|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Microstructure and Mechanical Property of FCC HEA with L12 -strengthened Between Cryogenic and Elevated Temperatures
||Che-Wei Tsai, Chia-Ming Kuo
|On-Site Speaker (Planned)
The HEA with FCC matrix phase and L12 precipitates phase were studied. It is found the strain-induced cellular structures were observed in this alloy after thermomechanical treatment, and cellular structures can be eliminated by a slow cooling process. After that, the structures of spherical L12 precipitates uniformly distributed in the matrix were obtained. The present HEAs without cellular structures showed more superior mechanical properties at temperatures from 293K to 1073 K than those with cellular structures. The tensile results show a good combination of strength and ductility at 873K. Furthermore, cryogenic temperatures tensile properties and the corresponding fracture analyses were conducted and investigated. There are multiple-layered stacking faults after 77K tensile test, which act as work-hardening source, can give rise to the yield strength and ultimate tensile strength. The mechanical twinning is also observed in the matrix, which attributes to the ductility of 33% increment at cryogenic temperature.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume