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Analytical treatment of diffusion during precipitate growth in multicomponent systems

✍ Scribed by Qing Chen; Johan Jeppsson; John Ågren

Book ID
103998412
Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
506 KB
Volume
56
Category
Article
ISSN
1359-6454

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✦ Synopsis

We propose an approximate growth rate equation that takes into account both cross-diffusion and high supersaturations for modeling precipitation in multicomponent systems. We then apply it to an Fe-alloy in which interstitial C atoms diffuse much faster than substitutional solutes, and predict a spontaneous transition from slow growth under ortho-equilibrium to fast growth under the non-partitioning local equilibrium condition. The transition is caused by the decrease in the Gibbs-Thomson effect as the growing particle becomes larger. The results agree with DICTRA simulations where full diffusion fields are calculated.

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