用TEM 研究了超塑性变形Ti_(-6)Al_(-4)V 合金中接近重位点阵取向(near-CSL)的α晶界,发现在部分晶界上晶界位错(GBD:)的衍衬象变得漫散,但仍然保持线状特征;某些GBD 有局部的分解和束集反应;在α晶界与晶内亚结构的交界处,GBS 通过束集反应形成新的组态;构成晶界坎的各个界面上,GBD 排列的位向各不相同,晶界坎可向晶内发射点阵位错。
The near-coincidence grain boundaries of alpha phase insuperplastically deformed Ti-6Al-4V alloy were investigated with TEM.Itwas found that the image of grain boundary dislocations (GBD) in some ofthe boundaries became diffusive but still maintained line
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