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<p>To investigate the formation mechanism of adiabatic shear bands (ASB) in fine-grained AZ31 magnesium alloy under dynamic loading, this study employed a split Hopkinson pressure bar (SHPB) to conduct dynamic compression at a strain rate of 1200&#xa0;s<sup>−1</sup> and a temperature of 200&#xa0;°C. The microstructure and texture were characterized using EBSD, and the deformation mechanisms were analyzed with the VPSC-DRX model. The results show that the ASB width is narrow, with fine grain sizes and dispersed orientations, and a significant increase in the proportion of equiaxed grains with large-angle grain boundaries. The main texture shifts from the ED to the ERD direction from the non-ASB region to the ASB region. During this process, the primary deformation mechanism is prismatic slip, with its activity consistent with the trends in strain and stress variations. The dynamic recrystallization mechanism during ASB formation is identified as continuous dynamic recrystallization.</p>

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Study on the Formation Mechanism of Adiabatic Shear Bands in Fine-Grained AZ31 Magnesium Alloy Based on the VPSC-DRX Model

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Tianyu Cui,
  • Yue Zhang,
  • Xuanyu Liu,
  • Tuo Gai,
  • Pingli Mao

摘要

To investigate the formation mechanism of adiabatic shear bands (ASB) in fine-grained AZ31 magnesium alloy under dynamic loading, this study employed a split Hopkinson pressure bar (SHPB) to conduct dynamic compression at a strain rate of 1200 s−1 and a temperature of 200 °C. The microstructure and texture were characterized using EBSD, and the deformation mechanisms were analyzed with the VPSC-DRX model. The results show that the ASB width is narrow, with fine grain sizes and dispersed orientations, and a significant increase in the proportion of equiaxed grains with large-angle grain boundaries. The main texture shifts from the ED to the ERD direction from the non-ASB region to the ASB region. During this process, the primary deformation mechanism is prismatic slip, with its activity consistent with the trends in strain and stress variations. The dynamic recrystallization mechanism during ASB formation is identified as continuous dynamic recrystallization.