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<p>The in situ electron backscatter diffraction (EBSD) is used to study the microstructure and texture evolution, twinning behavior and selection of twin variants under two different loading modes at room temperature. Tension along the C-axis or compression along the basal plane is the favored loading modes for extension twin. Compared with tension along the ERD (along the C-axis), when compression along the ED (along the basal plane), twins are more likely to nucleate, grow or even be completely twinning, and the overall growth rate of the twinning region is higher, which also leads to stronger texture deflection. Extension twin has six equivalent twin variants; the selection of twin variants is related to the loading direction and the activation of the twin variant or variants in all two samples following the Schmid factor (SF) law; twin variants with relatively high SF are supposed to activate. The activation of a few low SF twins is related to the local stress field of grains or adjacent grains and is activated to coordinate the deformation. When compression along ED, the SF of six variants is quite different, and one variant with relatively high SF is mainly activated in a single grain, while tension along ERD is beneficial to the activation of multiple twin variants in a single grain.</p>

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Effect of loading modes on extension twinning behavior in AZ31 Mg alloy by in situ observation

  • 期刊论文

  • 发表日期：

    2025年1月8日

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  • Haowei Yi,
  • Ziqi Wei,
  • Pingli Mao,
  • Le Zhou,
  • Zhi Wang,
  • Feng Wang,
  • Ning Xu,
  • Pengyu Wang,
  • Zheng Liu

摘要

The in situ electron backscatter diffraction (EBSD) is used to study the microstructure and texture evolution, twinning behavior and selection of twin variants under two different loading modes at room temperature. Tension along the C-axis or compression along the basal plane is the favored loading modes for extension twin. Compared with tension along the ERD (along the C-axis), when compression along the ED (along the basal plane), twins are more likely to nucleate, grow or even be completely twinning, and the overall growth rate of the twinning region is higher, which also leads to stronger texture deflection. Extension twin has six equivalent twin variants; the selection of twin variants is related to the loading direction and the activation of the twin variant or variants in all two samples following the Schmid factor (SF) law; twin variants with relatively high SF are supposed to activate. The activation of a few low SF twins is related to the local stress field of grains or adjacent grains and is activated to coordinate the deformation. When compression along ED, the SF of six variants is quite different, and one variant with relatively high SF is mainly activated in a single grain, while tension along ERD is beneficial to the activation of multiple twin variants in a single grain.