@misc{BauerNeumeierPyczaketal., author = {Bauer, A. and Neumeier, Steffen and Pyczak, Florian and Singer, Robert F. and G{\"o}ken, Mathias}, title = {Creep properties of different γ'- strengthened Co-base superalloys}, series = {Materials Science and Engineering A}, journal = {Materials Science and Engineering A}, number = {550}, issn = {1873-4936}, pages = {333 -- 341}, language = {en} } @misc{WangPyczakZhangetal., author = {Wang, Li and Pyczak, Florian and Zhang, Jian and Lou, Langhong and Singer, Robert F.}, title = {Effect of eutectics on plastic deformation and subsequent recrystallization in the single crystal nickel base superalloy CMSX-4}, series = {Materials Science and Engineering A}, journal = {Materials Science and Engineering A}, number = {532}, issn = {1873-4936}, pages = {487 -- 492}, language = {en} } @misc{PyczakBauerGoekenetal., author = {Pyczak, Florian and Bauer, A. and G{\"o}ken, Mathias and Neumeier, Steffen and Lorenz, U. and Oehring, Michael and Schell, N. and Schreyer, Andreas and Stark, Andreas and Szymanzik, F.}, title = {Plastic Deformation Mechanisms in a Crept L12 hardened Co-Base Superalloy}, series = {Materials Science and Engineering A}, journal = {Materials Science and Engineering A}, number = {571}, issn = {1873-4936}, pages = {13 -- 18}, language = {en} } @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{PyczakDevrientNeuneretal., author = {Pyczak, Florian and Devrient, B. and Neuner, F. C. and Mughrabi, Hael}, title = {The influence of different alloying elements on the development of the gamma/gamma' microstructure of nickel-base superalloys during high-temperature annealing and deformation}, series = {Acta Materialia}, volume = {53}, journal = {Acta Materialia}, number = {14}, issn = {1359-6454}, pages = {3879 -- 3891}, language = {en} } @misc{VolekPyczakSingeretal., author = {Volek, Andreas and Pyczak, Florian and Singer, Robert F. and Mughrabi, Hael}, title = {Partitioning of Re between gamma and gamma' phase in nickel-base superalloys}, series = {Scripta Materialia}, volume = {52}, journal = {Scripta Materialia}, number = {2}, pages = {141 -- 145}, language = {en} } @inproceedings{BuergelGrossmannLuesebrinketal., author = {B{\"u}rgel, R. and Grossmann, J. and L{\"u}sebrink, O. and Mughrabi, Hael and Pyczak, Florian and Singer, Robert F. and Volek, Andreas}, title = {Development of a New Alloy for Directional Solidification of Large Industrial Gas Turbine Blades}, series = {Superalloys 2004, proceedings of the Tenth International Symposium on Superalloys, held September 19 - 23, 2004 at the Seven Springs Mountain Resort in Champion, Pennsylvania}, booktitle = {Superalloys 2004, proceedings of the Tenth International Symposium on Superalloys, held September 19 - 23, 2004 at the Seven Springs Mountain Resort in Champion, Pennsylvania}, editor = {Green, Kenneth A. and Harada, H. and Howson, T. E. and Pollock, Tresa M. and Reed, Roger C. and Schirra, J. J. and Walston, S.}, publisher = {TMS}, address = {Warrendale, Pa.}, isbn = {0-87339-576-x}, pages = {25 -- 34}, language = {en} } @inproceedings{PyczakBiermannMughrabietal., author = {Pyczak, Florian and Biermann, H. and Mughrabi, Hael and Volek, Andreas and Singer, Robert F.}, title = {CBED Measurement of Residual Internal Strains in the Neighbourhood of TCP Phases in Ni-Base Superalloys}, series = {Superalloys 2000, proceedings of the Ninth International Symposium on Superalloys, held September 17 - 21, 2000, Seven Springs, PA}, booktitle = {Superalloys 2000, proceedings of the Ninth International Symposium on Superalloys, held September 17 - 21, 2000, Seven Springs, PA}, editor = {Pollock, Tresa M. and Kissinger, R. D. and Bowman, R. R. and Green, Kenneth A. and McLean, M. and Olson, S. L. and Schirra, J. J.}, publisher = {The Minerals, Metals \& Materials Society,}, address = {Warrendale, Pa.}, isbn = {0-87339-477-1}, pages = {367 -- 377}, language = {en} } @misc{WangPyczakZhangetal., author = {Wang, Li and Pyczak, Florian and Zhang, Jian and Singer, Robert F.}, title = {On the role of eutectics during recrystallization in a single crystal nickel-base superalloy - CMSX-4}, series = {International Journal of Materials Research}, volume = {100}, journal = {International Journal of Materials Research}, number = {8}, issn = {2195-8556}, pages = {1046 -- 1051}, language = {en} } @misc{RettigHecklNeumeieretal., author = {Rettig, Ralf and Heckl, Astrid and Neumeier, Steffen and Pyczak, Florian and G{\"o}ken, Mathias and Singer, Robert F.}, title = {Verification of a commercial CALPHAD database for Re and Ru containing nickel-base superalloys}, series = {Defect and Diffusion Forum}, journal = {Defect and Diffusion Forum}, number = {289-292}, issn = {1662-9507}, pages = {101 -- 108}, language = {en} } @misc{HaussmannBreslerNeumeieretal., author = {Haußmann, L. and Bresler, J. and Neumeier, S. and Pyczak, F. and G{\"o}ken, M.}, title = {Interdiffusion Coefficients and Strengthening Effects of Nb, Ta, and Zr in the α2-Ti3Al Phase}, series = {Journal of Phase Equilibria and Diffusion}, volume = {45 (2024)}, journal = {Journal of Phase Equilibria and Diffusion}, number = {4}, publisher = {Springer Science and Business Media LLC}, issn = {1547-7037}, doi = {10.1007/s11669-024-01105-y}, pages = {764 -- 771}, abstract = {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.}, language = {en} } @misc{NeumeierFreundBezoldetal., author = {Neumeier, S. and Freund, L. P. and Bezold, A. and K{\"o}brich, M. and Vollh{\"u}ter, J. and Hausmann, D. and Solis, C. and Stark, A. and Schell, N. and Pyczak, F. and Felfer, P. and Gilles, R. and G{\"o}ken, M.}, title = {Advanced Polycrystalline γ′-Strengthened CoNiCr-Based Superalloys}, series = {Metallurgical and Materials Transactions A}, volume = {55}, journal = {Metallurgical and Materials Transactions A}, number = {5}, publisher = {Springer Science and Business Media LLC}, issn = {1073-5623}, doi = {10.1007/s11661-024-07319-6}, pages = {1319 -- 1337}, abstract = {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}, language = {en} }