About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Multi-Principal Element Alloys II
|
Presentation Title |
Sequential Deformation-induced Phase Transformations in a Fe-Cr-Co-Ni Medium-entropy Alloy Explains Its Mechanical Behavior |
Author(s) |
Ying Yang, Weicheng Zhong, Easo George |
On-Site Speaker (Planned) |
Ying Yang |
Abstract Scope |
Phase transformations have been used to control the mechanical behaviors in alloys. Deformation induced one-step martensite transformation have been commonly observed to enhance work hardening rate. In this work, a two-step sequence of deformation induced phase transformation is activated in a non-equiatomic Fe-Cr-Co-Ni alloy at 77 K. Significant nanotwinning occurs at 293 K, whereas a sequential phase transformation (fcc to hcp-martensite to bcc-martensite) occurs at 77 K. Such sequential transformation enables high and sustained work hardening. Density functional theory calculation was performed to examine the relative phase stability and to provide an insight of its effects on the phase transformation sequence. This work represents the first detailed experimental observation of two-step transformation in a solid solution high-/medium-entropy alloy, and provides a new phase transformation pathway for sustaining work hardening in alloys. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |