The Role of Misfit Dislocations in Strength Enhancement of Cu/Ni Microlaminates
来源期刊：材料保护2004年增刊第2期
论文作者：Yan Zhi-jun YAN Li CHENG Dong
关键词：molecular dynamics simulation; nanoindentation; misfit dislocation; microlaminates;
摘 要：This paper simulated the nanoindentations of Cu/Ni thin films with 2D Molecular Dynamics Simulations (MDS) and examined the effects of the misfit dislocations on the mechanical properties of the microlaminates. The misfit dislocation network plays an important role in strength enhancement of Cu/Ni microlaminates because of its resistance to glide dislocations. But the strengthening also relies on the wavelength, which is defined as the thickness of adjacent two layers in microlaminates. When the wavelength is less than the critical value λc, the stress concentration caused by the movement of misfit dislocations will make Cu/Ni microlaminates weaken. Also, the critical wavelength should be more than the depth at which the dislocation nucleates in the homogeneous layer.
Yan Zhi-jun1，YAN Li2，CHENG Dong1
(1.Marine Engineering College, DaLian Maritime University;
2.Institute of Material and Technology, Dalian Maritime University, Dalian)
摘要:This paper simulated the nanoindentations of Cu/Ni thin films with 2D Molecular Dynamics Simulations (MDS) and examined the effects of the misfit dislocations on the mechanical properties of the microlaminates. The misfit dislocation network plays an important role in strength enhancement of Cu/Ni microlaminates because of its resistance to glide dislocations. But the strengthening also relies on the wavelength, which is defined as the thickness of adjacent two layers in microlaminates. When the wavelength is less than the critical value λc, the stress concentration caused by the movement of misfit dislocations will make Cu/Ni microlaminates weaken. Also, the critical wavelength should be more than the depth at which the dislocation nucleates in the homogeneous layer.
关键词:molecular dynamics simulation; nanoindentation; misfit dislocation; microlaminates;
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