ABSTRACT In this work, numerical computations of image forces and stored energy during the growth of a strain free grain within a recovered matrix containing an array of identical dislocations are performed. A decrease of the stored energy is observed when image forces are attractive and an increase when image forces are repulsive. The variation of elastic energy depends closely on the material elastic anisotropy, the number of dislocations in the array and its initial distance to grain boundary. For an array of 20 edge dislocations and the motion of a planar grain boundary over approximately 180 atomic spacing, the magnitude of the energy variation is on the order of one dislocation line energy for Al and six for Cu, which is significant in both cases. Furthermore, by sweeping the whole orientation space for FCC crystals, it is shown that grain boundaries near a misorientation are among those that can display the highest attractive forces on edge dislocations. Since grain boundary migration is driven by the reduction of stored energy, the results are analysed in light of experimental recrystallization data in FCC metals which show that the fastest moving boundaries are often characterised by misorientation axis around and misorientation angle close to .

中文翻译：

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晶界迁移率的错误取向依赖性：弹性各向异性的作用

摘要在这项工作中，在包含相同位错阵列的恢复矩阵内，在无应变晶粒生长过程中，对图像力和存储能量进行了数值计算。当图像力具有吸引力时，观察到存储的能量减少，而当图像力为排斥力时，观察到存储能量增加。弹性能的变化与材料的弹性各向异性、阵列中位错的数量及其与晶界的初始距离密切相关。对于 20 个边缘位错的阵列和平面晶界在大约 180 个原子间距上的运动，能量变化的大小在 Al 的一个位错线能量和 Cu 的六个的数量级上，这在两种情况下都很重要。此外，通过扫描 FCC 晶体的整个取向空间，结果表明，取向错误附近的晶界是在边缘位错上表现出最高吸引力的晶界之一。由于晶界迁移是由储存能量的减少驱动的，因此根据 FCC 金属中的实验再结晶数据对结果进行了分析，这些数据表明，移动最快的晶界通常以错取向轴为特征，错取向角接近 。