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- Title
Spinodal decomposition of fine-grained binary alloys: A Monte-Carlo simulation.
- Authors
Liu, J.-M.; Lim, L.; Wu, Z.; Cao, G.; Chen, G.; Liu, Z.
- Abstract
The kinetics of spinodal decomposition of binary alloys in case of finite grain size and slow grain growth is studied by applying the Monte-Carlo method where a coupled algorithm of the spin-exchange Ising model and Q-state Potts model operates. The anisotropic energy of grain boundaries is incorporated by imposing a Potts spin lattice on the Ising crystal. We simulate the phase separation where the grain size is comparable with the spinodal length on the order of magnitude. It is revealed that the grain boundaries of low excess energy as rapid channel enhance the solute diffusion, whereas those boundaries of high excess energy hinder the solute diffusion. Depending on the system supersaturation, phase aggregation preferred at the grain boundaries is demonstrated. The spinodal kinetics is modulated by the grain growth so that the Lifshitz-Slyozov-Wagner law may no longer be applicable in spite of the scaling law roughly holds in present system.
- Subjects
BINARY metallic systems; MONTE Carlo method; ANISOTROPY; ISING model; PHASE separation method (Engineering); SCALING laws (Nuclear physics)
- Publication
Journal of Materials Science, 2000, Vol 35, Issue 11, p2729
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1023/A:1004762128094