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Tensile Failure Of Single-Crystal And Nanocrystalline Lennard-Jones Solids Under Uniaxial Strain

Author

Listed:
  • SHENG-NIAN LUO

    (Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA)

  • LIANQING ZHENG

    (Department of Chemistry, University of Missouri, Columbia, MO 65211, USA)

  • QI AN

    (School of Earth & Space Sciences, University of Science & Technology of China, Hefei, Anhui 230026, P. R. China)

  • SHIJIN ZHAO

    (Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA)

Abstract

We investigate using molecular dynamics, the tensile failure of single-crystal and nanocrystalline Lennard-Jones solids under uniaxial strain. Stresses are relaxed by plasticity and tensile failure, which are induced via stacking faults, twin planes, void nucleation and growth, and their interactions. Stacking faults and twin planes as well as multiple nanovoids are nucleated at grain boundaries in a nanocrystalline solid. Void formation is characterized by under-coordinated atoms with coordination number≤ 7, and the critical void size is comparable to a vacancy. For a single crystal, the number of stacking faults and twin planes decreases during failure mostly due to the absorption by nanovoids. In contrast, it increases with strain monotonically for a nanocrystalline solid, where abundant grain boundaries help the nucleation and deter the propagation and absorption of the stacking faults and twin planes, inducing effective dislocation pile-ups at grain boundaries even in the presence of nanovoids.

Suggested Citation

  • Sheng-Nian Luo & Lianqing Zheng & Qi An & Shijin Zhao, 2006. "Tensile Failure Of Single-Crystal And Nanocrystalline Lennard-Jones Solids Under Uniaxial Strain," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 17(11), pages 1551-1561.
    • Handle: RePEc:wsi:ijmpcx:v:17:y:2006:i:11:n:s0129183106010017
    DOI: 10.1142/S0129183106010017
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