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Open AccessArticle

Effect of Solution Treatment on the Shape Memory Functions of (TiZrHf)50Ni25Co10Cu15 High Entropy Shape Memory Alloy

1
Department of Mechanical Engineering, National Taiwan University, Taipei 106, Taiwan
2
Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan
*
Author to whom correspondence should be addressed.
Entropy 2019, 21(10), 1027; https://doi.org/10.3390/e21101027
Received: 29 September 2019 / Revised: 19 October 2019 / Accepted: 21 October 2019 / Published: 22 October 2019
(This article belongs to the Special Issue High-Entropy Materials)
This study investigated the effects of solution treatment at 1000 °C on the transformation behaviors, microstructure, and shape memory functions of a novel (TiZrHf)50Ni25Co10Cu15 high entropy shape memory alloy (HESMA). The solution treatment caused partial dissolution of non-oxygen-stabilized Ti2Ni-like phase. This phenomenon resulted in the increment of (Ti, Zr, Hf) content in the matrix and thus increment of the Ms and Af temperatures. At the same time, the solution treatment induced a high entropy effect and thus increased the degree of lattice distortion, which led to increment of the friction force during martensitic transformation, resulting in a broad transformation temperature range. The dissolution of the Ti2Ni-like phase also improved the functional performance of the HESMA by reducing its brittleness and increasing its strength. The experimental results presented in this study demonstrate that solution treatment is an effective and essential way to improve the functional performance of the HESMA. View Full-Text
Keywords: high entropy alloy; shape memory alloy; shape memory effect; pseudoelasticity; martensitic transformation high entropy alloy; shape memory alloy; shape memory effect; pseudoelasticity; martensitic transformation
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MDPI and ACS Style

Lee, H.-C.; Chen, Y.-J.; Chen, C.-H. Effect of Solution Treatment on the Shape Memory Functions of (TiZrHf)50Ni25Co10Cu15 High Entropy Shape Memory Alloy. Entropy 2019, 21, 1027.

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