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<p><i>γ-</i>TiAl alloy has emerged as a promising next-generation high-temperature structural material in the aerospace and automotive industries due to its low density and excellent high-temperature strength. However, its room-temperature brittleness often leads to machining-induced microcracks and residual stress, significantly limiting its practical engineering applications. To investigate the improvement mechanism of laser-assisted machining on the machining quality of <i>γ</i>-TiAl alloy, this study employed molecular dynamics simulations to systematically examine the influence of laser power parameters on cutting forces, surface integrity, and subsurface defect evolution. The simulation results revealed that within an appropriate laser power range, increasing the laser power facilitated plastic deformation in <i>γ</i>-TiAl alloy, reducing cutting forces, improving surface morphology, and decreasing stacking faults and dislocation density. However, when the laser power reached 100&#xa0;eV/ps, the low thermal conductivity of <i>γ</i>-TiAl alloy led to non-uniform stress distribution in the subsurface deformation zone, resulting in severe work hardening and a pronounced conical subsurface damage protrusion at the workpiece edge. These findings enhanced the understanding of the nanocutting mechanism of <i>γ</i>-TiAl alloy and provided a theoretical basis for optimizing laser-assisted machining parameters at the nanoscale.</p>

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Atomic Insights into the Material Removal Mechanism of γ-TiAl Alloy During Laser-Assisted Machining Via Molecular Dynamics Simulations

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Bing Liu,
  • Wenjie Zhang,
  • Fei Ren,
  • Yibin Ci,
  • Yafei He

摘要

γ-TiAl alloy has emerged as a promising next-generation high-temperature structural material in the aerospace and automotive industries due to its low density and excellent high-temperature strength. However, its room-temperature brittleness often leads to machining-induced microcracks and residual stress, significantly limiting its practical engineering applications. To investigate the improvement mechanism of laser-assisted machining on the machining quality of γ-TiAl alloy, this study employed molecular dynamics simulations to systematically examine the influence of laser power parameters on cutting forces, surface integrity, and subsurface defect evolution. The simulation results revealed that within an appropriate laser power range, increasing the laser power facilitated plastic deformation in γ-TiAl alloy, reducing cutting forces, improving surface morphology, and decreasing stacking faults and dislocation density. However, when the laser power reached 100 eV/ps, the low thermal conductivity of γ-TiAl alloy led to non-uniform stress distribution in the subsurface deformation zone, resulting in severe work hardening and a pronounced conical subsurface damage protrusion at the workpiece edge. These findings enhanced the understanding of the nanocutting mechanism of γ-TiAl alloy and provided a theoretical basis for optimizing laser-assisted machining parameters at the nanoscale.