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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Advances in Multi-Principal Elements Alloys X: Alloy Development and Properties
Presentation Title Plastic Deformation and Defect Recovery of NiTi-based B2-phase High-entropy Intermetallic Compounds
Author(s) Ya-Jing Lee, Ting-Ying Shih, Cheng-Yuan Tsai, Chi-Huan Tung, Shou-Yi Chang
On-Site Speaker (Planned) Ya-Jing Lee
Abstract Scope High-entropy intermetallic compounds have been developed in recent years to overcome the strength-ductility trade-off of engineering alloys. However, the activities of defects in high-entropy intermetallic compounds remain unclear because of their complex configurations and lattice distortions. In this study, the mechanical properties, plastic deformation and defect recovery of NiTi-based, ordered B2-phase high-entropy intermetallic compound were hence investigated by using nanoindentation and micropillar compression. Experimental results indicated that a higher temperature led to a lower hardness/yield strength and more long dislocation bursts/slips, whereas a lower strain rate caused a lower hardness/yield strength but more short dislocation bursts/slips owing to strain rate sensitivity (0.006 at room temperature and 0.017 at 300C). At a high temperature and a low strain rate, as well as verified by cyclic micropillar compression tests, defect recovery (rejuvenation) was found to cause a dropped yield stress, a reduced strain hardening rate and improved plasticity.
Proceedings Inclusion? Planned:
Keywords High-Entropy Alloys, Mechanical Properties, Modeling and Simulation

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