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沿晶断裂是氢致开裂的一个重要方式.有人在氢致沿晶断口上观察到大量塑性变形,因而认为氢促进沿晶断裂是氢促进局部塑性变形的结果.但也有人认为是由于氢降低了晶界原子问的结合力造成的。用高压电镜进行动态观察的结果表明,Fe 和 Ni 中氢致沿晶界断裂实际上是由于晶界附近高度塑性变形引起的沿晶界附近的滑移面开裂.我们的工作表明,氢能够促进位错的增殖和运动.对于 Fe-3%Si 单晶体,氢能够促进由于位错运动和反应引起的沿{001}面解理。
Intergranular fracture is an important way of hydrogen induced cracking.It was observed that a large number of plastic deformation hydrogen-induced intergranular fracture, and therefore that hydrogen to promote intergranular fracture is the result of hydrogen to promote local plastic deformation.However, it is also believed that due to hydrogen reduction The grain boundary atoms asked the binding force caused. The results of dynamic observation with high-pressure electron microscopy showed that the hydrogen-induced intergranular fracture in Fe and Ni is actually caused by the delamination of the sliding surface near the grain boundaries caused by the high plastic deformation around the grain boundaries. Our work shows that hydrogen can promote Dislocation proliferation and motions. For Fe-3% Si monocrystals, hydrogen can promote cleavage along the {001} plane due to dislocation motion and reaction.