Microstructural characterization and superelastic response of a Ni50.3Ti29.7Zr20 high-temperature shape memory alloy

被引：51
作者：
Evirgen, A. [1 ]
Karaman, I. [1 ]
Santamarta, R. [2 ]
Pons, J. [2 ]
Noebe, R. D. [3 ]
机构：
[1] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA
[2] Univ Illes Balears, Dept Fis, E-07122 Palma De Mallorca, Spain
[3] NASA, Glenn Res Ctr, Struct & Mat Div, Cleveland, OH 44135 USA
来源：
SCRIPTA MATERIALIA | 2014年 / 81卷
基金：
美国国家科学基金会;
关键词：
High-temperature shape memory alloys; NiTiZr; Superelasticity; Precipitation; Microstructure; CU-ZN-AL; MARTENSITIC-TRANSFORMATION; BEHAVIOR; ZR;
D O I：
10.1016/j.scriptamat.2014.02.012
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructure and superelastic response of a Ni50.3Ti29.7Zr20 high-temperature shape memory alloy were studied. The alloy exhibited a recoverable strain level of 5% at 170 degrees C and near-perfect superelasticity up to 250 degrees C under 3% applied strain when fine precipitates were present. In this case, large martensite variants easily formed during the stress-induced martensitic transformation while dislocation motion was impeded. In contrast, poor superelastic response was obtained in samples containing large particles that constrain martensite formation to channels between elongated precipitates. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：12 / 15
页数：4
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