|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Mechanical Properties and Deformation Behavior of NiTi-Based Low-, Medium- and High-Entropy Intermetallic Compounds at Different Temperatures
||Cheng-Yuan Tsai, Chi-Huan Tung, Shou-Yi Chang
|On-Site Speaker (Planned)
Shape memory alloys have the unique effects of shape memory and pseudoelastic response owing to martensitic transformations. In recent years, high-entropy intermetallic compounds have been developed to improve the shape memory and pseudoelastic performance. However, the martensitic transformation and dislocation activities in high-entropy compounds remain unclear because of their complex configuration and large lattice distortion. In this work, the mechanical response and deformation behavior of NiTi-based low-entropy (binary), medium-entropy (quaternary) and high-entropy (senary) intermetallic compounds were investigated by using nanoindentation and in-situ micropillar compression in SEM from cryogenic to high temperatures. Experimental results indicated that, in the low-entropy compound, a regular martensitic transformation yielded a typical deformation anisotropy and the interestingly ascending modulus/hardness with temperature. In comparison, in the high-entropy compound, the activities of abundant short-range defects prior to a martensitic transformation led to the uniform barrel-like deformation of the pillars and the descending mechanical properties with temperature.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume