@misc{DinkelHeinzPyczaketal., author = {Dinkel, Michael and Heinz, Paul and Pyczak, Florian and Volek, Andreas and Ott, Michael and Affeldt, Ernst and Vossberg, Andreas and G{\"o}ken, Mathias and Singer, Robert F.}, title = {New Boron and Silicon Free Single Crystal-Diffusion Brazing Alloys}, series = {Superalloys 2008, proceedings of the Eleventh International Symposium on Superalloys, held September 14 - 18, 2008, Pennsylvania, USA}, journal = {Superalloys 2008, proceedings of the Eleventh International Symposium on Superalloys, held September 14 - 18, 2008, Pennsylvania, USA}, editor = {Reed, Roger C. and Green, Kenneth A. and Caron, Pierre and Gabb, Timothy P. and Fahrmann, Michael G. and Huron, Eric S. and Woodard, Shiela R.}, publisher = {TMS}, address = {Warrendale, Pa.}, isbn = {978-0-87339-728-5}, pages = {211 -- 220}, language = {en} } @inproceedings{HeinzVolekSingeretal., author = {Heinz, Paul and Volek, Andreas and Singer, Robert F. and Dinkel, Michael and Pyczak, Florian and G{\"o}ken, Mathias and Ott, Michael and Affeldt, Ernst and Vossberg, Andreas}, title = {Diffusion brazing of single crystalline nickel base superalloys using boron free nickel base braze alloys}, series = {Diffusion in Solids and Liquids III, 3rd International Conference on Diffusion in Solids and Liquids, Liege Konferenz}, booktitle = {Diffusion in Solids and Liquids III, 3rd International Conference on Diffusion in Solids and Liquids, Liege Konferenz}, editor = {{\"O}chsner, Andreas and Murch, Graeme E.}, publisher = {Trans Tech Publ.}, address = {Stafa-Zurich [u.a.]}, isbn = {978-3-908451-51-8}, pages = {294 -- 299}, language = {en} } @inproceedings{DinkelPyczakGoekenetal., author = {Dinkel, Michael and Pyczak, Florian and G{\"o}ken, Mathias and Heinz, Paul and Volek, Andreas and Singer, Robert F. and Ott, Michael and Affeldt, Ernst and Vossberg, Andreas}, title = {Nanoindentation and Orientation Measurements in Single Crystalline Brazing Joints of Nickel-Base Superalloys}, series = {Materials for advanced power engineering 2006, proceedings of the 8th Liege Conference, Bd. 2}, booktitle = {Materials for advanced power engineering 2006, proceedings of the 8th Liege Conference, Bd. 2}, editor = {Lecomte-Beckers, Jacqueline and Carton, M. and Schubert, F. and Ennis, P. J.}, publisher = {Forschungszentrum}, address = {J{\"u}lich}, isbn = {3-89336-436-6}, pages = {633 -- 642}, language = {en} } @misc{BolzOehringLindemannetal., author = {Bolz, Sebastian and Oehring, Michael and Lindemann, Janny and Pyczak, Florian and Paul, Jonathan and Stark, Andreas and Lippmann, Thomas and Roth-Fagaraseanu, Dan and Schreyer, Andreas and Weiß, Sabine and Schr{\"u}fer, Susanne}, title = {Microstructure and mechanical properties of a forged beta-solidifying gamma TiAl alloy in different heat treatment conditions}, series = {Intermetallics}, volume = {2015}, journal = {Intermetallics}, number = {58}, pages = {71 -- 83}, language = {en} } @misc{OehringLindemannPyczaketal., author = {Oehring, Michael and Lindemann, Janny and Pyczak, Florian and Paul, Jonathan and Stark, Andreas and Lippmann, Thomas and Schr{\"u}fer, Susanne and Roth-Fagaraseanu, Dan and Schreyer, Andreas and Weiß, Sabine}, title = {Microstructure and mechanical properties of a forged β-solidifying γ TiAl alloy in different heat treatment conditions}, series = {Intermetallics}, volume = {2015}, journal = {Intermetallics}, number = {58}, issn = {0966-9795}, doi = {10.1016/j.intermet.2014.11.008}, pages = {71 -- 83}, abstract = {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.}, language = {en} } @misc{LiangPaulStarketal., author = {Liang, Zhida and Paul, Jonathan and Stark, Andreas and Bezold, Andreas and Neumeier, Steffen and G{\"o}ken, Mathias and Pyczak, Florian}, title = {High-Temperature CoNi-Based Superalloys Strengthened by γ′-(Ni,Co)3(Cr,Al,Ti,X): The Effect of Refractory Elements}, series = {Metallurgical and materials transactions. A, Physical metallurgy and materials science}, volume = {54 (2023)}, journal = {Metallurgical and materials transactions. A, Physical metallurgy and materials science}, number = {5}, issn = {1543-1940}, doi = {10.1007/s11661-022-06795-y}, pages = {1620 -- 1634}, abstract = {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.