先拉伸后轧制纯镍中滑移系与位错结构的关系

The correlation between slip systems and dislocation structures in tensile-rolled nickel

对柱状晶纯镍样品先拉伸后冷轧,用透射电镜和扫描电镜表征其位错结构。在拉伸变形时形成的结构在后续的轧制变形后保持或改变取决于当应变路径改变时开动的滑移系是否发生了改变。当开动的滑移系发生变化时,最终的结构由第二应变路径中开动的滑移系所决定。这些结果为支持已发表的滑移系活动与位错结构的关系提供了进一步的证明。

Pure columnar-crystal nickel samples were first deformed in tension,followed by cold rolling.The dislocation structures were characterized with transmission electron microscopy and scanning electron microscopy.It is found that whether or not the structure developed during tensile deformation is retained or changes during subsequent cold rolling depends on whether a change in the active slip system is introduced during the strain path change.In the case that there is a change in the active slip systems the final structure is determined by the active slip systems operative during the second strain path.These results provide further strong evidence to support the established relationship between slip system activating and dislocation structures.