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采用放电等离子烧结(SPS)技术制备了W-10Ti合金。通过扫描电镜和能谱分析了合金的微观组织,利用Den Broeder方法计算了合金的互扩散系数,测试了合金的密度和显微硬度,并与真空烧结的合金进行了对比。结果表明:与真空烧结相比,SPS烧结的合金组织均匀,富钛相少且细小,W在富钛相中的固溶度和Ti在富钨相中的固溶度都有所增加,且Ti在富钨相中的固溶度增加得更多。W-Ti合金的互扩散系数与W的摩尔浓度有一定的依赖关系,随着W摩尔浓度的升高呈先减小后增大趋势,SPS烧结的合金互扩散系数比真空烧结高出2个数量级。SPS法制备的W-Ti合金相对密度为96.1%,显微硬度HV0.05为5.21 GPa。
W-10Ti alloy was prepared by spark plasma sintering (SPS) technique. The microstructure of the alloy was analyzed by scanning electron microscopy and energy dispersive spectroscopy. The interdiffusion coefficient of the alloy was calculated by Den Broeder method. The density and microhardness of the alloy were tested and compared with those of the vacuum sintered alloy. The results show that, compared with vacuum sintering, the SPS sintered alloy has uniform microstructure, less titanium-rich phase and fine microstructure. Both the solid solubility of Ti in Ti-rich phase and the solid solubility of Ti in the tungsten-rich phase increase The solubility of Ti in the tungsten rich phase increases more. The interdiffusion coefficient of W-Ti alloy has a certain dependence on the molar concentration of W, and then decreases first and then increases with the increase of W molar concentration. The mutual diffusion coefficient of SPS alloy is 2 orders of magnitude higher than that of vacuum sintering. The relative density of W-Ti alloy prepared by SPS method was 96.1%, and the microhardness HV0.05 was 5.21 GPa.