|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||J-113: Microstructure Characterization of Oxide Dispersion Strengthened CoCrFeMnNi High Entropy Alloy Synthesized by Cryo-milling and Spark Plasma Sintering
||Seunghyeok Chung, Bin Lee, Soo Yeol Lee, Ho Jin Ryu
|On-Site Speaker (Planned)
The effects of alloyed powder preparation, cryo-milling conditions and spark plasma sintering conditions on the nanostructures of oxide dispersion strengthened (ODS) CoCrFeMnNi high entropy alloys (HEAs) were investigated to enhance the high temperature strength and irradiation resistance further. In order to control the oxide dispersoids size and distribution, the mixture of CoCrFeMnNi atomized powder and 0.5wt%Y2O3 powder, and CoCrFeMnNi-0.5wt%Y atomized powder were prepared and cryo-milled at 97 K, respectively. After spark plasma sintering at 973, 1073, 1173 K, the microstructures of oxide dispersoids and the HEA matrix are characterized by EBSD, SEM, TEM, EDS and SANS. The size of oxide dispersoids and the grain size of CoCrFeMnNi decreased with spark plasma sintering temperature. We found that the use of CoCrFeMnNi-0.5wt%Y enhanced the refinement of oxide dispersoids in the CoCrFeMnNi HEA matrix. The mechanical properties measured by Vickers hardness and nanoindentation were significantly enhanced in ODS-HEA prepared with CoCrFeMnNi-0.5Ywt% atomized powder.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume