Quaternary Diffusion in 7000 Aluminum Alloys

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  • Takahashi Tomoshi
    Department of Materials Science and Engineering, Niihama National College of Technology
  • Minamino Yoritoshi
    Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University
  • Yamane Toshimi
    Department of Mechanical Engineering, Hiroshima Institute of Technology

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Quaternary and ternary interdiffusion experiments of 7000 aluminum alloys have been performed at 725 and 755 K. The concentration profiles indicate that the diffusion distance of Cu is shorter than those of Zn and Mg in the solid solutions. The direct interdiffusion coefficients \\ ildeDZnZnAl, \\ ildeDMgMgAl are positive, and indirect coefficients \\ ildeDZnMgAl, \\ ildeDMgZnAl are negative in the ternary Al–Zn–Mg alloys. The effective interdiffusion coefficients in 7000 aluminum alloys are in the order \\ ildeDZn,Ceff>\\ ildeDMg,Ceff>\\ ildeDCu,Ceff. When the concentration distribution of Zn and Mg are almost constant and the concentration of Cu approaches zero in the Al–Zn–Mg/Al–Zn–Mg–Cu couple, it is obvious that \\ ildeDCu,Ceff=\\ ildeDCuCu4=\\ ildeDCu(Al–Zn–Mg)∗. The ratio values of indirect to direct diffusion coefficients suggest that attractive interactions of Zn–Mg and Cu–Mg exist in the Al–Zn–Mg–Cu alloys.

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