A crystal plasticity investigation of grain size-texture interaction in magnesium alloys
A crystal plasticity investigation of grain size-texture interaction in magnesium alloys
复制标题
镁合金晶粒尺寸-织构相互作用的晶体塑性研究
DOI：
10.1016/j.actamat.2021.116743
复制
发表时间：
2021
期刊：
影响因子：
9.4
通讯作者：
Joshi, Shailendra P.
中科院分区：
文献类型：
--
作者：
Ravaji, Babak;Joshi, Shailendra P.
本文研究了镁（Mg）的微观结构与性能的联系，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。采用单晶塑性框架，在广泛的织构-晶粒尺寸空间内解析多晶微观结构，该框架具有具有实验信息的微观Hall-Petch型关系，用于滑移和孪生的激活阈值。模拟得到的宏观趋势与实验结果相吻合。绘制了微观结构工程对细观力学特性的协同效应，揭示了它们在涌现的宏观行为中的作用。模拟结果表明，随着晶粒尺寸的细化，孪晶的微观霍尔-佩奇系数小于非基滑移模式的微观霍尔-佩奇系数。晶粒细化和织构弱化通常会降低净塑性各向异性和拉压不对称性，但这些宏观行为的回火程度取决于加载方向。研究结果初步揭示了织构和晶粒尺寸对工程镁合金显微组织损伤行为的影响。
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.