About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
High Entropy Alloys VIII
|
Presentation Title |
Metastability Engineering of HIgh Entropy Alloys |
Author(s) |
Hyoung Seop Kim, Jae Wung Bae |
On-Site Speaker (Planned) |
Hyoung Seop Kim |
Abstract Scope |
In this presentation, we utilized metastibility engineering and multiple-stage strain hardening in a ferrous Fe60Co15Ni15Cr10 (at%) MEA and achived a good combination of cryogenic tensile strength and ductility. Astonishingly, detailed microstructural observations at each stage reveal the sequential operation of deformation-induced phase transformation from parent fcc to newly formed bcc (body-centered cubic) phases. The in-situ neutron diffraction studies make it clear that the martensite formation and the concurrent load partitioning between the fcc and the bcc phases play an important role in the increase in strength. Replacing high-cost alloying elements cobalt and nickel with iron, as well as introduction of metastability-engineering at liquid nitrogen temperature, distinguishes the new ferrous MEAs from previously reported equiatomic HEAs. This result underlines insights to provide expanded opportunities for the future development of HEAs for cryogenic applications. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |