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Forming and controlling of pores by capsule-free hot isostatic pressing in NiTi shape memory alloys

Bin Yuan 1Hao Li 1Chi Yuen Chung 2Ping Huang 1Min Zhu 1

1. School of Mechanical Engineering, South China University of Technology (SCUT), Guangzhou 510641, China
2. City university of Hong Kong (CityU), Tat Chee Avenue, Kowloon, Hong Kong, Hong Kong


The pore evolution process of porous NiTi shape memory alloys (SMAs) fabricated by capsule free hot isostatic pressing (CF-HIP) was investigated by adopting different fabricating parameters in this study. It has been demonstrated that porous NiTi SMAs with homogeneous pore distribution and nearly rounded pore shape can be prepared by CF-HIP under suitable condition. In addition, two special kinds of porous NiTi SMAs with novel pore structure were fabricated by adjusting CF-HIP parameter. One of them has a special sandwich structure distribution of pore along radical section. This structure was formed owing to the balance between hot pressure in the HIP furnace and gas pressure produced by gas expansion in the green sample. Another one shows gradient distribution of pore size along radical direction, increased from outside to the center, which is related to the formation of air bubble in the melting NiTi alloy.


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Presentation: Oral at E-MRS Fall Meeting 2007, Symposium E, by Bin Yuan
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-14 14:39
Revised:   2009-06-07 00:44