@inproceedings{RackelStarkGabrischetal., author = {Rackel, Marcus W. and Stark, Andreas and Gabrisch, Heike and Schimansky, Frank-Peter and Schell, Norbert and Schreyer, Andreas and Pyczak, Florian}, title = {In situ synchrotron radiation measurements of orthorhombic phase formation in an advanced TiAl alloy with modulated microstructure}, series = {Advanced structural and functional intermetallic-based alloys, November 30 - December 5, 2014, Boston, Massachusetts, USA}, booktitle = {Advanced structural and functional intermetallic-based alloys, November 30 - December 5, 2014, Boston, Massachusetts, USA}, publisher = {Curran}, address = {Red Hook, NY}, isbn = {978-1-5108-0634-4}, pages = {120 -- 126}, language = {en} } @misc{WangGabrischLorenzetal., author = {Wang, Li and Gabrisch, Heike and Lorenz, Uwe and Schimansky, Frank-Peter and Schreyer, Andreas and Stark, Andreas and Pyczak, Florian}, title = {Nucleation and thermal stability of carbide precipitates in high Nb containing TiAl alloys}, series = {Intermetallics}, volume = {66}, journal = {Intermetallics}, issn = {0966-9795}, doi = {10.1016/j.intermet.2015.07.001}, pages = {111 -- 119}, language = {en} } @misc{StarkRackelTchouahaTankouaetal., author = {Stark, Andreas and Rackel, Marcus W. and Tchouaha Tankoua, Aristide and Oehring, Michael and Schell, Norbert and Lottermoser, Lars and Schreyer, Andreas and Pyczak, Florian}, title = {In situ High-Energy X-Ray Diffraction during Hot-Forming of a Multiphase TiAl Alloy}, series = {Metals}, volume = {5}, journal = {Metals}, number = {4}, issn = {2075-4701}, pages = {2252 -- 2265}, language = {en} } @inproceedings{PyczakRackelGabrischetal., author = {Pyczak, Florian and Rackel, Marcus W. and Gabrisch, Heike and Halici, Dalic and Lorenz, Uwe and Schreyer, Andreas and Stark, Andreas}, title = {In-situ monitoring of thermal treatments and hot deformation of a y-TiAl alloy by high energy X-ray diffraction}, series = {Proceedings of the 1st International Conference on Advanced High-Temperature Materials Technology for Sustainable and Reliable Power Engineering (123HiMAT-2015), June 29 - July 3, 2015, Sapporo, Japan}, booktitle = {Proceedings of the 1st International Conference on Advanced High-Temperature Materials Technology for Sustainable and Reliable Power Engineering (123HiMAT-2015), June 29 - July 3, 2015, Sapporo, Japan}, publisher = {The 123rd Committee of Japan Society for the Promotion of Science, IAI}, address = {Tokyo}, isbn = {978-4-9908874-0-7}, pages = {323 -- 326}, language = {en} } @misc{RackelStarkGabrischetal., author = {Rackel, Marcus W. and Stark, Andreas and Gabrisch, Heike and Schell, Norbert and Schreyer, Andreas and Pyczak, Florian}, title = {Orthorhombic phase formation in a Nb-rich γ-TiAl based alloy - an in situ synchrotron radiation investigation}, series = {Acta Materialia}, volume = {121}, journal = {Acta Materialia}, issn = {1359-6454}, doi = {10.1016/j.actamat.2016.09.030}, pages = {343 -- 351}, language = {en} } @misc{LaippleStarkSchimanskyetal., author = {Laipple, Daniel and Stark, Andreas and Schimansky, Frank-Peter and Schwebke, Bernd and Pyczak, Florian and Schreyer, Andreas}, title = {Microstructure of Ti-45Al-5Nb and Ti-45Al-10Nb powders}, series = {Key Engineering Materials}, volume = {704}, journal = {Key Engineering Materials}, issn = {1662-9795}, doi = {10.4028/www.scientific.net/KEM.704.214}, pages = {214 -- 222}, language = {en} } @misc{FreundStarkKirchmayeretal., author = {Freund, Lisa P. and Stark, Andreas and Kirchmayer, Andreas and Schell, Norbert and Pyczak, Florian and G{\"o}ken, Mathias and Neumeier, Steffen}, title = {The Effect of a Grain Boundary Pinning B2 Phase on Polycrystalline Co-Based Superalloys with Reduced Density}, series = {Metallurgical and Materials Transactions A}, volume = {49}, journal = {Metallurgical and Materials Transactions A}, number = {9}, issn = {1543-1940}, doi = {10.1007/s11661-018-4757-2}, pages = {4070 -- 4078}, 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} } @misc{SchlofferIqbalGabrischetal., author = {Schloffer, Martin and Iqbal, Farasat and Gabrisch, Heike and Schwaighofer, Emanuel and Schimansky, Frank-Peter and Mayer, Svea and Stark, Andreas and Lippmann, Thomas and G{\"o}ken, Mathias and Pyczak, Florian and Clemens, Helmut}, title = {Microstructure development and hardness of a powder metallurgical multi phase gamma-TiAl based alloy}, series = {Intermetallics}, journal = {Intermetallics}, number = {22}, issn = {0966-9795}, doi = {10.1016/j.intermet.2011.11.015}, pages = {231 -- 240}, language = {en} } @inproceedings{HauschildtStarkLorenzetal., author = {Hauschildt, Katja and Stark, Andreas and Lorenz, Uwe and Schell, Norbert and Fischer, Torben and Blankenburg, Malte and M{\"u}ller, Martin and Pyczak, Florian}, title = {Diffusion brazing of γ-TiAl-alloys: Investigations of the joint by electron microscopy and high-energy X-ray diffraction}, 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.2012.1750}, pages = {215 -- 220}, language = {en} }