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Phase-Field Simulation of Interdiffusion and Microstructure of Cu–Ni Diffusion Couples

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The atomic migration and microstructure evolution of interdiffusion in Cu–Ni diffusion couples were investigated using the phase-field simulation. The atoms diffusion direction is dominated by the concentration gradient in the α1(Cu-rich)/α1 + α2(Ni-rich) or α21 + α2 diffusion couples, the Ni atoms migrate from the high concentration to the low concentration regions and the interface moves to the two-phase side. The chemical potential gradient dominates the atoms diffusion direction in the α1 + α21 + α2 diffusion couple, and the Ni atoms migrate from the low concentration to the high concentration regions. The larger the concentration difference between the diffusion couples, the intenser the interdiffusion and interface movement. Thus, the atoms diffusion direction and the interface microstructure depend on the concentration difference, chemical potential gradient and the initial morphology of the couples.
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Keywords: COPPER ALLOY; INTERDIFFUSION; MICROSTRUCTURE; PHASE-FIELD MODEL

Document Type: Research Article

Publication date: September 1, 2012

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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