镁合金板材有限的成形性能极大地限制了其在轻量化领域的广泛应用。而新型弱基面织构镁合金板材的开发使这一问题的解决成为可能，但是其塑性变形机制（位错滑移、孪生和晶界滑动）的演变规律尚未得到深入研究，使其优势未能得到充分挖掘。本项目拟以Mg-2Zn-0.1Ca合金板材为研究对象，在不同变形工艺条件下（温度：25~300℃和应变速率：1E-4~1E-2 s-1），针对具有不同材料特征参量（织构和晶粒尺寸）的板材，通过滑移迹线分析变形过程中滑移系激活规律的演变；并运用网格法计算局部应变（Green-Lagrange应变张量和von Mises应变）；再基于滑移系激活规律和局部应变研究各滑移系切应变的变化，同时研究孪生和晶界滑动的演变；最终阐明材料特征参量和变形工艺参数与镁合金板材复合变形机制演变规律的关系，深入理解上述两个关键因素对成形性能的影响机理，为镁合金板材成形性能的提升提供理论基础。

The poor formability of magnesium alloy sheet has restrained its wide use for light-weight applications. Fortunately, the development of advanced magnesium alloy sheet with weak basal texture makes it possible to handle this issue. However, the evolution of the deformation mechanisms, including dislocation slip, twinning and grain boundary sliding, during plastic deformation has not been fully investigated, which reduces its capability. The project aims on Mg-2Zn-0.1Ca sheets with various material features (texture and grain size). For different processing conditions (Temperature：25~300℃，strain rate ：1E-4~1E-2 s-1), to study the evolution of the activated slip systems according to slip trace analysis firstly; Then, to calculate the strain distribution based on Green-Lagrange strain tensor and von Mises strain; Thirdly, to study the change of the shear in each activated slip system based on the analysis of slip system activities and strain distribution; Furthermore, to analyze the evolution of twinning and grain boundary sliding; Eventually, to quantitatively investigate the correlation between the evolution of deformation mechanisms and material features and processing conditions, respectively. This work can contribute to a better understanding of the effects of these two key factors on formability, and provide theoretical fundamentals to enhance the formability of magnesium alloy sheet.