Defect Interactions between Screw Dislocations and Coherent Twin Boundaries in Several fcc Materials

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  • Li Li
    Department of Mechanical Engineering, Osaka University
  • Liu Lijun
    Department of Mechanical Engineering, Osaka University
  • Shibutani Yoji
    Department of Mechanical Engineering, Osaka University Nanotechnology Program, VNU Vietnam Japan University

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<p>The atomistic interactions between screw dislocations and coherent twin boundaries were investigated in face-centered metals of Al, Cu, Ni, Au, Ag, and Pd using molecular dynamics and nudged elastic band method. The interaction mechanism was affected by stable and unstable stacking fault energies predicted by various potentials. In Al, Cu, and Pd, screw dislocation would be absorbed by the twin boundary. However, transmissions were observed in Ni, Au, Ag, and Pd with another potential. It was found that both the critical interaction stress and energy barrier decreased as the reciprocal of the difference between unstable and stable stacking fault energies increased. Activation volumes and strain rate sensitivities were estimated around 14 b3 to 27 b3, where b is the Burgers vector, and 0.011 to 0.023, respectively. The results for Cu and Ni were further compared with experiments and showed good agreements.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 63 (6), 829-834, 2022-06-01

    公益社団法人 日本金属学会

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