This work investigates the microstructure-property linkages in magnesium (Mg) with an emphasis on understanding interaction effects between the grain size, texture, and loading orientation. A single crystal plasticity framework endowed with experimentally informed micro Hall-Petch type relations for the activation thresholds for slip and twinning is adopted to resolve polycrystalline microstructures over a broad texture-grain size space. The macroscopic trends from the simulations corroborate with experiments. The synergistic effects of microstructural engineering on the micromechanical characteristics are mapped, which reveal their role in the emergent macroscopic behaviors. The simulations predict reduced extension twinning with grain size refinement even though the micro Hall-Petch coefficient for twinning is smaller than that for the non-basal slip modes. While grain refinement and textural weakening generally reduce the net plastic anisotropy and tension-compression asymmetry, the degree to which these macroscopic behaviors are tempered depends on the loading orientation. The results offer preliminary insight into the roles that texture and grain size may play in the damage behavior of engineered Mg microstructures.

这项工作研究了镁（Mg）中的微观结构-性能键，重点是了解晶粒尺寸，织构和加载方向之间的相互作用效应。采用单晶可塑性框架，该模型具有用于滑移和孪生的激活阈值的具有实验信息的微霍尔-帕奇类型关系，可在较宽的纹理粒度空间上解析多晶微观结构。模拟的宏观趋势与实验相符。绘制了微结构工程对微机械特性的协同效应，揭示了它们在出现的宏观行为中的作用。仿真结果表明，晶粒细化可减小延伸孪晶的产生，即使孪生的显微霍尔-Petch系数小于非基滑模的微观。虽然晶粒细化和质地减弱通常会减少净塑性各向异性和拉伸压缩不对称性，但这些宏观行为的回火程度取决于加载方向。结果为结构和晶粒尺寸在工程镁微结构的损伤行为中可能起的作用提供了初步的见识。