论文部分内容阅读
通过测定单晶Ｎｉ基合金拉伸初始蠕变曲线及使用ＴＥＭ对平行于（１００）晶面，不同蠕变时间的试样，进行组织形貌观察．表明：受压应力的γ基体通道中位错运动运动阻力大，位错扩展多以交滑移方式进行，扩展距离短当受张应力通道中扩展位错环经交滑移进入压应力通道后，入口两侧；被“钉扎”，位错环可定向扩展成为类似双端“Ｆ－Ｒ”的位错组态；γ′相形成后，蠕变速率明显减小，初始蠕变服从Ａｎｄｒａｄｅ规律．
The morphology of the samples was observed by measuring the initial tensile creep curve of single crystal Ni-based alloy and using TEM to test the samples parallel to the (100) plane and different creep time. It is shown that the movement of dislocation in the γ matrix channel under compressive stress is large and the dislocation propagation is mostly carried out by the cross slip method. When the extended distance is short, the extended dislocation loop in the tensile stress channel enters the compressive stress channel by cross-slip , Dislocation loops can be directionally expanded into a dislocation configuration similar to double-ended “F-R” by “pinning”. When the γ ’phase is formed, the creep rate obviously decreases, and the initial creep follows Andrade law.