Abstract The present work addressed the effects of heat treatment on the mechanical response of a WE43 Mg alloy using an integrated framework of SEM-DIC experiment and CPFE simulation. Both macroscopic responses including yield strength, ultimate strength, ductility, and microscopic responses, including local displacement and strain maps, were experimentally investigated. The focus of this work is to use the CPFE simulation as an integrated computational tool to study the effects of heat treatment. The CPFE framework was evaluated using the local fields of displacement and strain obtained from the SEM-DIC experiment rather than the conventional scheme of using macroscopic responses at different loading directions. Subsequently, the information which is available using CPFE, such as the critical resolved shear stress (CRSS) and relative slip activity, was used to study the effects of heat treatment on the response of WE43 Mg alloy. The contributions of different strengthening mechanisms on the CRSS were addressed. The results show that effects of heat treatment can be captured using the predominant mechanisms of the grain size effect and the influence of precipitates. Finally, it has been shown that classical Hall-Petch in which one constant can capture the size effects, should be modified. To do so, each deformation mode should have a unique Hall-Petch constant, which are calculated here for the WE43 Mg alloy.

中文翻译：

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热处理对WE43镁合金响应的影响：晶体塑性有限元模拟和SEM-DIC实验

摘要 目前的工作使用 SEM-DIC 实验和 CPFE 模拟的集成框架解决了热处理对 WE43 镁合金机械响应的影响。实验研究了宏观响应，包括屈服强度、极限强度、延展性和微观响应，包括局部位移和应变图。这项工作的重点是使用 CPFE 模拟作为综合计算工具来研究热处理的影响。CPFE 框架是使用从 SEM-DIC 实验中获得的局部位移和应变场而不是在不同加载方向使用宏观响应的传统方案来评估的。随后，使用 CPFE 可获得的信息，例如临界分辨剪切应力 (CRSS) 和相对滑移活性，用于研究热处理对 WE43 镁合金响应的影响。讨论了不同加强机制对 CRSS 的贡献。结果表明，可以利用晶粒尺寸效应和析出物影响的主要机制来捕捉热处理的影响。最后，已经表明应该修改经典的 Hall-Petch，其中一个常数可以捕获尺寸效应。为此，每种变形模式都应具有唯一的 Hall-Petch 常数，此处针对 WE43 Mg 合金计算该常数。结果表明，可以利用晶粒尺寸效应和析出物影响的主要机制来捕捉热处理的影响。最后，已经表明应该修改经典的 Hall-Petch，其中一个常数可以捕获尺寸效应。为此，每种变形模式都应具有唯一的 Hall-Petch 常数，此处针对 WE43 Mg 合金计算该常数。结果表明，可以利用晶粒尺寸效应和析出物影响的主要机制来捕捉热处理的影响。最后，已经表明应该修改经典的 Hall-Petch，其中一个常数可以捕获尺寸效应。为此，每种变形模式都应具有唯一的 Hall-Petch 常数，此处针对 WE43 Mg 合金计算该常数。