A dislocation-based crystal plasticity simulation on kink band formation in single crystal of Mg-Based LPSO phase
A dislocation-based crystal plasticity simulation on kink band formation in single crystal of Mg-Based LPSO phase
复制标题
基于位错的晶体塑性模拟镁基 LPSO 相单晶扭结带形成
DOI：
10.2472/jsms.64.295
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
K. Shizawa
中科院分区：
文献类型：
--
作者：
Ryo Ueta;K. Shizawa
在本研究中，我们使用基于位错的HCP晶体塑性模型，对镁基LPSO相的单晶进行了二维有限元模拟，以计算再现LPSO相中的变形扭结。我们只考虑了基滑系统的活动，其cross被设置为与LPSO相的实验结果一致。此外，还引入了沿a轴优先生长的LPSO晶体的特征形状。由于需要考虑一些初始缺陷来数值表达变形扭结等屈曲现象，我们假设加载方向的基面倾角较小作为初始晶体取向。此外，我们将r最小滑移增量法应用于计算的稳定性分析。通过模拟，我们通过GN位错的积累、偏斜和晶格旋转来预测扭结带的形成。通过将所得结果与基于位错行为的扭结形成的已知定性解释进行比较，讨论了该模型的有效性。因此，我们得出结论，扭结带是由局部基底滑移迅速形成的。
In this study, two-dimensional FE simulations for a single crystal of a Mg-based LPSO phase are performed to computationally reproduce a deformation kink in the LPSO phase using a dislocation-based crystal plasticity model for HCP crystals developed in our previous work. We take account of activities of only basal slip systems of which CRSSes are set to be consistent with the experimental results on the LPSO phase. In addition, the characteristic shape of the LPSO crystal caused by preferential growth along the a -axis is introduced into the specimen. Since we need to consider some initial imperfection to numerically express a buckling phenomenon such as the deformation kink, we assume a small inclination of the basal plane for the loading direction as the initial crystal orientation. Moreover, we apply r min method for the slip increment to the analysis for stability of calculation. As a result of this simulation, we predict the kink band formation computationally through the accumulation of GN dislocation, disclination and the crystal lattice rotation. The validity of the present model is discussed by comparing obtained results with a well-known explanation for kink formation based on dislocation behaviors qualitatively. Then we conclude that the kink band is rapidly formed by localized basal slips.
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DOI：
--
发表时间：
2004
期刊：
Keikinzoku/Journal of Japan Institute of Light Metals 54
影响因子：
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DOI：
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发表时间：
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期刊：
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