Abstract Void growth and morphology evolution in fcc bi-crystals are investigated using crystal plasticity finite element method. For that purpose, representative volume element of bi-crystals with a void at the grain boundary are considered in the analysis. Grain boundary is assumed initially perpendicular/coaxial with the straight sides of the cell. Fully periodic boundary conditions are prescribed in the representative volume element and macroscopic stress triaxiality and Lode parameter are kept constant during the whole deformation process. Three different pairs of crystal orientations characterized as hard-hard, soft-soft and soft-hard has been employed for modelling the mechanical response of the bi-crystal. Simulations are performed to study the implications of triaxiality, Lode parameter and crystallographic orientation on slip mechanism, hardening and hence void evolution. The impact of void presence and its growth on the heterogeneity of lattice rotation and resulting grain fragmentation in neighbouring areas is also analysed and discussed.

中文翻译：

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晶体取向对双晶晶界空洞生长的影响

摘要 采用晶体塑性有限元方法研究了面心立方双晶中的空隙生长和形貌演化。为此，在分析中考虑了在晶界处具有空隙的双晶的代表性体积元素。晶界最初假定为与单元的直边垂直/同轴。在代表性体积单元中规定了全周期边界条件，在整个变形过程中宏观应力三轴度和洛德参数保持恒定。三对不同的晶体取向特征为硬-硬、软-软和软-硬已被用于模拟双晶的机械响应。进行模拟以研究三轴性、矿脉参数和晶体取向对滑移机制的影响，硬化，因此空洞演变。还分析和讨论了空隙的存在及其生长对晶格旋转的不均匀性和由此产生的相邻区域的晶粒破碎的影响。