}, language = {en} } @misc{OehringStarkPauletal., author = {Oehring, Michael and Stark, Andreas and Paul, Jonathan David Heaton and Lippmann, Thomas and Pyczak, Florian}, title = {Microstructural refinement of boron-containing β-solidifying γ-titanium aluminide alloys through heat treatments in the β phase field}, series = {Intermetallics}, journal = {Intermetallics}, number = {32}, isbn = {0966-9795}, pages = {12 -- 20}, language = {en} } @inproceedings{GabrischLorenzOehringetal., author = {Gabrisch, Heike and Lorenz, Uwe and Oehring, Michael and Paul, Jonathan and Pyczak, Florian and Rackel, Marcus W. and Schimansky, Frank-Peter and Stark, Andreas}, title = {TiAlNb-alloy with a modulated B19 containing constituent produced by powder metallurgy}, series = {Intermetallic-based alloys - science, technology and applications, symposium held November 25-30, Boston, Massachusetts, U.S.A}, booktitle = {Intermetallic-based alloys - science, technology and applications, symposium held November 25-30, Boston, Massachusetts, U.S.A}, publisher = {Cambridge Univ. Press}, address = {Cambridge}, doi = {10.1557/opl.2012.1575}, pages = {35 -- 40}, language = {en} } @misc{PyczakBauerGoekenetal., author = {Pyczak, Florian and Bauer, Alexander and G{\"o}ken, Mathias and Lorenz, Uwe and Neumeier, Steffen and Oehring, Michael and Paul, Jonathan and Schell, Norbert and Schreyer, Andreas and Symanzik, Felix}, title = {The effect of tungsten content on the properties of L12-hardened Co-Al-W alloys}, series = {Journal of Alloys and Compounds}, journal = {Journal of Alloys and Compounds}, number = {632}, issn = {0925-8388}, pages = {110 -- 115}, language = {en} } @misc{LazurenkoStarkEsikovetal., author = {Lazurenko, Daria V. and Stark, Andreas and Esikov, Maksim A. and Paul, Jonathan and Bataev, Ivan A. and Kashimbetova, Adelya A. and Mali, Vyacheslav I. and Lorenz, Uwe and Pyczak, Florian}, title = {Ceramic-Reinforced γ-TiAl-Based Composites: Synthesis, Structure, and Properties}, series = {Materials}, volume = {12}, journal = {Materials}, number = {4}, issn = {1996-1944}, doi = {10.3390/ma12040629}, pages = {20}, language = {en} } @misc{LiPyczakStarketal., author = {Li, Yuzhi and Pyczak, Florian and Stark, Andreas and Wang, Li and Oehring, Michael and Paul, Jonathan and Lorenz, Uwe}, title = {Temperature dependence of misfit in different Co-Al-W ternary alloys measured by synchrotron X-ray diffraction}, series = {Journal of Alloys and Compounds}, volume = {819}, journal = {Journal of Alloys and Compounds}, issn = {0925-8388}, pages = {9}, language = {en} } @misc{LazurenkoLaptevGolkovskyetal., author = {Lazurenko, Daria V. and Laptev, Ilia S. and Golkovsky, Mikhail G. and Stark, Andreas and Paul, Jonathan and Bataev, Ivan A. and Ruktuev, Alexey A. and Song, Lin and Gollwitzer, Christian and Pyczak, Florian}, title = {Influence of the Ti/Al/Nb ratio on the structure and properties on intermetallic layers obtained on titanium by non-vacuum electron beam cladding}, series = {Materials Characterization}, volume = {163}, journal = {Materials Characterization}, issn = {1044-5803}, pages = {13}, language = {en} } @misc{FroebelStarkPauletal., author = {Fr{\"o}bel, Ulrich and Stark, Andreas and Paul, Jonathan and Pyczak, Florian}, title = {Assessment of the capability of Zr, Y, La, Gd, Dy, C, and Si to enhance the creep strength of gamma titanium aluminide alloys based on their effect on flow stress and thermal activation parameters}, series = {Intermetallics}, volume = {Vol. 162}, journal = {Intermetallics}, issn = {1879-0216}, doi = {10.1016/j.intermet.2023.108018}, language = {en} }