The effect of porosity on phase transformation behavior of porous Ti-50.8 at.% Ni shape memory alloys prepared by capsule-free hot isostatic pressing

被引：48

作者：

Yuan, B.

Zhang, X. P. ^{[1
]}

Chung, C. Y.

Zhu, M.

机构：

[1] S China Univ Technol, Inst Mat Sci & Technol, Sch Mech Engn, Guangzhou 510640, Peoples R China

[2] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 438卷

基金：

中国国家自然科学基金;

关键词：

phase transformation; porous TiNi; shape memory alloys; capsule-free hot isostatic pressing; porosity ratio;

D O I：

10.1016/j.msea.2006.02.141

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 [材料科学与工程]; 080502 [材料学];

摘要：

The porous Ti-50.8 at.% Ni shape memory alloys (SMAs) were successfully fabricated by capsule-free hot isostatic pressing (CF-HIP) method. The phase transformation behaviors of the fabricated porous NiTi SMAs with various porosity ratios were investigated. It was seen that the porous alloys show a uniform pore distribution with the spherical pore size ranging mainly from 50 to 200 mu m. And their phase transformation behaviors are similar to that of conventional cast dense Ni-rich TiNi alloys. It has also been seen that phase transformation during cooling process occurs by two steps, that is, R-phase transformation and B19' martensitic transformation, respectively. In addition, it was also found that the pores have a significant influence on B19' martensitic transformation, while little influence on R-phase transformation. The characteristic transformation temperatures and latent heats of B19' martensitic transformation in porous Ti-50.8 at.% Ni SMAs were found to decrease with increasing porosity ratio. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：585 / 588

页数：4

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