Abstract
A non-linear diffusion equation including the information of solute atom occupation probability at an atom site, which is named “discrete type diffusion equation,” is newly proposed. The composition dependencies of atomic interchange energy and of elasticity are also taken into account so as to be applicable for the real alloy system. The computer simulations are performed for the phase decomposition of Fe-Mo and Al-Zn binary alloy systems by utilizing the thermodynamic data on equilibrium phase diagrams. The microstructures theoretically obtained are quantitatively well coincident with experimental results of the real alloys. The availability of this method proposed is very high, because various types of ordering parameters such as the degree of order, the crystallographic tetragonality and so on can be used in the equation, instead of the composition c.
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