MICROSTRUCTURE EVOLUTION DURING PERITECTIC L + Al6Mn(Fe) → α-Al + α-AlMnFeSi PROCESS IN AlFeMnSi ALLOYS

In this work, the course of peritectic L + Al6Mn(Fe) → α-Al + α-AlMnFeSi transformation taking place in AlFeMnSi alloys was traced. The specific microstructural effects in the transformed primary phase areas were revealed and identified. The transformation product situated inside the primary preperitectic Al6FeMn phase precipitates was identified as a lamellar mixture of the α-AlFeMnSi and α-Al phases, balanced volumetrically. The evolution of morphology in a peritectic α-AlMnFeSi phase observed in the examined specimens was related to the necessary exchange of components at interfaces, which are the site for nucleation and growth of transformation products. Both direction and range of the diffusion fluxes of individual components were identified. The distribution of transition metals between intermetallic phases during the progressing transformation was estimated and found to be related to both partition coefficient of components and alloy composition.

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