放电等离子烧结温度对Ti-3Zr-2Sn-3Mo-15Nb合金微观组织和力学性能的影响

Effect of spark plasma sintering temperatures on microstructure and mechanical properties of Ti-3Zr-2Sn-3Mo-15Nb alloy

利用放电等离子烧结技术（SPS）制备Ti-3Zr-2Sn-3Mo-15Nb合金，研究烧结温度对合金致密度、微观组织与力学性能的影响。结果表明：在1000-1150℃烧结温度范围内，合金具有较高致密度和抗压强度，合金主要由β-Ti相与Ti-Nb-Zr-Mo固溶体形成的混合基体组织及少量α-Ti相和未熔化的Nb金属颗粒组成；随着烧结温度的升高，合金的致密度和抗压强度呈增大趋势，合金中Ti-Nb-Zr-Mo固溶体含量越来越低，其尺寸越来越小，残留的α-Ti相出现了向β-Ti相的转变；合金的压缩弹性模量值在45-54 GPa之间，显示出良好的力学相容性，而烧结温度的升高使得压缩弹性模量值出现缓慢增大现象。

Ti-3Zr-2Sn-3Mo-15Nb alloys were prepared by spark plasma sintering （SPS） technology. The effects of the different sintering temperatures on the relative density, microstructure and mechanical properties of the alloys were investigated. The results show that, in the sintering temperature range from 1 000 to 1 150℃, the alloys present high densification and compressive strength. The alloys mainly contain the mixed matrix consisting β-Ti phase and the Ti-Nb-Zr-Mo solid solution and some α-Ti phase and unmelted Nb metal particles. With the increase of the sintering temperature, the relative density and the compressive strength of the alloys increase. The size and the amount of the Ti-Nb-Zr-Mo solid solution decrease, and the alloys appear in the transformation process fromα-Ti toβ-Ti phase. The alloys exhibit low compressive elastic modulus in 45？54 GPa, which reveals the better mechanical compatibility. With the increase of the sintering temperature, the compressive elastic modulus of the alloys increases slowly.