Abstract AZ31 magnesium alloy sheets were prepared by a conventional extrusion (CE) and a novel integrated extrusion with side direction strain (SE). The microstructure characterizations, crystallographic texture and mechanical property tests were carried out and compared between the extruded Mg alloy sheets processed by CE and SE. The results indicated that the SE sheets exhibited an excellent combination of strength and ductility. To reveal the side strain effect, the finite element model was employed to investigate the effective stress and strain behavior of the AZ31 magnesium alloy sheets during CE and SE processes. It was found that the SE process was effective in weakening the stress and strain concentration. This implied that it developed an additional side direction strain through the sheet thickness during the hot extrusion. Meanwhile, the side strain shear paths could promote the local accumulation of dynamically recrystallized grains and increase the random high-angle boundaries to achieve weak (0002) basal texture. Important factors including the side strain path and extrusion parameters need to be taken into account to understand the deformation mechanism and microstructure evolution.

中文翻译：

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挤压AZ31板材在侧向应变下的力学行为和微观结构演变

摘要 AZ31 镁合金板材通过常规挤压（CE）和具有侧向应变（SE）的新型集成挤压制备。对经 CE 和 SE 加工的挤压镁合金板材进行显微组织表征、晶体织构和力学性能测试。结果表明，SE 片材表现出优异的强度和延展性组合。为了揭示侧应变效应，采用有限元模型来研究 AZ31 镁合金板在 CE 和 SE 过程中的有效应力和应变行为。结果表明，SE 工艺在减弱应力和应变集中方面是有效的。这意味着它在热挤压过程中通过板材厚度产生了额外的侧向应变。同时，侧应变剪切路径可以促进动态再结晶晶粒的局部积累并增加随机大角度边界以实现弱（0002）基底织构。需要考虑包括侧应变路径和挤压参数在内的重要因素，以了解变形机制和微观结构演变。