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利用电子背散射衍射(EBSD)及透射电镜(TEM)研究在脉冲电流作用下Ti-6Al-4V钛合金冷拉拔变形后组织及织构的演变。研究结果表明:施加脉冲电流可以促进非有利滑移取向的晶粒发生变形,从而使Ti-6Al-4V钛合金各晶粒之间的变形更为协调。常规拉拔和电塑性拉拔的丝材织构对比显示,脉冲电流促进钛合金柱面,滑移,抑制锥面滑移,通过晶界滑移协调c方向应变。电塑性拉拔钛合金的小角度晶界比例降低,说明脉冲电流抑制了变形诱发伴生位错晶界和几何必须晶界的形成。
Electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) were used to investigate the microstructure and texture evolution of Ti-6Al-4V titanium alloy after cold drawing by pulse current. The results show that the pulse current can promote the deformation of the grains with the unfavorable slip orientation, so that the deformation between the grains of Ti-6Al-4V titanium alloy is more coordinated. Contrasting the conventional drawing and the electroplating texture drawing, the impulse current can promote the sliding of the titanium alloy column, slip, and inhibit the sliding of the cone, and coordinate the c-direction strain . The decrease of the ratio of small-angle grain boundaries in the electroplastically drawn titanium alloy indicates that the pulse current suppresses the deformation-induced dislocation-associated grain boundaries and the formation of the geometrically necessary grain boundaries.