1988 年 28 巻 10 号 p. 795-801
General forms of Fourier expressions for the one- and two-dimensional non-linear dif fusion equations containing the gradient energy term are proposed and computer-simulations in some supersaturated solid solutions are derived on the basis of the Fourier expressions. The phase-decompositions proceed to form periodic zone-arrangements in the high solute alloys, while in the low solute alloys a few composition peaks sparsely distributed appear. In the calculation for the phase decomposition of an elastically anisotropic solid solution, the <100> modulated structure is formed, which explains well the morphology in actual spinodally decomposed alloys having an elastic anisotropy factor greater than unity. The computer simulations obtained based on the non-linear diffusion equations are very useful and powerful for the basic understanding of phase decomposition.
