机械合金化制备纳米晶Ti-6Al-4V合金

采用机械合金化制备Ti-6Al-4V粉末。结果表明:采用机械合金化可以制备纳米晶Ti-6Al-4V合金粉,其反应机理以扩散为主,该固态反应是缺陷能和碰撞能共同作用的结果;随球磨时间延长,部分V固溶于Ti中形成置换固溶体Ti(V),球磨过程中没有中间相生成。球磨40 h后都能获得纳米晶,60 h的粉末为纳米晶和非晶的混合物,晶粒尺寸小于60 nm;60 h后晶粒尺寸变化缓慢。球磨后Ti、Al、V的原子比近似为90:6:4,与Ti-6Al-4V元素成分一致。

Preparation of Nanocrystalline Ti-6Al-4V Alloy by Mechanical Alloying

Ti-6Al-4V(TC4)has been the most highly used titanium alloy, and it is the world leading in the applications of titanium alloys. In this paper, mechanical alloying is adopted to prepare Ti-6Al-4V alloy powder, the experimental results show that: mechanical alloying can prepare nanocrystalline Ti-6Al-4V alloy powder, the reaction mechanism dominated by diffusion, and the solid-state reaction is the result of defects in energy and interaction of the collision energy. With increasing milling time, substitution solid solution Ti(V)formed in the process, there is no intermediate phase generated in milling process. After milling for 40h can obtain nanocrystalline, nanocrystalline and polycrystalline mixtures obtained for 60 hour. The grain sizes are less than 60nm and little change in grain size after milling for 60h. After milling, the atomic ratio of Ti, Al, V is near to 90:6:4, which is consistent with the Ti-6Al-4V elemental composition.