Crystal plasticity finite element modelling of the extrusion texture of a magnesium alloy
Crystal plasticity finite element modelling of the extrusion texture of a magnesium alloy
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DOI：
10.1088/0965-0393/23/5/055011
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发表时间：
2015-06
影响因子：
1.8
通讯作者：
Yichuan Shao;Tao Tang;Dayong Li;Weiqin Tang;Ying-hong Peng
中科院分区：
文献类型：
--
作者：
Yichuan Shao;Tao Tang;Dayong Li;Weiqin Tang;Ying-hong Peng
本文建立了模拟AZ31镁合金热挤压织构的晶体塑性有限元模型。晶体塑性模型通过用户界面VUMAT子程序在ABAQUS™中实现。采用弹塑性自洽（EPSC）模型作为基本的多晶框架来模拟挤压过程中的滑移和孪晶。此外，该框架扩展到考虑动态再结晶（DRX）晶粒对挤压织构的影响。实验测量的纹理与模拟的纹理吻合较好。模拟结果表明，在< 11.0 > ？> ||挤压方向（ED）可归因于DRX晶粒形成过程中晶格绕c轴旋转。此外，施加在挤压材料上的剪切应变通过增强基底< a bb0 ？当物料通过挤出口时，>滑移模式。
In this paper, a crystal plasticity finite-element model (CPFEM) is developed to simulate the hot extrusion texture of the magnesium alloy AZ31. The crystal plasticity model is implemented in ABAQUS™ via user interface VUMAT subroutine. The elasto-plastic self-consistent (EPSC) model is used as the basic polycrystal framework to simulate the slip and twinning during the extrusion. Furthermore, this framework is extended to account for the effects of the dynamically recrystallized (DRX) grains on the extrusion textures. Good agreement is found between the experimentally measured and simulated textures. The simulation results show that the presence of a secondary texture component around 〈11.0〉 ?> || extrusion direction (ED) can be attributed to the lattice rotation around the c-axis during the formation of the DRX grains. In addition, the shear strain imposed on the extruded material affects the resulting texture by enhancing the basal 〈a〉 ?> slip mode as the material passes through the extrusion opening.