Crystal plasticity analysis of texture development in magnesium alloy during extrusion
Crystal plasticity analysis of texture development in magnesium alloy during extrusion
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DOI：
10.1016/j.ijplas.2011.02.007
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发表时间：
2011-12-01
影响因子：
9.8
通讯作者：
Kuroda, Mitsutoshi
中科院分区：
文献类型：
--
作者：
Mayama, Tsuyoshi;Noda, Masafumi;Kuroda, Mitsutoshi
采用实验观察和数值分析相结合的方法，研究了镁合金挤压过程中织构的形成机理。首先，我们进行了有限元分析的一个完整的挤压过程中使用的唯象本构方程，它被证实，挤压过程中的加载条件附近的中心轴的坯料是近似的等双轴压缩模式。然后，采用等双轴压缩问题作为一个简化的边界值问题，使用晶体塑性模型来解决，以澄清详细的织构发展机制在挤压过程中。等双轴压缩的晶体塑性分析成功地再现了从初始随机织构到最终实验观察到的织构的织构发展。详细研究了变形模式（即滑移和孪生系统）在计算中的实施和基准应力比的基础上的纹理发展的非基础滑移系统的影响。最后，从激活滑移系引起的晶格旋转角度讨论了挤压过程中织构的形成机理。(C)2011爱思唯尔有限公司版权所有。
The texture development mechanism during the extrusion of magnesium alloy is investigated by experimental observation and numerical analysis. First, we perform a finite element analysis of a full extrusion process using a phenomenological constitutive equation, and it is confirmed that the loading condition of the extrusion process near the central axis of the billet is approximated by an equi-biaxial compression mode. Then, the equi-biaxial compression problem is adopted as a simplified boundary value problem to be solved using a crystal plasticity model to clarify the detailed texture development mechanism during the extrusion process. The crystal plasticity analysis of equi-biaxial compression successfully reproduces the texture development from an initial random texture to the final experimentally observed texture. The effects of the deformation modes (i.e. slip and twinning systems) implemented in the calculation and the reference stress ratio of basal to nonbasal slip systems on texture development are studied in detail. Finally, the mechanism of texture development during the extrusion process is discussed in terms of the lattice rotation caused by the activated slip systems. (C) 2011 Elsevier Ltd. All rights reserved.