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<p>In this research, laser shock peening (LSP) technology was used to investigate the effect of micro-impact on twin gradient structure and surface hardening of magnesium single crystal. Under LSP of 4&#xa0;J, a large number of the micro-twins are nucleated in the impacted single-crystal surface, indicating that {10-12} twin nucleation dominates twinning deformation to accommodate localized strain accumulation caused by micro-impact. The significant twin gradient structure is generated in the single crystal subjected to LSP with the overlap ratio of 50% and the laser energy of 4&#xa0;J. In the impact-depth range from 0 to 500&#xa0;μm, a great number of micro-twins are nucleated to deal with the fast deformation of the surface under high-energy shock; with the impact depth increasing, the growth of the existing twins gradually becomes predominant to accommodate the plastic strain. The micro-twin structure caused by LSP with the overlap ratio of 50% and the laser energy of 4&#xa0;J leads to higher surface nano-hardness. For single crystal, the activated twins act as the primary structures hindering the dislocation motion and facilitating the formation of high-density GNDs. During LSP, the impact compressions of ultra-high strain rate at the microscale facilitate rapid twinning rearrangement of atomic positions and slip dislocation pileup in the single crystal. So, the difficult fast reaction between dislocation and TB might result in that slip dislocations which are mostly hindered on twin structure.</p>

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{10-12} Twin Gradient Structure and Surface-Hardening Behavior of Magnesium Single Crystal under Laser Shock Peening

  • 期刊论文

  • 发表日期：

    2026年4月25日

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  • Chao Lou,
  • Ting Hu,
  • Fan Zhang,
  • Fenglei Zhang,
  • Yi Ren,
  • Qingshan Yang,
  • Bo Song

摘要

In this research, laser shock peening (LSP) technology was used to investigate the effect of micro-impact on twin gradient structure and surface hardening of magnesium single crystal. Under LSP of 4 J, a large number of the micro-twins are nucleated in the impacted single-crystal surface, indicating that {10-12} twin nucleation dominates twinning deformation to accommodate localized strain accumulation caused by micro-impact. The significant twin gradient structure is generated in the single crystal subjected to LSP with the overlap ratio of 50% and the laser energy of 4 J. In the impact-depth range from 0 to 500 μm, a great number of micro-twins are nucleated to deal with the fast deformation of the surface under high-energy shock; with the impact depth increasing, the growth of the existing twins gradually becomes predominant to accommodate the plastic strain. The micro-twin structure caused by LSP with the overlap ratio of 50% and the laser energy of 4 J leads to higher surface nano-hardness. For single crystal, the activated twins act as the primary structures hindering the dislocation motion and facilitating the formation of high-density GNDs. During LSP, the impact compressions of ultra-high strain rate at the microscale facilitate rapid twinning rearrangement of atomic positions and slip dislocation pileup in the single crystal. So, the difficult fast reaction between dislocation and TB might result in that slip dislocations which are mostly hindered on twin structure.