High-temperature shape memory properties of Cu15Ni35Ti25Hf12.5Zr12.5 high-entropy alloy

被引：28
作者：
Chang, Shan-Hsiu [1 ]
Kao, Wei-Pin [1 ]
Hsiao, Kai-Yuan [1 ]
Yeh, Jien-Wei [1 ,2 ]
Lu, Ming-Yen [1 ,2 ]
Tsai, Che-Wei [1 ,2 ]
机构：
[1] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan
[2] Natl Tsing Hua Univ, High Entropy Mat Ctr, Hsinchu 30013, Taiwan
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2021年 / 14卷
关键词：
High-entropy alloy; Shape memory alloy; High-temperature martensitic transformation; Dilatometer; Shape recovery ratio; MECHANICAL-PROPERTIES; TEMPERATURE; BEHAVIOR; ZR;
D O I：
10.1016/j.jmrt.2021.07.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The major challenges hindering the application of high-temperature shape memory alloys are their decreased mechanical strength and thermal stability. Herein, we present high-temperature shape memory properties of the Cu15Ni35Ti25Hf12.5Zr12.5 high-entropy alloy with improved mechanical properties and superior shape memory characteristics. Under an immense stress of 1400 MPa, the alloy exhibited a shape recovery ratio of 88.7%. Using an in-situ high-temperature X-ray diffractometer, the alloy was established to undergo phase transformation from B19' to B2 phase. Additionally, the alloy exhibited a martensitic transformation temperature higher than 100 degrees C. The fracture strength and ductility were 1670 MPa and 24.7%, respectively, as measured by compression tests. The deformation mechanism and shape recovery phenomenon of this shape memory alloy are also discussed. This study demonstrates the potential of high-entropy shape memory alloys for high-temperature applications. (C) 2021 The Authors. Published by Elsevier B.V.
引用
收藏
页码：1235 / 1242
页数：8
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