|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Effects of initial grain size on friction stir weldability and cryogenic tensile properties for rolled and cast CoCrFeMnNi high-entropy alloys
||Sangwon Park, Youngsang Na, Hyoung-Seop Kim, Namhyun Kang
|On-Site Speaker (Planned)
This study investigated the influence of the initial grain size on the plastic deformation and tunnel defects that occurred from friction stir welding of CoCrFeMnNi high entropy alloys (HEAs). The cast HEA with a large grain size had a larger resistance to plastic deformation owing to the larger fraction of ∑3 twin boundaries than the rolled HEA during friction stirring. This was associated with the high strain hardening rate during tensile testing and to the significant amount of W dissolved from the stirring tool in the cast HEA weld. Thus, the cast HEA weld had a higher tunnel defects ratio and poor weldability as compared to the rolled HEA weld. Additionally, the cryogenic tensile properties of rolled HEA were investigated.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume