Small-Scale Insight into Uniform Deformability and Softening Resistance of Refractory High-Entropy Alloy
Cheng-Yuan Tsai, Wen-Ju Chen, Yuan-Tao Hsu, Chi-Huan Tung, Su-Jien Lin, Jien-Wei Yeh, Shou-Yi Chang
TL;DR
This paper explores how refractory high-entropy alloys resist softening and deform under stress, using advanced techniques to study their mechanical behavior at different temperatures.
Contribution
The study reveals how compositional complexity in HEAs affects deformation mechanisms and softening resistance.
Findings
HEAs show reduced elastic and plastic anisotropy while maintaining high-temperature strength.
Increased compositional complexity leads to homogeneous flow and smoother stress serrations.
Lattice distortion promotes dislocation nucleation but hinders glide, enhancing work hardening.
Abstract
Owing to the outstanding softening resistance and thermal stability of BCC-structured refractory high-entropy alloys (HEAs), their unique deformation-induced defect structures merit investigation. Therefore, this study evaluated the mechanical properties and deformation behaviors of W-based low- to high-entropy alloys at various temperatures and orientations using nanoindentation and microcompression, complemented by post-mortem TEM and atomistic simulations to observe dislocation populations and their evolution. Results reveal that HEAs exhibit reduced elastic and plastic anisotropy while retaining high-temperature strength. With increasing compositional complexity, planar slip and abrupt stress drops were progressively replaced by homogeneous flow and smoother serrations. Severe lattice distortion promoted dislocation nucleation but impeded long-range glide, enabling cooperative edge…
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Taxonomy
TopicsHigh Entropy Alloys Studies · Magnesium Alloys: Properties and Applications · High-Temperature Coating Behaviors