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<p>This study uses molecular dynamics simulations to investigate the combined effects of nanotwinned structures and elliptical vibration-assisted (EVA) cutting on the nanocutting behavior of FeNiCr alloy. By comparing single-crystal, nanotwinned, EVA single-crystal, and EVA nanotwinned systems, the interaction between twin-boundary constraint and vibration-induced dynamic unloading is clarified. The results show that nanotwinned structures increase cutting resistance by hindering dislocation motion and plastic flow, whereas EVA reduces the average cutting force by converting continuous tool–workpiece contact into periodic contact, unloading, and re-contact. The EVA nanotwinned system achieves a more favorable balance between force reduction and surface integrity than either strategy alone. In this coupled system, twin boundaries restrict excessive surface plastic deformation and defect propagation, while EVA alleviates local plastic blockage near twin boundaries and promotes more coordinated material flow. Surface roughness analysis shows that the EVA nanotwinned system has the lowest roughness, indicating improved machined surface quality. CNA and DXA results further reveal that plastic deformation is mainly governed by Shockley partial dislocation slip and stacking-fault formation, with no evident FCC–BCC phase transformation. These findings provide atomic-scale insight into the coupled regulation mechanism of nanotwinned structures and EVA cutting, and offer theoretical guidance for the ultraprecision machining of nanotwinned high-strength alloys.</p>

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Synergistic effects of nanotwins and elliptical vibration on nanocutting of FeNiCr alloy: A molecular dynamics study

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Jiqiang Cui,
  • Ruikang Zhang,
  • Shiguang Qiu

摘要

This study uses molecular dynamics simulations to investigate the combined effects of nanotwinned structures and elliptical vibration-assisted (EVA) cutting on the nanocutting behavior of FeNiCr alloy. By comparing single-crystal, nanotwinned, EVA single-crystal, and EVA nanotwinned systems, the interaction between twin-boundary constraint and vibration-induced dynamic unloading is clarified. The results show that nanotwinned structures increase cutting resistance by hindering dislocation motion and plastic flow, whereas EVA reduces the average cutting force by converting continuous tool–workpiece contact into periodic contact, unloading, and re-contact. The EVA nanotwinned system achieves a more favorable balance between force reduction and surface integrity than either strategy alone. In this coupled system, twin boundaries restrict excessive surface plastic deformation and defect propagation, while EVA alleviates local plastic blockage near twin boundaries and promotes more coordinated material flow. Surface roughness analysis shows that the EVA nanotwinned system has the lowest roughness, indicating improved machined surface quality. CNA and DXA results further reveal that plastic deformation is mainly governed by Shockley partial dislocation slip and stacking-fault formation, with no evident FCC–BCC phase transformation. These findings provide atomic-scale insight into the coupled regulation mechanism of nanotwinned structures and EVA cutting, and offer theoretical guidance for the ultraprecision machining of nanotwinned high-strength alloys.