TY - GEN A1 - Bauer, A. A1 - Neumeier, Steffen A1 - Pyczak, Florian A1 - Singer, Robert F. A1 - Göken, Mathias T1 - Creep properties of different γ'- strengthened Co-base superalloys T2 - Materials Science and Engineering A Y1 - 2012 SN - 1873-4936 IS - 550 SP - 333 EP - 341 ER - TY - GEN A1 - Wang, Li A1 - Pyczak, Florian A1 - Zhang, Jian A1 - Lou, Langhong A1 - Singer, Robert F. T1 - Effect of eutectics on plastic deformation and subsequent recrystallization in the single crystal nickel base superalloy CMSX-4 T2 - Materials Science and Engineering A Y1 - 2012 SN - 1873-4936 IS - 532 SP - 487 EP - 492 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 - 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 - Pyczak, Florian A1 - Devrient, B. A1 - Neuner, F. C. A1 - Mughrabi, Hael T1 - The influence of different alloying elements on the development of the gamma/gamma' microstructure of nickel-base superalloys during high-temperature annealing and deformation T2 - Acta Materialia Y1 - 2005 SN - 1359-6454 VL - 53 IS - 14 SP - 3879 EP - 3891 ER - TY - GEN A1 - Volek, Andreas A1 - Pyczak, Florian A1 - Singer, Robert F. A1 - Mughrabi, Hael T1 - Partitioning of Re between gamma and gamma' phase in nickel-base superalloys T2 - Scripta Materialia Y1 - 2005 VL - 52 IS - 2 SP - 141 EP - 145 ER - TY - CHAP A1 - Bürgel, R. A1 - Grossmann, J. A1 - Lüsebrink, O. A1 - Mughrabi, Hael A1 - Pyczak, Florian A1 - Singer, Robert F. A1 - Volek, Andreas ED - Green, Kenneth A. ED - Harada, H. ED - Howson, T. E. ED - Pollock, Tresa M. ED - Reed, Roger C. ED - Schirra, J. J. ED - Walston, S. T1 - Development of a New Alloy for Directional Solidification of Large Industrial Gas Turbine Blades T2 - Superalloys 2004, proceedings of the Tenth International Symposium on Superalloys, held September 19 - 23, 2004 at the Seven Springs Mountain Resort in Champion, Pennsylvania Y1 - 2004 SN - 0-87339-576-x SP - 25 EP - 34 PB - TMS CY - Warrendale, Pa. ER - TY - CHAP A1 - Pyczak, Florian A1 - Biermann, H. A1 - Mughrabi, Hael A1 - Volek, Andreas A1 - Singer, Robert F. ED - Pollock, Tresa M. ED - Kissinger, R. D. ED - Bowman, R. R. ED - Green, Kenneth A. ED - McLean, M. ED - Olson, S. L. ED - Schirra, J. J. T1 - CBED Measurement of Residual Internal Strains in the Neighbourhood of TCP Phases in Ni-Base Superalloys T2 - Superalloys 2000, proceedings of the Ninth International Symposium on Superalloys, held September 17 - 21, 2000, Seven Springs, PA Y1 - 2000 SN - 0-87339-477-1 SP - 367 EP - 377 PB - The Minerals, Metals & Materials Society, CY - Warrendale, Pa. ER - TY - GEN A1 - Wang, Li A1 - Pyczak, Florian A1 - Zhang, Jian A1 - Singer, Robert F. T1 - On the role of eutectics during recrystallization in a single crystal nickel-base superalloy - CMSX-4 T2 - International Journal of Materials Research Y1 - 2009 SN - 2195-8556 VL - 100 IS - 8 SP - 1046 EP - 1051 ER - TY - GEN A1 - Rettig, Ralf A1 - Heckl, Astrid A1 - Neumeier, Steffen A1 - Pyczak, Florian A1 - Göken, Mathias A1 - Singer, Robert F. T1 - Verification of a commercial CALPHAD database for Re and Ru containing nickel-base superalloys T2 - Defect and Diffusion Forum Y1 - 2009 SN - 1662-9507 IS - 289-292 SP - 101 EP - 108 ER - TY - GEN A1 - Haußmann, L. A1 - Bresler, J. A1 - Neumeier, S. A1 - Pyczak, F. A1 - Göken, M. T1 - Interdiffusion Coefficients and Strengthening Effects of Nb, Ta, and Zr in the α2-Ti3Al Phase T2 - Journal of Phase Equilibria and Diffusion N2 - AbstractThe creep properties of fully lamellar