The dissolution of a stoichiometric second phase in ternary alloys: a numerical analysis

A general numerical model is described for the dissolution kinetics of stoichiometric second phases for one-dimensional cases in ternary systems. The model is applicable to both infinite and finite media and handles both complete and incomplete dissolution. It is shown that the dissolution kinetics of stoichiometric multicomponent second phase particles can differ strongly from that of the mono-element particles. The influence of the soft-impingement, ratio of the diffusion coefficients, stoichiometry, composition and the geometry of the dissolving stoichiometric phase is shown. The model is applied to an AlMgSi-alloy.