Abstract—

A model describing the formation of a strain-induced facet at a high-angle boundary during its interaction with a dislocation pile-up is proposed in this work. The model of continuous dislocation distribution in a pile-up has been used to analyze the conditions under which a facet appears and to calculate its length as a function of the total Burgers vector of the dislocation pile-up and the boundary misorientation angle. The formation of a facet at a grain boundary is possible only if the total Burgers vector exceeds a certain critical value that depends on the external stress and boundary misorientation. The facet length as a function of the initial distance between a dislocation source and a grain boundary at various external stresses and misorientation angles has been calculated in the case of a pile-up replenished by a dislocation source. It is found that the material grain structure refinement and a shift of grain boundaries misorientation spectra into the region of large angles suppress strain induced grain boundary faceting. The facet formation has been shown to be accompanied by the formation of a shear band in the body of the adjacent grain.

中文翻译：

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晶格错位堆积与晶界相互作用过程中应变诱导小平面形成的条件

摘要-

在这项工作中提出了一个模型，该模型描述了高角度边界处的应变诱导小平面与位错堆积相互作用时的形成。堆垛中连续位错分布的模型已用于分析刻面出现的条件，并根据位错堆垛的总Burgers矢量和边界错位角来计算其长度。仅当总Burgers向量超过取决于外部应力和边界取向错误的某个临界值时，才可能在晶界上形成刻面。在由位错源补充堆积的情况下，已经计算出小平面长度，其是位错源与晶界之间的初始距离的函数，该初始距离是在各种外应力和取向差角的作用下。发现材料晶粒结构的细化和晶界取向错误谱向大角度区域的移动抑制了应变诱发的晶界刻面。已经表明，小面的形成伴随着在相邻晶粒的主体中的剪切带的形成。