A1 - Pyczak, Florian A1 - Volek, Andreas A1 - Ott, Michael A1 - Affeldt, Ernst A1 - Vossberg, Andreas A1 - Göken, Mathias A1 - Singer, Robert F. ED - Reed, Roger C. ED - Green, Kenneth A. ED - Caron, Pierre ED - Gabb, Timothy P. ED - Fahrmann, Michael G. ED - Huron, Eric S. ED - Woodard, Shiela R. T1 - New Boron and Silicon Free Single Crystal-Diffusion Brazing Alloys T2 - Superalloys 2008, proceedings of the Eleventh International Symposium on Superalloys, held September 14 - 18, 2008, Pennsylvania, USA Y1 - 2008 SN - 978-0-87339-728-5 SP - 211 EP - 220 PB - TMS CY - Warrendale, Pa. ER - TY - CHAP A1 - Heinz, Paul A1 - Volek, Andreas A1 - Singer, Robert F. A1 - Dinkel, Michael A1 - Pyczak, Florian A1 - Göken, Mathias A1 - Ott, Michael A1 - Affeldt, Ernst A1 - Vossberg, Andreas ED - Öchsner, Andreas ED - Murch, Graeme E. T1 - Diffusion brazing of single crystalline nickel base superalloys using boron free nickel base braze alloys T2 - Diffusion in Solids and Liquids III, 3rd International Conference on Diffusion in Solids and Liquids, Liege Konferenz Y1 - 2008 SN - 978-3-908451-51-8 SP - 294 EP - 299 PB - Trans Tech Publ. CY - Stafa-Zurich [u.a.] ER - TY - CHAP A1 - Dinkel, Michael A1 - Pyczak, Florian A1 - Göken, Mathias A1 - Heinz, Paul A1 - Volek, Andreas A1 - Singer, Robert F. A1 - Ott, Michael A1 - Affeldt, Ernst A1 - Vossberg, Andreas ED - Lecomte-Beckers, Jacqueline ED - Carton, M. ED - Schubert, F. ED - Ennis, P. J. T1 - Nanoindentation and Orientation Measurements in Single Crystalline Brazing Joints of Nickel-Base Superalloys T2 - Materials for advanced power engineering 2006, proceedings of the 8th Liege Conference, Bd. 2 Y1 - 2006 SN - 3-89336-436-6 SP - 633 EP - 642 PB - Forschungszentrum CY - Jülich ER - TY - GEN A1 - Bolz, Sebastian A1 - Oehring, Michael A1 - Lindemann, Janny A1 - Pyczak, Florian A1 - Paul, Jonathan A1 - Stark, Andreas A1 - Lippmann, Thomas A1 - Roth-Fagaraseanu, Dan A1 - Schreyer, Andreas A1 - Weiß, Sabine A1 - Schrüfer, Susanne T1 - Microstructure and mechanical properties of a forged beta-solidifying gamma TiAl alloy in different heat treatment conditions T2 - Intermetallics Y1 - 2015 VL - 2015 IS - 58 SP - 71 EP - 83 ER - TY - GEN A1 - Oehring, Michael A1 - Lindemann, Janny A1 - Pyczak, Florian A1 - Paul, Jonathan A1 - Stark, Andreas A1 - Lippmann, Thomas A1 - Schrüfer, Susanne A1 - Roth-Fagaraseanu, Dan A1 - Schreyer, Andreas A1 - Weiß, Sabine T1 - Microstructure and mechanical properties of a forged β-solidifying γ TiAl alloy in different heat treatment conditions T2 - Intermetallics N2 - In the cast condition g titanium aluminide alloys that solidify completely through the b phase are characterized by fine and homogeneous microstructures, weak textures and low segregation. For these reasons such alloys have a relatively good workability and can be closed-die forged without preceding ingot breakdown even if the alloys contain no large fractions of the b phase at the working temperature. The present work was devoted to a combined study of the constitution and microstructural morphologies that develop in various two-step heat treatments of a single-step forged b solidifying alloy. The study included high-energy X-ray diffraction for in situ investigations of the constitution at the heat treatment temperature. It was observed that the phase ransformations are quite sluggish in the material which results in fine microstructures and some conditions that significantly deviate from thermodynamic equilibrium. Further, tensile and creep testing