Influence of aging on phase transformation and microstructure of Ni50.3Ti29.7Hf20 high temperature shape memory alloy

被引：20
|
作者：
Prasher, Meenu [1 ]
Sen, Debasis [2 ]
机构：
[1] Bhabha Atom Res Ctr, Glass & Adv Mat Div, Bombay 400085, Maharashtra, India
[2] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 615卷
关键词：
Shape memory; Martensitic phase transformation; Precipitation; Transmission electron microscopy; Small-angle scattering; Hardness; ANGLE NEUTRON-SCATTERING; BEHAVIOR;
D O I：
10.1016/j.jallcom.2014.06.109
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report the effect of aging on phase transformation temperature and mechanical strength of Ni50.3Ti29.7Hf20 high temperature shape memory alloy. Aging of the alloy at 550 degrees C and 650 degrees C increases the martensite phase transformation temperature. Transmission Electron Microscopy and quantitative investigation of microstructure by small-angle scattering confirm the improved hardness of the alloy on aging. Aging at 550 degrees C results in significant volume fraction of fine Ni-rich precipitates. Further, aging at 650 degrees C gives rise to coarsening of the precipitates vis-a-vis reduction in hardness. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：469 / 474
页数：6
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