Large local deflections of a dynamic crack front induced by intrinsic dislocations in brittle single crystals.
Large local deflections of a dynamic crack front induced by intrinsic dislocations in brittle single crystals.
复制标题
由脆性单晶中的固有位错引起的动态裂纹前沿的大局部偏转。
DOI：
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发表时间：
2002
影响因子：
8.6
通讯作者：
E. Zolotoyabko
中科院分区：
文献类型：
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作者：
D. Shilo;D. Sherman;I. Beery;E. Zolotoyabko
我们发现，脆性单晶中的本征位错可以成为沿裂纹路径产生强烈局域微扰的源。建立了预测裂纹前沿挠度的理论模型。研究了诱导位错密度为10(9)-10(10)cm(-2)的Si晶体中的裂纹表面，发现了大量的V形槽形式的裂纹前沿扰动，而在无位错的Si样品中完全没有这种扰动。测得的微扰深度在2-20 nm范围内，与理论模型符合得很好。
We show that intrinsic dislocations in brittle single crystals can be a source of strong local perturbations along the crack path. A theoretical model was developed which predicts substantial crack front deflections. Investigating the crack surfaces in Si crystals with induced dislocation density of 10(9)-10(10) cm(-2) revealed a significant amount of crack front perturbations in the form of V-shaped grooves, which were completely missing in dislocation-free Si specimens. The measured depths of the perturbations were in the range of 2-20 nm and in excellent agreement with the theoretical model.