采用扫描电镜、透射电镜等方法研究了一种镍基单晶高温合金在1000℃的高温低应力蠕变行为.实验结果表明:合金蠕变速率呈现出先减小再增大的变化趋势,当应变量达到一定临界值(1±0.2)％后,变形速率迅速上升,蠕变进入第三阶段.高温蠕变初始阶段的主要变形机制为a/2<110> {111}型位错环在基体内运动.合金在高温蠕变稳态阶段的主要变形机制为位错切割γ'相,切割位错主要有螺型位错对和[001]超位错两种形式.
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