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Superelastic Porous NiTi with Adjustable Porosities Synthesized by Capsule-Free Hot Isostatic Pressing

Shuilin Wu 2Xiangmei Liu 1Jonathan Chung 2Paul K. Chu 2Roy Chan 1John K. Lam 1Chenglin Chu 1,3William Lu 1Keith Luk 1Kenneth Cheung 1Kelvin Yeung 2

1. Department of Orthopaedic and Traumatology, Faculty of Medicine, The University of Hong Kong (HKU), 5/F, Professorial Blk, Queen Mary Hospital, Pokfulam, Hong Kong 0852, Hong Kong
2. City university of Hong Kong (CityU), Tat Chee Avenue, Kowloon, Hong Kong, Hong Kong
3. Southeast University (SEU), Nanjing 210000, China


Porous NiTi with different porosities were fabricated by capsule-free hot isostatic pressing (CF-HIP). The effects of the cold compaction pressure and TiH2 addition on the properties of porous NiTi alloys prepared by CF-HIP were systematically investigated. The porosity of the porous materials varies with the cold compaction pressure of the green compacts. TiH2 addition significantly improves both the porosity and pore interconnection, but slightly impairs the mechanical properties of porous NiTi alloys. In comparison with porous NiTi fabricated by other methods, the stress-strain curves reveal that porous NiTi prepared by CF-HIP has higher compression strength and excellent superelasticity (SE). Furthermore, the phase transformation temperature shifts to a slightly lower value with TiH2 addition, which favors the superelasticity of porous NiTi at human body temperature.


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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium E, by Kenneth Cheung
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-11 19:55
Revised:   2009-06-07 00:44