was carried out on the different material conditions in order to identify the range in which the properties can be varied. It is found that this easily forgeable material exhibits comparable strength, ductility and creep strength as more conventional peritectically solidifying alloys. KW - TiAl KW - Titanium Aluminides KW - hot die forging KW - TNB-V4 Y1 - 2015 UR - http://www.sciencedirect.com/science/article/pii/S096697951400301X U6 - https://doi.org/10.1016/j.intermet.2014.11.008 SN - 0966-9795 VL - 2015 IS - 58 SP - 71 EP - 83 ER - TY - GEN A1 - Liang, Zhida A1 - Paul, Jonathan A1 - Stark, Andreas A1 - Bezold, Andreas A1 - Neumeier, Steffen A1 - Göken, Mathias A1 - Pyczak, Florian T1 - High-Temperature CoNi-Based Superalloys Strengthened by γ′-(Ni,Co)3(Cr,Al,Ti,X): The Effect of Refractory Elements T2 - Metallurgical and materials transactions. A, Physical metallurgy and materials science N2 - Recent research on Co-based and CoNi-based alloys revealed that the Co–Al–W-system provides interesting properties, however, the high content of W addition triggers high mass density of alloys which limits its industrial application. Therefore, new high temperature superalloys based on the Co–Ni–Al–Ti-system with high content Cr and strengthened by γ′-(Ni,Co)3(Cr,Al,Ti) precipitates, have been developed, and the effect of different refractory element additions was investigated. STEM-EDS and HEXRD were employed to determine the elemental partitioning behavior and the lattice misfit between the γ and γ′ phases. Ta and Nb strongly concentrate within the γ′ phase, whereas Mo weakly partitions to the γ phase. W distributes equally between the γ and γ′ phases. These new superalloys have an unexpectedly high positive misfit compared with some conventional Ni-based superalloys and Co-based superalloys. Nb and Ta additions increase the lattice misfit further, while Mo and W decrease the lattice misfit. The effect of refractory elements alloying on the yield stress at room temperature was evaluated by analyzing the contributions of different strengthening mechanisms. Alloying with Nb or Ta significantly improves precipitation strengthening by increasing the antiphase boundary energy. Mo has the highest solid solution strengthening effect in the γ phase, followed by W. Compared with some conventional Ni-based superalloys, the investigated new CoNi-based superalloys exhibited better mechanical properties at high temperature, which indicates that these compositionally complex alloys are possible candidates for high temperature applications. Y1 - 2022 U6 - https://doi.org/10.1007/s11661-022-06795-y SN - 1543-1940 VL - 54 (2023) IS - 5 SP - 1620 EP - 1634 ER - TY - GEN A1 - Kao, Ming-Chao A1 - Schewe, Lukas Paul A1 - Akhtar, Arub A1 - Rehm, Jana A1 - Bin Anooz, Saud Bin A1 - Galazka, Zbigniew A1 - Popp, Andreas A1 - Flege, Jan Ingo A1 - Vonk, Vedran A1 - Stierle, Andreas T1 - Structure and Stability of Al-alloyed β-Ga2O3(100) surfaces T2 - Verhandlungen der DPG, Berlin 2024 N2 - β-Ga2O3 (GaO) holds great promise in high-power applications. GaO is predicted to outperform the leading technologies based on SiC and GaN due to a three times higher calculated critical field strength. It has been identified that alloying with Al results in an almost linear increase in the bandgap between Ga2O3 (4.85eV) and Al2O3 (7eV). A critical issue in the bandgap engineering of GaO is maintaining reasonable electron mobility, which is low for the pure material (150cm2/V/S). This project aims to explore GaO by Al