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Pure Appl. Chem., 2011, Vol. 83, No. 5, pp. 1085-1092

Published online 2011-04-04

Supersaturation and solute enrichment and their role in phase transformations in metal alloys

Markus Rettenmayr

Institute of Materials Science and Technology, Friedrich-Schiller-University Jena, Dā€‘07743 Jena, Germany

Abstract: Supersaturations and depletion or enrichment of solute/solvent are known to be the driving forces for phase transformations. In the present work, a series of different experiments is presented where in a single phase or a two-phase mixture supersaturation or enrichment/depletion of solute occur in at least one of the phases. In all cases the result is a phase transformation, particularly either the precipitation of a secondary phase out of a primary phase, or the migration of the interface in a two-phase mixture. It is demonstrated that solute transport in the phase exhibiting faster kinetics controls the phase transformation process.