选用高纯度Ni单晶体,利用扫描电镜原位拉伸,观察了充氢后Ni单晶裂纹尖端的变形过程。发现氢的存在不改变在混合型载荷作用下,裂纹尖端的塑性变形特征。用网格法加计算机处理系统,测出氢显著促进裂纹尖端区域内的局部塑性变形。
The deformation process and the strain field ahead of crack tip in Nisingle crystal have been studied under SEM, and by grid method as well as compu-ter image processing. The presence of hydrogen extends the localized plastic bandinhomogeneous further and significantly increases the plasticity in high deep strainarea.
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