About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
High Entropy Alloys VIII
|
Presentation Title |
Atomistic Simulations of the fcc-to-hcp Phase Transformation in the Equiatomic CoCrFeMnNi Alloy under High Compression |
Author(s) |
Chin-Lung Kuo |
On-Site Speaker (Planned) |
Chin-Lung Kuo |
Abstract Scope |
We performed the MEAM-based molecular dynamic simulations to investigate the plastic deformation and phase transformation in the CoCrFeMnNi HEA under high compression. Our MD simulations revealed that the stress-induced phase transformations in the CoCrFeMnNi HEA are strongly crystal orientation-dependent. The [001] uniaxial compression can induce significant fcc-to-hcp phase transformation via successive emissions of partial dislocations from the extended stacking faults, twin boundaries and hcp-lamellas created during the early stage of deformation. As for the [110] and [111] uniaxial compressions, however, the hcp atoms can simply form the intrinsic/extrinsic stacking faults. Although the [001] uniaxial compression produced a much lower dislocation density than other systems, it eventually induced much more constituents transformed into the hcp atoms upon the end of phase transformation. Our simulations clearly indicate that the deformation twin boundaries and extended hcp-lamellas play a critical role in facilitating the fcc-to-hcp phase transformation in the CoCrFeMnNi HEA under high compression. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |