Modeling of dispersoid precipitation in multicomponent alloys
(English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453Article in journal (Other academic) Submitted
A model for nucleation, growth and coarsening of precipitates in multicomponent, multiphase systems is presented. High supersaturation and volume fraction of theprecipitate phase are considered. Deviation from local equilibrium at the phaseinterface is treated by means of a model based on trans-interface diffusion. Anexample simulation predict a sudden transition from diffusion-controlled to massivegrowth during continues cooling of an Fe-5%Ni alloy. The precipitation model iscompared with experiments in the Al-Sc-Mg system. To calculate the equilibriumphases, the chemical driving forces, equilibrium concentrations and diffusivities, thecommercial softwares Thermo-Calc and Dictra were used. The main advantage ofthis strategy is that there is nearly no restriction on a special alloy system.
Phase transformations, simulation, nucleation and growth, coarsening, multicomponent
IdentifiersURN: urn:nbn:se:kth:diva-31453OAI: oai:DiVA.org:kth-31453DiVA: diva2:404139
QS 201203272011-03-162011-03-162012-03-27Bibliographically approved