期刊
SCRIPTA MATERIALIA
卷 142, 期 -, 页码 153-157出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.07.033
关键词
Superelasticity; Martensitic transformation; Iron-based shape memory alloys; Stress induced martensite; Natural aging
类别
资金
- Transportation Consortium of South Central States through a U.S. Department of Transportation/University Transportation Center Program [69A3551747106]
- NASA Transformative Aeronautics Concepts Program, Transformational Tools & Technologies Project
- Spanish MINECO
- FEDER [MAT2014-56116-C4-1-R]
- Salvador de Madariaga Program [PRX15/00549]
- Ministry of Education and Science of the Russian Federation [16.6554.2017/6.7]
- Tomsk State University Academic D.I. Fund Program [8.140.2017]
In this study, FeMnAINi shape memory alloys are demonstrated to experience room temperature (RT) aging, which manifests itself as a gradual increase in critical transformation stress with time when the sample is kept in a stress-free condition. This effect is sufficient to create superelasticity in the solution treated condition, which does not normally show superelasticity soon after heat treatment. This phenomenon is due to the nucleation and coarsening of nanoprecipitates at room temperature despite the high melting point of the alloy. RT aging also influenced precipitation hardened FeMnAlNi samples by causing an increase in stress hysteresis and hardening rate. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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