Influence of stress aging process on variants of nano-Ni4Ti3 precipitates and martensitic transformation temperatures in NiTi shape memory alloy

被引：40
作者：
Radi, A. [1 ]
Khalil-Allafi, J. [1 ]
Etminanfar, M. R. [1 ]
Pourbabak, S. [2 ]
Schryvers, D. [2 ]
Amin-Ahmadi, B. [2 ]
机构：
[1] Sahand Univ Technol, Fac Mat Engn, Res Ctr Adv Mat, Tabriz, Iran
[2] Univ Antwerp, Elect Microscopy Mat Sci EMAT, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
来源：
MATERIALS & DESIGN | 2018年 / 142卷
关键词：
NiTi SMA; Stress aging process; Ni4Ti3; precipitates; Preferred orientation; R-phase transformation; R-PHASE TRANSFORMATION; HEAT-TREATMENT; MECHANICAL-PROPERTIES; OXIDATION BEHAVIOR; NI4TI3; TEM; SUPERELASTICITY; ELASTICITY; EVOLUTION;
D O I：
10.1016/j.matdes.2018.01.024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, the effect of a stress aging process on the microstructure and martensitic phase transformation of NiTi shape memory alloy has been investigated. NiTi samples were aged at 450 degrees C for 1 h and 5 h under different levels of external tensile stress of 15, 60 and 150 MPa. Transmission electron microscopy (TEM) was used to characterize different variants and morphology of precipitates. The results show that application of all stress levels restricts the formation of precipitates variants in the microstructure after I h stress aging process. However, all variants can be detected by prolonging aging time to 5 h at 15 MPa stress level and the variants formation is again restricted by increasing the stress level. Moreover, the stress aging process resulted in changing the shape of precipitates in comparison with that of the stress-free aged samples. Coffee-bean shaped morphologies were detected for precipitates in all stress levels. According to the Differential Scanning Calorimetry (DSC) results, the martensite start temperature (M-s) on cooling shifts to higher temperatures with increasing the tensile stress during the aging process. This can be related to the change ofaustenite to martensite interface energy due to the different volume fractions and variants of precipitates. (c) 2018 Elsevier Ltd. All rights reserved.
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页码：93 / 100
页数：8
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