Study on Preparation of Gradient Porous NiTi Alloys by Powder Metallurgy Method

Qiang Li; Jing Yuan Yu; Guo Chao Qi

doi:10.4028/www.scientific.net/AMR.299-300.671

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Study on Preparation of Gradient Porous NiTi Alloys by Powder Metallurgy Method

Abstract:

Gradient porous NiTi alloys were fabricated by powder metallurgy method using NH₄HCO₃ as space-holder. The effect of content and distribution of NH₄HCO₃ on pore characteristic, phase composition and compressive properties was studied. The results showed the content of TiNi phase increased with the decrease of the content of NH₄HCO₃. When the distribution of NH₄HCO₃ varying form 12wt%-12wt%-12wt% to 12wt%-6wt%-12wt% and 12wt%-0wt%-12wt%, the stress and elastic modulus of porous NiTi alloys increased from 228MPa to 321MP and 446MPa, from 4.8GPa to 5.6GPa and 6.8GPa, respectively. Compared with uniform porous materials, gradient porous NiTi alloy exhibited better superelasticity.