Effect of Hf/Zr Ratio on Shape Memory Properties of High Temperature Ni50.3Ti29.7(Hf,Zr)20 Alloys

被引：26
作者：
Bigelow, G. S. [1 ]
Benafan, O. [1 ]
Garg, A. [1 ,2 ]
Noebe, R. D. [1 ]
机构：
[1] NASA, Glenn Res Ctr, Mat & Struct Div, Cleveland, OH 44135 USA
[2] Univ Toledo, Toledo, OH 43606 USA
来源：
SCRIPTA MATERIALIA | 2021年 / 194卷
关键词：
High temperature shape memory alloys; NiTiHf; NiTiZr; NiTiHfZr; Actuators; H-phase; TI-NI-ZR; MARTENSITIC-TRANSFORMATION; MECHANICAL-BEHAVIOR; RICH NITIHF; HF; MICROSTRUCTURE; PRECIPITATION; PHASE; COMPATIBILITY; STRAINS;
D O I：
10.1016/j.scriptamat.2020.11.008
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A series of Ni50.3Ti29.7(Hf,Zr)(20) (Zr=0 to 20 at %) high-temperature shape memory alloys were investigated to determine the effect of varying Hf/Zr ratio on shape memory properties. Uniaxial constant-force thermal cycling (UCFTC) tests and electron microscopy were used to determine the effect of composition on microstructure, transformation temperatures, and functional material properties. In general, substitution of Zr for Hf resulted in a slight decrease in transformation temperatures, a negligible change in transformation strain, and an improvement in dimensional stability. Thus, the entire range of NiTiHfZr alloys resulted in acceptable actuation properties across the compositions studied with the additional ability to adjust composition for cost and mass savings. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：6
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