扫描电镜在金属材料的延性断裂研究中已得到广泛的应用,尤其是近年来扫描电镜上配上拉伸附件对金属拉伸过程进行动态观察,可以更直接地了解金属拉伸时形变到断裂的物理过程,但由于扫描电镜的样品室尺寸以及加载载荷的限制,这种方法一般只适用于低强度材料的微型试样,而且拉伸时应力,应变也不易精确测出,尤其 Scanning electron microscopy has been widely used in the ductile fracture research of metallic materials. Especially in recent years, the scanning electron microscope coupled with tensile attachment to dynamically observe the metal stretching process can be more direct understanding of metal deformation deformation to fracture However, due to the limitation of sample chamber size and loading load of SEM, this method is generally applicable only to micro-samples of low-strength materials, and it is not easy to accurately measure stress and strain during stretching. In particular,