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<p>The instability of nanograined metals and the degradation of their mechanical properties primarily arise from pronounced grain boundary (GB) sliding and migration at extremely small grain sizes (GS). This study explores the incorporation of carbon nanotubes (CNTs) into nanocrystalline metals to enhance plastic flow stress by impeding metal deformation. The results demonstrate that CNTs increase the critical stress of pure polycrystalline metals as GS increases. The relationship between plastic flow stress and GS in the composites is modeled using Hall-Petch and inverse Hall-Petch frameworks. As GS increases, the dominant plastic strengthening mechanism transitions from GB sliding hindrance via CNTs to a combined effect that mitigates GB sliding and intragranular stacking faults. Additionally, the study evaluates how CNT length, wall number, and functionalization influence plastic strengthening. Hence, these findings provide a theoretical foundation for the design of mechanically stable nanocrystalline metal composites.</p>

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Enhancement mechanism of plastic stress in nanocrystalline metals using carbon nanotubes: Molecular simulation and characterization

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Fei Wang,
  • Li Li,
  • Xinli Jiang,
  • Xuelin Wang,
  • Yujin Hu

摘要

The instability of nanograined metals and the degradation of their mechanical properties primarily arise from pronounced grain boundary (GB) sliding and migration at extremely small grain sizes (GS). This study explores the incorporation of carbon nanotubes (CNTs) into nanocrystalline metals to enhance plastic flow stress by impeding metal deformation. The results demonstrate that CNTs increase the critical stress of pure polycrystalline metals as GS increases. The relationship between plastic flow stress and GS in the composites is modeled using Hall-Petch and inverse Hall-Petch frameworks. As GS increases, the dominant plastic strengthening mechanism transitions from GB sliding hindrance via CNTs to a combined effect that mitigates GB sliding and intragranular stacking faults. Additionally, the study evaluates how CNT length, wall number, and functionalization influence plastic strengthening. Hence, these findings provide a theoretical foundation for the design of mechanically stable nanocrystalline metal composites.