Preparation and Properties of Superelastic Porous β-Phase Ti16Nb4Sn Alloy

The porous Ti16Nb4Sn alloy was prepared using low pressure sintering(LPS) process.The effect of sintering temperature on the pore morphology,microstructure and mechanical properties of the alloy was studied.The mechanism of the effect was analyzed.The results show that the porous Ti16Nb4Sn alloy sintered at 1 050℃ had low porosity,many closed cells and small size pores (0-50 μm) which distributed discretely.The microstructure was composed of main β phase with few α″ phase.The alloy had superplasticity.The porous Ti16Nb4Sn alloy sintered at 1 380℃ had high porosity and open porosity,whose pore size was in the range of 50-300 μm with network-like distribution and unobvious anisotropy.The microstructure was composed of β phase.The porous Ti16Nb4Sn alloy sintered at 1 380℃ had higher strength and lower superplasticity than the alloy sintered at 1 050℃.