Effects of thermal aging on phase transformation and microstructural characteristics of NiTi shape memory alloy

被引：13
作者：
Arunkumar, S. [1 ]
Kumaravel, P. [2 ]
Velmurugan, C. [3 ]
Senthilkumar, V [4 ]
机构：
[1] Vinayaka Missions Kirupananda Variyar Engn Coll, Dept Mech Engn, Salem 636308, Tamil Nadu, India
[2] Inst Rd & Transport Technol, Dept Mech Engn, Erode 638316, Tamil Nadu, India
[3] Presidency Univ, Dept Mech Engn, Bengaluru 560064, India
[4] Natl Inst Technol, Dept Prod Engn, Tiruchirappalli 620015, Tamil Nadu, India
来源：
MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 10期
关键词：
NiTi; shape memory alloy; thermal aging; phase transformation; microstructure; MARTENSITIC-TRANSFORMATION; MECHANICAL-PROPERTIES; SUPERELASTICITY; PRECIPITATION; EVOLUTION;
D O I：
10.1088/2053-1591/ab3b96
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, the effects of aging temperature and time on microstructure and phase transformation behaviors of the NiTi shape memory alloy were investigated with the effects of precipitates. NiTi SMA was synthesized using powder metallurgy process followed by the solution annealing at 850 degrees C for 1 h. The thermal aging process has been executed on NiTi alloy in the temperature range of 450 degrees C-750 degrees C for 1 h, 3 h and 5 h respectively. It was found that the enhancement of transformation temperatures due to the formation of secondary phases during the transformation of cubic to monoclinic. The lenticular structured Ni4Ti3 precipitate was mainly influenced the phase transformation by changing the Ni composition in the NiTi matrix. The significant changes were observed in the austenite and martensite finish temperatures with increasing the aging temperature and time. This study suggests that the NiTi SMA can be implemented in biomedical applications when heat treated at 650 degrees C for 5 h.
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页数：10
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