热处理对旋转摩擦挤压合金化Ti-Al系合金织构与晶粒错位角分布的影响

Effect of Heat Treatment On the Texture and Grain Misorientation Angle Distrinbution of Ti-Al Alloy by Rotating Friction Extrusion Alloying

利用EBSD技术对旋转摩擦挤压合金化Ti-Al系合金和热处理后合金进行微区织构和晶粒取向分析。研究结果表明,旋转摩擦挤压合金化Ti-Al系合金是由多相组成,不同相的织构各不相同,其中Al2Ti相晶粒择尤取向为{12,-3,7}﹤9,-8,12﹥,经热处理后合金中Al2Ti相依然存在织构,但其择优取向发生变化,变为{19,4,0}﹤-4,19,6﹥。Ti-Al系合金晶粒错位角主要以大角度晶界为主,小角度晶界很少;热处理后合金中的晶粒错位角角度范围缩小,其中大部分为大角度晶界,小角度晶界进一步减少,且整个晶界数量相对初始试样下降了一个数量级。

The micro texture and grain rientation of Ti-Al alloy by rotating friction extrusion alloying are analyzed by EBSD technology. The results show that Ti-Al alloy by rotating friction extrusion alloying is formed by polyphase, the texture of each phase are not identical, among them the preferred orientation of Al2Ti phase is the t 12, 3, 7 1 〈 9, - 8, 12 〉 , and there is still texture in the Al2Ti phase after heat treatment, but the preferred orientation is changed to {19,4,0t 〈 -4,19,6 〉. Grain misorientation an- gle of the Ti-Al alloy are mainly composed of large angle grain boundaries and smaller angle grain bounda- ry. The range of grain misorientation angle is smaller after heat treatment, most of them are large angle grain boundaries, small angle grain boundary further reduced and the number of grain misorientation is re- duced by an order of magnitude relative to the initial sample.