用蚀坑法观察了Zn 单晶解理裂纹前端位错。结果表明,裂纹前端位错密度分布具有DFZ模型预言的特征,且裂纹尖端与第一个位错的距离X_1(即DFZ 值)以及范性区位错数N 均与根据Majumdar 和Burns 的DFZ 理论推算数值吻合较好。在此基础上,对裂纹前端发射位错和位错屏蔽裂纹前端等问题作了讨论。
Dislocation distribution ahead of a cleavage crack tip in Zn single crystal isobserved by using etch pit technique.The results show that this distribution has the featurepredicated by the DFZ models,and both X_1,the distance from the crack tip to the firs
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