γ/α2 titanium aluminides can be significantly improved by alloying with Nb, Ta or Zr. While the influence of these alloying elements on the γ-phase has already been examined, their diffusivity and strengthening properties in the α2-phase are still lacking. In order to study the effect of Nb, Ta and Zr in α2-Ti3Al, the alloys Ti-33Al, Ti-33Al-5Nb, Ti-33Al-5Ta and Ti-33Al-5Zr were investigated using a diffusion couple approach and strain rate jump tests. The results show that Zr diffuses the fastest, followed by Nb and Ta. Furthermore, these alloying elements also increase the strength compared to a binary Ti-33Al alloy, from which Zr leads to the highest strength increase followed by Ta and Nb. The lower diffusivity of Ta becomes increasingly important at higher temperatures and lower strain rates resulting in a higher strengthening potential than Nb and Zr under such conditions. Y1 - 2024 U6 - https://doi.org/10.1007/s11669-024-01105-y SN - 1547-7037 VL - 45 (2024) IS - 4 SP - 764 EP - 771 PB - Springer Science and Business Media LLC ER - TY - GEN A1 - Neumeier, S. A1 - Freund, L. P. A1 - Bezold, A. A1 - Köbrich, M. A1 - Vollhüter, J. A1 - Hausmann, D. A1 - Solis, C. A1 - Stark, A. A1 - Schell, N. A1 - Pyczak, F. A1 - Felfer, P. A1 - Gilles, R. A1 - Göken, M. T1 - Advanced Polycrystalline γ′-Strengthened CoNiCr-Based Superalloys T2 - Metallurgical and Materials Transactions A N2 - AbstractNovel compositionally complex CoNiCr-based superalloys with excellent mechanical properties have been developed, which combine the multiprincipal element nature of high-entropy alloys with the precipitation strengthening in superalloys. A series of advanced polycrystalline γ′-strengthened CoNiCr-based superalloys, called CoWAlloys, with varying contents of Al, W, Ti, Ta, Mo, and Nb are investigated in terms of microstructure, thermophysical properties, yield, and creep strength. The microstructure of all CoWAlloys consists of an fcc solid solution matrix phase (approximate γ composition in at. pct: 50Co–20Ni–20Cr–10X (X = other alloying elements)), which is strengthened by a multicomponent γ′ (Ni,Co)3(Al,Ti,Ta,W,Nb)-based precipitate phase with a very high-volume fraction of around 60 vol pct (approximate γ′ composition in at. pct: 45Ni–30Co–25X). These alloys have high solidus temperatures above 1300 °C and moderate γ′ solvus temperature between 985 °C and 1080 °C leading to a large processing window. The increasing content of γ′-forming elements Ti, Ta, W, and Nb decreases this window, but increases the γ/γ′ lattice misfit and the anti-phase boundary energy, which contribute to a significantly higher yield and creep strength. Their properties are discussed in comparison with conventional polycrystalline Ni-base superalloys and so-called L12-strengthened high-entropy alloys, revealing that the creep strengths of the CoWAlloys are significantly higher. This is due to the reduced strain rate sensitivity of the CoWAlloys due to different underlying deformation mechanisms: By increasing the anti-phase boundary energy, a transition to stacking fault shearing and microtwinning occurs, which leads to the enhanced creep strength. Based on these results, guidelines and strategies for the design of next-generation advanced high-temperature polycrystalline superalloys are proposed. Graphical Abstract Y1 - 2024 U6 - https://doi.org/10.1007/s11661-024-07319-6 SN - 1073-5623 VL - 55 IS - 5 SP - 1319 EP - 1337 PB - Springer Science and Business Media LLC ER -