alloying, which allows tunable wide bandgaps for engineering material properties and at the same time maintains excellent crystal quality. PXRD and their Rietveld refinement on several AlGaO crystals indicate a preferential ordering of Al and Ga over octahedral and tetrahedral sites. The results of an SXRD study using synchrotron radiation addressing the surface structure of β-AlxGa2−xO3(100) substrates with x=0−0.25. Our results indicate that the GaO(100) surface is nearly bulk terminated and remains smooth up to 800°C and 10−5mbar of molecular oxygen. KW - high-power applications KW - bandgap engineering KW - crystal quality KW - X-ray diffraction Y1 - 2024 UR - https://www.dpg-verhandlungen.de/year/2024/conference/berlin/part/o/session/67/contribution/10 SN - 0420-0195 PB - Deutsche Physikalische Gesellschaft CY - Bad Honnef ER - TY - GEN A1 - Kao, Ming-Chao A1 - Schewe, Lukas Paul A1 - Akhtar, Arub A1 - Vlad, Alina A1 - Keller, Thomas F. A1 - Henkel, Karsten A1 - Anooz, Saud Bin A1 - Popp, Andreas A1 - Galazka, Zbigniew A1 - Flege, Jan Ingo A1 - Stierle, Andreas A1 - Vonk, Vedran T1 - Surface termination of β-Ga₂O₃(100) as-cleaved single crystals T2 - Applied physics letters N2 - The surface of β-Ga₂O₃ single crystals cleaved along their (100) plane is investigated using surface x-ray diffraction and atomic force microscopy. The results show the surface to consist of a single, so-called B-termination, which means that the crystal cleaves at planes formed by edge-sharing oxygen octahedra, thereby breaking the longest and weakest Ga–O bonds. Refinement of the atomic positions results in small displacements from the bulk structure, at most approximately 0.01 Å. Atomic force microscopy suggests that relatively large terraces form together with steps of half the a-axis length of approximately 0.6 nm, which means that terraces have the same atomic termination, related by the crystal symmetry. These results are important as a fundamental property of β-Ga₂O₃ when processed or used in various semiconductor applications. KW - X-ray KW - Gallium oxide Y1 - 2026 U6 - https://doi.org/10.1063/5.0309937 SN - 0003-6951 VL - 128 IS - 7 SP - 1 EP - 5 PB - AIP Publishing CY - Melville, NY ER - TY - GEN A1 - Ho, Paul S. A1 - Zschech, Ehrenfried A1 - Schmeißer, Dieter A1 - Meyer, Moritz Andreas A1 - Huebner, Rene A1 - Hauschildt, Meike A1 - Zhang, Lijuan A1 - Gall, Martin A1 - Kraatz, Matthias T1 - Scaling effects on microstructure and reliability for cu interconnects KW - scaling KW - microstructure KW - interconnects Y1 - 2010 ER - TY - GEN A1 - Mauß, Fabian A1 - Nakov, Galin A1 - Wenzel, Paul A1 - Steiner, Rüdiger A1 - Krüger, Christian A1 - Zhang, Yongzeh A1 - Rawat, Rajesh A1 - Borg, Andreas A1 - Perlman, Cathleen A1 - Fröjd, Karin A1 - Lehtiniemi, Harry T1 - Soot Simulation under Diesel Engine Conditions Using a Flamelet Approach T2 - SAE International Journal of Engines Y1 - 2010 SN - 1946-3936 VL - 2 IS - 2 SP - 89 EP - 104 ER - TY - CHAP A1 - Christl, Andreas A1 - Gorenz, Paul A1 - Herzog, Nicoleta A1 - Egbers, Christoph T1 - Eccentric Taylor-Couette Flow with orbital motion of the inner cylinder Y1 - 2011 ER - TY - CHAP A1 - Paul, Andreas ED - Stewin, Patrick ED - Mulliner, Collin T1 - Verwundbarkeitsanalyse des Industrial-Ethernet Protokolls Profinet IO T2 - Proceedings of the Seventh GI SIG SIDAR Graduate Workshop on Reactive Security (SPRING) Y1 - 2012 UR - http://www.sec.t-labs.tu-berlin.de/spring/Program.html N1 - Technical Report SR-2012-01 PB - GI FG SIDAR CY - Berlin ER -