|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Nanoscale Deformation Twinning in CrCoNi Medium-entropy Alloy Investigated by Molecular Dynamics Simulation
||Jun Ding, Mark Asta, Robert O Ritchie
|On-Site Speaker (Planned)
High-entropy alloys (HEAs) are an intriguing new class of metallic materials due to their unique mechanical behavior. In this work, we employ molecular dynamics simulation using a newly developed empirical potential to study the deformation twinning behavior in CrCoNi medium-entropy alloys, whose combination of strength, ductility and toughness properties approach the best on record. In particular, the atomic mechanism of nanoscale deformation twinning and de-twinning are revealed in detail, compared to that in conventional crystalline alloys. We find that the degree of local chemical order in CrCoNi alloys can tune the deformation twinning mechanism, which demonstrates that local chemical order is very critical to determine the mechanical behavior of these alloys. It thus addresses the pressing need to establish robust processing-structure-property relationships to guide the science-based design of new HEAs with targeted mechanical behavior. This work was supported by DoE-BES-DMSE, under Contract No. DE-AC02-05CH11231.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume