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 - Freund, Lisa P. A1 - Stark, Andreas A1 - Pyczak, Florian A1 - Schell, Norbert A1 - Göken, Mathias A1 - Neumeier, Steffen T1 - The grain boundary pinning effect of the µ phase in an advanced polycrystalline γ/γʹ Co-base superalloy T2 - Journal of Alloys and Compounds Y1 - 2018 U6 - https://doi.org/10.1016/j.jallcom.2018.04.204 SN - 0925-8388 VL - 753 SP - 333 EP - 342 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 -