采用低压烧结工艺制备了多孔Ti16Nb4Sn合金,研究了烧结温度对合金的孔隙形貌、组织结构以及力学性能的影响,揭示了烧结温度对孔隙形成以及力学性能影响的机理.结果表明:1 050℃烧结制备的多孔Ti16Nb4Sn合金的孔隙率较低,闭孔较多,孔径较小(0～50μm),呈离散状分布,组织以β相为主,含有少量α"相,合金具有超弹性;1 380℃烧结制备的多孔合金孔隙率较高,开孔度也较高,孔径分布在50～300 μm之间,呈网状分布,无明显各向异性,组织基本由β相组成,与1 050℃烧结制备的多孔合金相比,强度较高,但是超弹性较差.
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 ℃.
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