TY - CHAP A1 - Stark, Andreas A1 - Schwaighofer, Emanuel A1 - Mayer, Svea A1 - Clemens, Helmut A1 - Lippmann, Thomas A1 - Lottermoser, Lars A1 - Schreyer, Andreas A1 - Pyczak, Florian T1 - In situ high-energy XRD study of the hot-deformation behavior of a novel γ-TiAl alloy T2 - Intermetallic-based alloys - science, technology and applications, symposium held November 25-30, Boston, Massachusetts, U.S.A Y1 - 2013 U6 - https://doi.org/10.1557/opl.2012.1577 SP - 35 EP - 40 PB - Cambridge Univ. Press CY - Cambridge ER - TY - GEN A1 - Pyczak, Florian A1 - Bauer, A. A1 - Göken, Mathias A1 - Neumeier, Steffen A1 - Lorenz, U. A1 - Oehring, Michael A1 - Schell, N. A1 - Schreyer, Andreas A1 - Stark, Andreas A1 - Szymanzik, F. T1 - Plastic Deformation Mechanisms in a Crept L12 hardened Co-Base Superalloy T2 - Materials Science and Engineering A Y1 - 2013 SN - 1873-4936 IS - 571 SP - 13 EP - 18 ER - TY - GEN A1 - Stark, Andreas A1 - Oehring, Michael A1 - Pyczak, Florian A1 - Lippmann, Thomas A1 - Lottermoser, Lars A1 - Schreyer, Andreas T1 - The transformation mechanism of β phase to ω-related phases in Nb-rich γ-TiAl alloys studied by in situ high-energy X-ray diffraction T2 - Materials Science Forum Y1 - 2014 SN - 1662-9752 IS - 772 SP - 85 EP - 89 ER - TY - GEN A1 - Staron, Peter A1 - Beckmann, Felix A1 - Lippmann, Thomas A1 - Stark, Andreas A1 - Oehring, Michael A1 - Pyczak, Florian A1 - Salgado, Mario A1 - Hort, Norbert A1 - Eckerlebe, Horst A1 - Kainer, Karl Ulrich A1 - Müller, Martin A1 - Schreyer, Andreas T1 - In situ studies of light metals with synchrotron radiation and neutrons T2 - Materials Science Forum Y1 - 2011 SN - 1662-9752 IS - 690 SP - 192 EP - 197 ER - TY - GEN A1 - Stark, Andreas A1 - Oehring, Michael A1 - Pyczak, Florian A1 - Schreyer, Andreas T1 - In Situ Observation of Various Phase Transformation Paths in Nb-Rich TiAl Alloys during Quenching with Different Rates T2 - Advanced Engineering Materials Y1 - 2011 SN - 1527-2648 VL - 18 IS - 8 SP - 700 EP - 704 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 - CHAP A1 - Wang, Li A1 - Pyczak, Florian A1 - Gabrisch, Heike A1 - Lorenz, Uwe A1 - Münch, Mathias A1 - Schimansky, Frank-Peter A1 - Schreyer, Andreas A1 - Stark, Andreas T1 - Effects of Carbon Content, Annealing Condition and Internal Defects on the nucleation, growth and coarsening of P-type Carbides in High Niobium Containing TiAl Alloys T2 - Advanced structural and functional intermetallic-based alloys, November 30 - December 5, 2014, Boston, Massachusetts, USA Y1 - 2015 SN - 978-1-5108-0634-4 SP - 61 EP - 66 PB - Curran CY - Red Hook, NY ER - TY - CHAP A1 - Rackel, Marcus W. A1 - Stark, Andreas A1 - Gabrisch, Heike A1 - Schimansky, Frank-Peter A1 - Schell, Norbert A1 - Schreyer, Andreas A1 - Pyczak, Florian T1 - In situ synchrotron radiation measurements of orthorhombic phase formation in an advanced TiAl alloy with modulated microstructure T2 - Advanced structural and functional intermetallic-based alloys, November 30 - December 5, 2014, Boston, Massachusetts, USA Y1 - 2015 SN - 978-1-5108-0634-4 SP - 120 EP - 126 PB - Curran CY - Red Hook, NY ER - TY - GEN A1 - Wang, Li A1 - Gabrisch, Heike A1 - Lorenz, Uwe A1 - Schimansky, Frank-Peter A1 - Schreyer, Andreas A1 - Stark, Andreas A1 - Pyczak, Florian T1 - Nucleation and thermal stability of carbide precipitates in high Nb containing TiAl alloys T2 - Intermetallics Y1 - 2015 U6 - https://doi.org/10.1016/j.intermet.2015.07.001 SN - 0966-9795 VL - 66 SP - 111 EP - 119 ER - TY - GEN A1 - Stark, Andreas A1 - Rackel, Marcus W. A1 - Tchouaha Tankoua, Aristide A1 - Oehring, Michael A1 - Schell, Norbert A1 - Lottermoser, Lars A1 - Schreyer, Andreas A1 - Pyczak, Florian T1 - In situ High-Energy X-Ray Diffraction during Hot-Forming of a Multiphase TiAl Alloy T2 - Metals Y1 - 2015 SN - 2075-4701 VL - 5 IS - 4 SP - 2252 EP - 2265 ER - TY - CHAP A1 - Pyczak, Florian A1 - Rackel, Marcus W. A1 - Gabrisch, Heike A1 - Halici, Dalic A1 - Lorenz, Uwe A1 - Schreyer, Andreas A1 - Stark, Andreas T1 - In-situ monitoring of thermal treatments and hot deformation of a y-TiAl alloy by high energy X-ray diffraction T2 - 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 Y1 - 2015 SN - 978-4-9908874-0-7 SP - 323 EP - 326 PB - The 123rd Committee of Japan Society for the Promotion of Science, IAI CY - Tokyo ER - TY - GEN A1 - Rackel, Marcus W. A1 - Stark, Andreas A1 - Gabrisch, Heike A1 - Schell, Norbert A1 - Schreyer, Andreas A1 - Pyczak, Florian T1 - Orthorhombic phase formation in a Nb-rich γ-TiAl based alloy – an in situ synchrotron radiation investigation T2 - Acta Materialia Y1 - 2016 U6 - https://doi.org/10.1016/j.actamat.2016.09.030 SN - 1359-6454 VL - 121 SP - 343 EP - 351 ER - TY - GEN A1 - Laipple, Daniel A1 - Stark, Andreas A1 - Schimansky, Frank-Peter A1 - Schwebke, Bernd A1 - Pyczak, Florian A1 - Schreyer, Andreas T1 - Microstructure of Ti-45Al-5Nb and Ti-45Al-10Nb powders T2 - Key Engineering Materials Y1 - 2016 U6 - https://doi.org/10.4028/www.scientific.net/KEM.704.214 SN - 1662-9795 VL - 704 SP - 214 EP - 222 ER - TY - GEN A1 - Freund, Lisa P. A1 - Stark, Andreas A1 - Kirchmayer, Andreas A1 - Schell, Norbert A1 - Pyczak, Florian A1 - Göken, Mathias A1 - Neumeier, Steffen T1 - The Effect of a Grain Boundary Pinning B2 Phase on Polycrystalline Co-Based Superalloys with Reduced Density T2 - Metallurgical and Materials Transactions A Y1 - 2018 U6 - https://doi.org/10.1007/s11661-018-4757-2 SN - 1543-1940 SN - 1073-5623 VL - 49 IS - 9 SP - 4070 EP - 4078 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 - Oehring, Michael A1 - Stark, Andreas A1 - Paul, Jonathan David Heaton A1 - Lippmann, Thomas A1 - Pyczak, Florian T1 - Microstructural refinement of boron-containing β-solidifying γ-titanium aluminide alloys through heat treatments in the β phase field T2 - Intermetallics Y1 - 2012 SN - 0966-9795 IS - 32 SP - 12 EP - 20 ER - TY - GEN A1 - Schloffer, Martin A1 - Iqbal, Farasat A1 - Gabrisch, Heike A1 - Schwaighofer, Emanuel A1 - Schimansky, Frank-Peter A1 - Mayer, Svea A1 - Stark, Andreas A1 - Lippmann, Thomas A1 - Göken, Mathias A1 - Pyczak, Florian A1 - Clemens, Helmut T1 - Microstructure development and hardness of a powder metallurgical multi phase gamma-TiAl based alloy T2 - Intermetallics Y1 - 2012 U6 - https://doi.org/10.1016/j.intermet.2011.11.015 SN - 0966-9795 IS - 22 SP - 231 EP - 240 ER - TY - CHAP A1 - Hauschildt, Katja A1 - Stark, Andreas A1 - Lorenz, Uwe A1 - Schell, Norbert A1 - Fischer, Torben A1 - Blankenburg, Malte A1 - Müller, Martin A1 - Pyczak, Florian T1 - Diffusion brazing of γ-TiAl-alloys: Investigations of the joint by electron microscopy and high-energy X-ray diffraction T2 - Intermetallic-based alloys - science, technology and applications, symposium held November 25-30, Boston, Massachusetts, U.S.A Y1 - 2013 U6 - https://doi.org/10.1557/opl.2012.1750 SP - 215 EP - 220 PB - Cambridge Univ. Press CY - Cambridge ER - TY - GEN A1 - Gabrisch, Heike A1 - Stark, Andreas A1 - Schimansky, Frank-Peter A1 - Wang, Li A1 - Schell, Norbert A1 - Pyczak, Florian T1 - Carbides in Ti-45Al-5Nb alloys with different carbon contents T2 - Intermetallics Y1 - 2013 SN - 0966-9795 IS - 33 SP - 44 EP - 53 ER - TY - CHAP A1 - Gabrisch, Heike A1 - Lorenz, Uwe A1 - Oehring, Michael A1 - Paul, Jonathan A1 - Pyczak, Florian A1 - Rackel, Marcus W. A1 - Schimansky, Frank-Peter A1 - Stark, Andreas T1 - TiAlNb-alloy with a modulated B19 containing constituent produced by powder metallurgy T2 - Intermetallic-based alloys - science, technology and applications, symposium held November 25-30, Boston, Massachusetts, U.S.A Y1 - 2013 U6 - https://doi.org/10.1557/opl.2012.1575 SP - 35 EP - 40 PB - Cambridge Univ. Press CY - Cambridge ER -