抄録
Quaternary interdiffusion experiments of Al-rich α Al-Zn-Mg-Cu alloys have been performed in the temperature range from 755 to 833 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 \ ildeDZnZn4, \ ildeDMgMg4 and \ ildeDCuCu4 are positive, and indirect coefficients are negative. The impurity diffusion coefficients of Zn (or Cu) in Al-Cu(or Zn)-Mg alloys can be expressed by the follwing equations.
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oindentFrom the ratio values of indirect coefficient to direct one, it is expected that attractive interactions of Zn-Mg, Zn-Cu and Cu-Mg atoms exist in the Al-Zn-Mg-Cu alloys.
