|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Micro-Mechanical Properties and Plastic Deformation Behavior of Refractory Low-to-High-Entropy Alloys at Different Temperatures
||Ping-Hsu Ko, Yuan-Tao Hsu, Chi-Huan Tung, Shou-Yi Chang
|On-Site Speaker (Planned)
For application to aerospace industry, refractory high-entropy alloys have been intensively developed. Their microscale mechanical properties and plastic deformation behavior at different temperatures are worth further investigations for understanding the defect activities and mechanical reliability in severe operation conditions. Hence in this study, the mechanical properties and plastic deformation of refractory low-entropy W, medium-entropy WTaMo and high-entropy WTaMoNbV alloys were examined by using single-grain (100 and 111 oriented) nanoindentation and micropillar (100 oriented) compression at 80 to 300C. The hardness and yield strength of the alloys decreased with increasing temperature, while the high-entropy alloy was much softening resistant. The low- and medium-entropy alloys exhibited obvious plastic anisotropy with varied hardness in different orientations and clear long dislocation slips. By contrast, the high-entropy alloy deformed much uniformly with small slips and a high work hardening rate owing to the short-range motion and active double cross slips of small dislocation loops.
||High-Entropy Alloys, Mechanical Properties, High-Temperature Materials