期刊
SCRIPTA MATERIALIA
卷 158, 期 -, 页码 83-87出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.08.019
关键词
High temperature shape memory alloys; Multi-component alloys; High entropy alloys; Martensitic transformation; Superelasticity
类别
资金
- United Technologies Research Center through NASA [NNX15AR27A]
- US Air Force Office of Scientific Research [FA9550-15-1-0287]
- Div Of Engineering Education and Centers
- Directorate For Engineering [1461202] Funding Source: National Science Foundation
This paper presents martensitic transformation characteristics of selected multi-component (Ni,Pd)(50)(Ti, Hf,Zr)(50) alloys, with an emphasis on superelasticity and thermal actuation behavior. We report, for the first time, austenite finish temperatures beyond 700 degrees C in NiTi-based high temperature shape memory alloys without the presence of platinum and gold. The increase in transformation temperatures, and transformation stress and recovered strains at elevated temperatures are attributed to the high configurational entropy of the studied alloys. Based on the current findings, we introduce multi-component ultra-high temperature shape memory alloys, which are expected to pioneer a completely new field of study and applications for shape memory alloys. (C) 2018 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
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