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A model has been proposed to describe the microstructure evolution under the practical solidification conditions. Calculations have been carried out for hypermonotectic Al-Pb alloys. The microstructure development in a rapidly directionally solidified immiscible alloy has been discussed.
The microstructure evolution in an atomized hypermonotectic alloy drop is calculated. The results indicate that the formation of the minor phase shell on the surface of the powder is due to the heterogeneous nucleation of the minor phase droplets on the atomized drop surface and the resultant diffusional transfer of solute during the liquid–liquid phase transformation.
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