日本金属学会誌

J. Japan Inst. Metals, Vol. 60, No. 6 (1996),
pp. 560-568

Computer Simulation of Phase Decomposition in Fe-Mo AlloyBased on Discrete Type Diffusion Equation

Toshiyuki Koyama1, Toru Miyazaki1, Minoru Doi1Abd El-Azeam Mohamed Mebed1 and Takeshi Moriya2

1Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya
2Department of Physics, Nagoya Institute of Technology, Nagoya

Abstract:

The two-dimensional computer simulations are performed for the phase decomposition in the Fe-Mo binary alloy system on the basis of a new method proposed by us. The thermodynamic data on the Fe-Mo phase diagram is used in the simulation. The microstructures theoretically obtained are well coincident with experimental facts of this alloy system. Furthermore, the typical features in the strain-induced microstructure changes calculated are as follows: (1) The competitive growth, which is just like a dislocation climbing mechanism, between the precipitate particles is observed in the coarsening process of the modulated structure. (2) The microstructure with the precipitate particles in same size aligned to the <{10}> direction appears in the later stage of coarsening. This phenomenon is caused by the effect of elastic interaction energy between the particles. (3) The elastically hard phase (Mo-rich phase) is covered by a elasically soft thin phase (Fe-rich phase). This microstructural morphology results from the stress field due to the elastic inhomogeneity, i. e. the effect of the inhomogeneous elastic stiffness which changes with the local composition in the microstructure.


(Received December 13, 1995)

Keywords:

computer simulation, phase decomposition, spinodal decomposition, kinetics, diffusion equation elastic interaction energy, modulated structure, iron-molybdenum alloy, coarsening, non-linear


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