$\left\{10\overline{1}2\right\}$ twins were introduced into the magnesium (Mg) plate AZ31 via pre-rolling along its transverse direction. The plates, both with and without the pre-induced $\left\{10\overline{1}2\right\}$ twins, were subjected to uniaxial tension along different directions. Using crystal plasticity modeling, we found that the strengthening effect of the pre-induced $\left\{10\overline{1}2\right\}$ twins on the macroscopic flow stress primarily arised from the increased slip resistance caused by the boundaries, rather than the orientation hardening due to the twinning reorientation (although the latter did make its contribution in some specific loading directions). Besides, the pre-existing $\left\{10\overline{1}2\right\}$ twins were found, by both experiments and simulation, to promote the activity of prismatic 〈a〉 and pyramidal <c + a> in the parent matrix of the material. Further analysis showed that the enhanced non-basal slip activity is related to the $\left\{10\overline{1}2\right\}$ twin boundaries' low micro Hall-Petch slope ratios of non-basal slips to basal slip. With the critical resolved shear stress (CRSS) obtained from crystal plasticity modeling and the orientation data from EBSD, a probability-based slip transfer model was proposed. The model predicts higher slip transfer probabilities and thus lower strain concentration tendencies at $\left\{10\overline{1}2\right\}$ twin boundaries than that at grain boundaries, which agrees with the experimental observation that the strain localization was primarily associated with the latter. The present findings are helpful scientifically, in deepening our understanding of how the pre-induced $\left\{10\overline{1}2\right\}$ twins affect the strength and slip activity of Mg alloys, and technologically, in guiding the design of the pre-strain protocol of Mg alloys.

$\left\{10\overline{\mathrm{1个}}\mathrm{2个}\right\}$通过沿横向预轧制将孪晶引入镁 (Mg) 板 AZ31 中。有和没有预诱导的板$\left\{10\overline{\mathrm{1个}}\mathrm{2个}\right\}$双胞胎，受到沿不同方向的单轴张力。使用晶体塑性建模，我们发现预诱导的强化效果$\left\{10\overline{\mathrm{1个}}\mathrm{2个}\right\}$双胞胎对宏观流变应力的影响主要来自边界引起的滑移阻力增加，而不是由于孪晶再取向引起的取向硬化（尽管后者确实在某些特定的加载方向上做出了贡献）。此外，已有的$\left\{10\overline{\mathrm{1个}}\mathrm{2个}\right\}$通过实验和模拟，发现双胞胎可以促进材料母体中棱柱体 <a> 和金字塔体 <c + a> 的活性。进一步分析表明，增强的非基础滑移活动与$\left\{10\overline{\mathrm{1个}}\mathrm{2个}\right\}$双边界的非基底滑动与基底滑动的低微 Hall-Petch 坡度比。利用从晶体塑性建模获得的临界分解剪切应力 (CRSS) 和 EBSD 的取向数据，提出了基于概率的滑移传递模型。该模型预测更高的滑移转移概率，从而降低应变集中趋势$\left\{10\overline{\mathrm{1个}}\mathrm{2个}\right\}$双晶界比晶界处的晶界，这与应变局部化主要与后者相关的实验观察结果一致。目前的研究结果在科学上是有帮助的，有助于加深我们对如何预诱导$\left\{10\overline{\mathrm{1个}}\mathrm{2个}\right\}$双胞胎影响镁合金的强度和滑移活性，并在技术上指导镁合金预应变方案的设计。