Simulating the evolution of microstructures and the mechanical response of alloys with cubic and hcp structures is crucial for the industrial manufacturing of key alloy components. In this work, a modified Voce (ME-Voce) model is proposed, based on the extended Voce hardening model, to depict the variations of hardening rate with cumulative shear strain. Also, an orientation-dependent weight that describes the neighboring grain-induced ‘drag’ effect is evaluated. These improvements are numerically implemented in a standard viscoplastic self-consistent (VPSC) model. The ME-Voce parameters are determined through multi-parameter optimization using Matlab software. The influences of grain shape and neighboring grains on the hot deformation behavior of alloys are investigated. The proposed ME-Voce model is validated through hot compression experiments of alloys with cubic and hcp structures. The results show the VPSC embedded in the ME-Voce can reasonably predict the mechanical response under different deformation conditions. This enhances the predictive capability of the VPSC model and provides more options for crystal plasticity simulation of alloys with different crystal structures.

中文翻译：

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使用自洽多晶塑性方法精确模拟立方和六方结构合金的织构演化和力学响应

模拟立方结构和六方立方结构合金的微观结构演变和机械响应对于关键合金部件的工业制造至关重要。在这项工作中，基于扩展的 Voce 硬化模型，提出了一种改进的 Voce (ME-Voce) 模型，以描述硬化率随累积剪切应变的变化。此外，还评估了描述相邻颗粒引起的“阻力”效应的方向相关权重。这些改进在标准粘塑性自洽 (VPSC) 模型中以数值方式实现。 ME-Voce参数是使用Matlab软件通过多参数优化确定的。研究了晶粒形状和相邻晶粒对合金热变形行为的影响。所提出的 ME-Voce 模型通过立方和 hcp 结构合金的热压缩实验进行了验证。结果表明，ME-Voce 中嵌入的 VPSC 可以合理预测不同变形条件下的机械响应。这增强了VPSC模型的预测能力，为不同晶体结构合金的晶体塑性模拟提供了更多选择。