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<p>In this study, the shear deformation phenomena in pure copper during nanometric cutting were investigated through a combination of molecular dynamics (MD) simulations and nanometric cutting experiments. The simulation results revealed that the stacking fault (SF) formation and localized amorphous phase transitions occurred in pure copper. These observed deformation features were attributed to the development of high localized shear strain during the cutting process. The variation in SFs produced along different crystallographic orientations were found to originate from disparities in the shear stress distribution within the face-centered cubic (FCC) slip systems. Further analysis, based on the radial distribution function (RDF) and potential energy visualization, revealed that the formation of subsurface amorphous clusters is driven by local strain energy reaching the threshold required for amorphization. Nanometric cutting experiments and transmission electron microscopy (TEM) characterization confirmed the presence of subsurface point-like amorphous clusters and SFs. This study provides a valuable reference for elucidating the shear deformation mechanisms and offers theoretical guidance for amorphization of pure metallic materials.</p>

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The Role of Shear Deformation in Localized Amorphization During Nanometric Cutting of Pure Copper

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Hui Wang,
  • Zhimin Cao,
  • Chunlei He

摘要

In this study, the shear deformation phenomena in pure copper during nanometric cutting were investigated through a combination of molecular dynamics (MD) simulations and nanometric cutting experiments. The simulation results revealed that the stacking fault (SF) formation and localized amorphous phase transitions occurred in pure copper. These observed deformation features were attributed to the development of high localized shear strain during the cutting process. The variation in SFs produced along different crystallographic orientations were found to originate from disparities in the shear stress distribution within the face-centered cubic (FCC) slip systems. Further analysis, based on the radial distribution function (RDF) and potential energy visualization, revealed that the formation of subsurface amorphous clusters is driven by local strain energy reaching the threshold required for amorphization. Nanometric cutting experiments and transmission electron microscopy (TEM) characterization confirmed the presence of subsurface point-like amorphous clusters and SFs. This study provides a valuable reference for elucidating the shear deformation mechanisms and offers theoretical guidance for amorphization of pure metallic materials.