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<p>Twinning is a critical plastic deformation mechanism in zirconium (Zr) alloys. This study systematically investigates the dynamic evolution of {10–12} tensile twinning in a Zr-4 alloy subjected to transverse uniaxial compression using <i>in situ</i> electron backscatter diffraction (EBSD). The results reveal that twin activation is dominated by crystallographic orientation of parent grains. Primary twin variant selection follows the Schmid factor, whereas the geometric compatibility factor (m′) governs the activation of non-Schmid variants and facilitates intergranular twin transmission. Intragranular twinning preferentially involves same-type variants with small misorientations, while a strong basal texture promotes continuous intergranular transmission and chain-like twin formation. Twin growth, lateral thickening, and coalescence are driven by localized strain accumulation but constrained by grain-boundary misorientation. A critical misorientation angle of ~ 30° is identified, above which twin transmission and parent-grain consumption become statistically less probable.</p> Graphical Abstract <p></p>

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Orientation-dominated {10–12} twinning mechanisms in Zr-4 alloy: From twin chain formation to boundary migration

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Zhongbo Hu,
  • Shuang Chen,
  • Bin Zhang,
  • Wenqiang Zhang,
  • Xianjue Ye,
  • Yuefei Zhang

摘要

Twinning is a critical plastic deformation mechanism in zirconium (Zr) alloys. This study systematically investigates the dynamic evolution of {10–12} tensile twinning in a Zr-4 alloy subjected to transverse uniaxial compression using in situ electron backscatter diffraction (EBSD). The results reveal that twin activation is dominated by crystallographic orientation of parent grains. Primary twin variant selection follows the Schmid factor, whereas the geometric compatibility factor (m′) governs the activation of non-Schmid variants and facilitates intergranular twin transmission. Intragranular twinning preferentially involves same-type variants with small misorientations, while a strong basal texture promotes continuous intergranular transmission and chain-like twin formation. Twin growth, lateral thickening, and coalescence are driven by localized strain accumulation but constrained by grain-boundary misorientation. A critical misorientation angle of ~ 30° is identified, above which twin transmission and parent-grain consumption become statistically less probable.

Graphical Abstract