| Author(s) |
Hugh Shortt, Juntan Li, David Fieser, Alfredo Navarrete Nunez, Xuesong Fan, Nathan Grain, Nusrat Yasmin, Xin Wang, Khachatur Manukyan, Shuai Chen, Melanie Kirkham, Cheng Li, Stephen Giles, Debasis Sengupta, Michael Gao, Ke An, Yan Chen, Haixuan Xu, Eric Lass, Anming Hu, Andrew Chihpin Chuang, Jun-Sang Park, Klaus-Dieter Liss, Peter K. Liaw |
| Abstract Scope |
The present work examines how Low Cycle Fatigue (LCF) drives microstructural and phase evolution in CoNiV, the strongest single phase FCC based medium entropy alloy reported to date. LCF testing is integrated with CALPHAD, density functional theory, and molecular dynamics simulations to reveal the transformation from single phase FCC to FCC + κ phases, enabled by cyclic plasticity and planar faulting that reorganizes the three layer stacking sequence into a chemically ordered nine layer structure. Using advanced neutron techniques, we track in situ strain accumulation and phase evolution as a function of plastic deformation and pair these observations with fatigue modeling to assess performance, deformation mechanisms, and engineering implications. Complementary in situ synchrotron LCF experiments provide pole figure evolution, capturing texture changes associated with LCF induced phase and strain development. |