Phase-field simulation of coarsening of γ precipitates in an ordered γ′ matrix

✍ Scribed by J. Boisse; N. Lecoq; R. Patte; H. Zapolsky

• Book ID: 103998275
• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 808 KB
• Volume: 55
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2007.07.014

✦ Synopsis

The evolution of the microstructure and coarsening kinetics of disordered c precipitates in an ordered monovariant c 0 matrix was studied using a diffuse-interface phase-field model in two dimensions. Specifically, we studied the morphological evolution, average precipitate size and size distribution as a function of time for a given temperature and for different concentrations. It was found that the coarsening kinetics for the average particle size are described by a t 1/3 power law with a rate constant that increases with the volume fraction of the c phase. The particle size distribution scaled by the average particle size is time invariant. We find that the particle shapes are perturbed by elastic interaction and local distributions of c particles. Comparison of the phase-field simulation results with experiments shows good qualitative agreements.