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<p>In this study, the effects of temperature on the mechanical properties and microstructural evolution of AZ31B magnesium alloy sheets were investigated through uniaxial tensile experiments conducted at various temperatures, combined with crystal plasticity finite element modeling (CPFEM). The calibrated CPFE model successfully reproduced the tensile behavior along both the rolling and transverse directions, enabling the determination of constitutive parameters at different temperatures. The results show that increasing temperature leads to a moderate decrease in the critical resolved shear stress (CRSS) of basal slip (from 12&#xa0;MPa at 25 °C to 1&#xa0;MPa at 200 °C), whereas prismatic and pyramidal &lt; a &gt; slip systems exhibit a much more pronounced reduction in CRSS (from 78&#xa0;MPa at 25 °C to 25&#xa0;MPa at 200 °C). The pyramidal &lt; c + a &gt; slip system experiences an even stronger reduction, decreasing from 130 to 45&#xa0;MPa over the same temperature range. In contrast, both tension and compression twinning become progressively harder to activate, as reflected by the increase in their CRSS values. Furthermore, according to the activation condition of different deformation mechanisms, we found that prismatic slip dominates the uniaxial tensile deformation of AZ31B magnesium alloy sheets at temperatures between 25 °C and 200 °C. Orientation-tracking analysis further shows that, during deformation, the grain c-axes rotate progressively toward the sheet normal direction, while the basal planes rotate around the c-axis toward their equilibrium positions. This coordinated rotation compresses the (0002) basal texture along the rolling direction and modifies the characteristic sixfold intensity distribution in the pole figure. Schmid factor analysis further clarifies the orientation-dependent activation conditions of slip and twinning systems, providing mechanistic insight into the temperature-governed plasticity and texture evolution in AZ31B magnesium alloy sheets.</p>

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Deformation mechanisms in AZ31B magnesium alloy from room to medium temperatures via crystal plasticity modelling and theoretical calculations

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Wei Zheng,
  • Jingzhao Wu,
  • Haolong Bai,
  • Guanghan Dang,
  • Yong Kang,
  • Liang Chen,
  • Juanjuan Han

摘要

In this study, the effects of temperature on the mechanical properties and microstructural evolution of AZ31B magnesium alloy sheets were investigated through uniaxial tensile experiments conducted at various temperatures, combined with crystal plasticity finite element modeling (CPFEM). The calibrated CPFE model successfully reproduced the tensile behavior along both the rolling and transverse directions, enabling the determination of constitutive parameters at different temperatures. The results show that increasing temperature leads to a moderate decrease in the critical resolved shear stress (CRSS) of basal slip (from 12 MPa at 25 °C to 1 MPa at 200 °C), whereas prismatic and pyramidal < a > slip systems exhibit a much more pronounced reduction in CRSS (from 78 MPa at 25 °C to 25 MPa at 200 °C). The pyramidal < c + a > slip system experiences an even stronger reduction, decreasing from 130 to 45 MPa over the same temperature range. In contrast, both tension and compression twinning become progressively harder to activate, as reflected by the increase in their CRSS values. Furthermore, according to the activation condition of different deformation mechanisms, we found that prismatic slip dominates the uniaxial tensile deformation of AZ31B magnesium alloy sheets at temperatures between 25 °C and 200 °C. Orientation-tracking analysis further shows that, during deformation, the grain c-axes rotate progressively toward the sheet normal direction, while the basal planes rotate around the c-axis toward their equilibrium positions. This coordinated rotation compresses the (0002) basal texture along the rolling direction and modifies the characteristic sixfold intensity distribution in the pole figure. Schmid factor analysis further clarifies the orientation-dependent activation conditions of slip and twinning systems, providing mechanistic insight into the temperature-governed plasticity and texture evolution in AZ31B magnesium alloy sheets.