Abstract The elastic visco-plastic self-consistent model with the twinning and detwinning scheme, in conjunction with a torsion specific finite element approach, is employed to model the deformation behavior of magnesium alloy AZ31 solid rod with different initial textures, including ideal basal, rolled, extruded, and random. Besides the loading with nearly homogenous deformation (tension and compression), loading paths with inhomogeneous deformation are investigated particularly under free-end and fixed-end torsions. Simulation reveals that the deformation mechanisms alter significantly with varying the different initial textures and different loading paths, leading to variances in stress-strain response, Swift effect, and deformation texture. In particular, our crystal plasticity model well captures the inhomogeneous distributions of internal stress and twin volume fraction within the solid rod under torsion. This is particularly significant as our torsion-specific crystal plasticity model provides a numerical tool that can be used to tune gradient twin structures via torsion of solid rod to improve the mechanical properties of magnesium alloy.

中文翻译：

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织构和孪晶对镁合金实心棒扭转行为的影响：与单轴拉伸/压缩相比的晶体塑性方法

摘要 具有孪生和解孪方案的弹性粘塑性自洽模型，结合扭转特定有限元方法，用于模拟具有不同初始织构（包括理想基面、轧制）的镁合金 AZ31 实心棒的变形行为。 、挤压和随机。除了几乎均匀变形（拉伸和压缩）的加载外，还研究了非均匀变形的加载路径，特别是在自由端和固定端扭转下。模拟表明，变形机制随着不同的初始纹理和不同的加载路径发生显着变化，导致应力应变响应、Swift 效应和变形纹理的变化。特别是，我们的晶体塑性模型很好地捕捉了扭转下实心棒内内应力和孪晶体积分数的不均匀分布。这一点尤其重要，因为我们的扭转特定晶体塑性模型提供了一种数值工具，可用于通过实心棒的扭转来调整梯度孪晶结构，以改善镁合金的机械性能。