High-porosity NiTi superelastic alloys fabricated by low-pressure sintering using titanium hydride as pore-forming agent
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Porous NiTi shape memory alloys (SMAs) were successfully fabricated by low-pressure sintering (LPS), and the pore features have been controlled by adjusting the processing parameters. The porous NiTi SMAs with high porosity (45%) and large pore size (200–350 μm) can be prepared by LPS using TiH1.5 as pore-forming agent. These alloys exhibit isotropic pore structure with three-dimensional interconnected pores. The porous NiTi SMA produced by LPS exhibits superelasticity and mechanical properties superior to that by conventional sintering.
KeywordsSpark Plasma Sinter Conventional Sinter Titanium Hydride Ultimate Compressive Strength Porous NiTi
The authors acknowledge the support from National Natural Science Foundation of China (No.50701019), China Postdoctoral Science Foundation (No. 20060390199), the Ministry of Education (Project No IRT0551), Guangdong Provincial Natural Science Foundation (2005 Team project), and City University of Hong Kong Grant (Project No.7002215).
- 3.Zhou JB, Gao LP, Wang KS (2005) J Rare Earth 23:449Google Scholar
- 10.Vandygriff EC, Lagoudas DC, Thangarai JK, Chen YC (2000) Proceedings of ASC 15th annual technical conference. Technomic Publishing Co Inc., Lancaster, p 239Google Scholar
- 17.Barin I (1989) Thermochemical data of pure substances. Weinheim, Federal Republic of Germany; VCH, New YorkGoogle Scholar
- 25.Porter DA, Easterling KE (1997) Phase transformations in metals and alloys. Reprinted 2nd edn. Chapman and Hall, LondonGoogle Scholar