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<p>In the work, the microstructure evolution and deformation mechanism of TA2 pure titanium under quasi-static compression are studied by quasi-in situ electron backscattered diffraction (EBSD) technology at room temperature. By tracking the same locations associated with cumulative strain increments, the dynamic evolution process of twinning is distinctly disclosed. According to the experimental results, twins are activated only in a few grains during the compression process. The main types of twins are {11-22} twins and {11-22}-{10-12} secondary twins. The formation of most {11-22} twins obeys Schmid law, however, the local high strain caused by dislocation slip within primary twins activates negative Schmid factor (<i>SF</i>) secondary twins. In addition, the grains with activated twins are surrounded by most grains with no twins, and prismatic slip dominated deformation in grains with no twins by using in-grain misorientation axes (IGMA) method analysis. Furthermore, geometric compatibility factor (<i>m</i>′) between {11-22} twins in matrix grain and five deformation modes in adjacent grains is calculated. It is found that prismatic slip can better adapt to the shear generated by {11-22} twins and intergranular deformation.</p>

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Microstructure Evolution and Deformation Mechanism of TA2 Pure Titanium during Quasi In Situ Compression

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Xinyue Wang,
  • Pingli Mao,
  • Ziqi Wei,
  • Haowei Yi,
  • Pengyu Wang,
  • Xiaoxu Wu,
  • Feng Wang,
  • Zhi Wang,
  • Le Zhou

摘要

In the work, the microstructure evolution and deformation mechanism of TA2 pure titanium under quasi-static compression are studied by quasi-in situ electron backscattered diffraction (EBSD) technology at room temperature. By tracking the same locations associated with cumulative strain increments, the dynamic evolution process of twinning is distinctly disclosed. According to the experimental results, twins are activated only in a few grains during the compression process. The main types of twins are {11-22} twins and {11-22}-{10-12} secondary twins. The formation of most {11-22} twins obeys Schmid law, however, the local high strain caused by dislocation slip within primary twins activates negative Schmid factor (SF) secondary twins. In addition, the grains with activated twins are surrounded by most grains with no twins, and prismatic slip dominated deformation in grains with no twins by using in-grain misorientation axes (IGMA) method analysis. Furthermore, geometric compatibility factor (m′) between {11-22} twins in matrix grain and five deformation modes in adjacent grains is calculated. It is found that prismatic slip can better adapt to the shear generated by {11-22} twins and intergranular deformation.