Orientation image-based micromechanical modelling of subgrain texture evolution in polycrystalline copper
Orientation image-based micromechanical modelling of subgrain texture evolution in polycrystalline copper
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DOI：
10.1016/j.actamat.2008.04.016
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发表时间：
2008-09
期刊：
影响因子：
9.4
通讯作者：
R. Lebensohn;R. Brenner;O. Castelnau;A. Rollett
中科院分区：
文献类型：
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作者：
R. Lebensohn;R. Brenner;O. Castelnau;A. Rollett
将基于快速傅里叶变换（FFTs）的多晶粘塑性变形预测的高效全场公式应用于多晶Cu在拉伸变形下的亚晶织构和微观组织演变研究。定向成像显微镜（OIM）图像的直接输入用于初始单元细胞的构建。11%拉伸应变后预测的平均取向和取向偏差与OIM测量结果直接比较，结果吻合较好。估计了表面晶粒与体积晶粒的取向偏差差异，并研究了晶粒内部取向偏差的取向依赖关系。实测结果与模拟结果一致，表明初始取向< 110 >附近的晶粒倾向于发展出较高的取向偏差。这种行为可以用两个稳定取向的相互吸引和晶粒相互作用来解释。只有明确考虑到单个颗粒之间相互作用的模型，如基于fft的公式，才能捕捉到这些影响。
An efficient full-field formulation based on fast Fourier transforms (FFTs) for the prediction of the viscoplastic deformation of polycrystals is applied to the study of the subgrain texture and microstructure evolution in polycrystalline Cu deformed under tension. Direct input from orientation imaging microscopy (OIM) images is used in the construction of the initial unit cell. Average orientations and misorientations predicted after 11% tensile strain are directly compared with OIM measurements, showing good agreement. The differences between misorientations of surface grains compared with bulk grains are estimated, and the orientation dependence of intragranular misorientations is studied. Measurements and simulations agree in that grains with initial orientation near 〈110〉 tend to develop higher misorientations. This behavior can be explained in terms of attraction towards the two stable orientations and grain interaction. Only models that account explicitly for interaction between individual grains, like the FFT-based formulation, are able to capture these effects.