Study on Effect of Sintering Temperature on Microstructure and Compressive Property of Porous NiTi Alloys

Jing Yuan Yu; Qiang Li

doi:10.4028/www.scientific.net/AMR.299-300.480

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Study on Effect of Sintering Temperature on Microstructure and Compressive Property of Porous NiTi Alloys

Abstract:

Porous NiTi alloys were prepared by powder metallurgy method using NH₄HCO₃ as space-holder. The effect of sintering temperature on pore characteristic, phase composition and compressive property of porous NiTi alloys was studied by XRD, SEM, EDS and a universal testing machine. The results show with the increase of sintering temperature the porosity of porous NiTi alloys first increases and then decreases, but the content of NiTi phase, compressive strength and modulous of sintered products continuously increase. When sintered at 980°C for 2h, the porous NiTi alloys have higher porosity of 53.6%, better compressive strength of 173.7MPa and elastic modulous of 4.2GPa. The phases of sinter products are mainly composed by TiNi, Ti₂Ni, and TiNi₃ phases.