|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Nanomechanical Behavior of Precipitation-hardened Nanocrystalline High-entropy Alloy
||Dong-Hyun Lee, Moo-Young Seok, Zhaoping Lu, Jin-Yoo Suh, Upadrasta Ramamurty, Megumi Kawasaki, Terence G Langdon, Jae-il Jang
|On-Site Speaker (Planned)
Recently, high-entropy alloys (HEAs) have emerged as a novel group of structural metallic materials exhibiting interesting mechanical behavior. Recent studies reported that the mechanical properties of HEAs can be further improved by grain refinement or precipitation hardening. Thus, one can expect a synergetic effect on mechanical performance by combining these two strengthening mechanisms. In this study, CoCrFeMnNi HEA was processed by high-pressure torsion and subsequent thermal treatments were performed to incorporate both advantages of nanocrystalline (nc) structure and precipitation. The mechanical behavior of precipitation-hardened nc HEA was investigated through nanoindentation tests with various pyramidal indenters. The obtained results were analyzed in terms of microstructural change underneath the indenter and variation in applied strains that can be controlled by changing indenter angle.
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