|About this Abstract
||MS&T21: Materials Science & Technology
||Deformation-induced Phase Transformations
||Localized Phase Transformation at Stacking Faults and the Corresponding Alloy Design Strategy
||Longsheng Feng, Ashton Egan, Timothy M Smith, Shakthipriya Baskar , Michael J. Mills, Maryam Ghazisaeidi, Yunzhi Wang
|On-Site Speaker (Planned)
Recent experimental studies found localized phase transformations (LPTs) at stacking faults in several Ni-based superalloys that significantly enhances creep resistance. Yet the mechanisms underlying the LPTs, in particular, how alloy compositions impact such phenomena are still unclear, imposing challenges to utilize LPTs in alloy design. We present a thermodynamic analysis of the LPT phenomena and address some critical questions such as why LPT happens, why LPT is confined at the stacking faults and how it impacts the mechanical properties. Such a thermodynamic analysis allows us to develop new alloy design criteria for LPT-strengthening, which is used to develop a high-throughput computation framework using CAPHAD to find new superalloys with maximized LPT effect. This work is supported by NSF under the DMREF program.