Size distribution and solidification of Cu-rich dispersed particles in the core region of stable core shell microstructures of metastable alloy

The particle size distribution and solidification of dispersed Cu-rich particles within the core region of stable core shell microstructures in drop tube processed metastable Cu-50 at. % Co alloy was studied with a view of understanding the evolution and growth of these microstructures. Microstructural evidence indicates that the formation of the core shell microstructures is highly influenced by nucleation and growth phenomenon. Coalescence propelled by collision is favoured in smaller droplets owing to their higher cooling rates and subsequent higher degree of undercooling to facilitate the liquid phase separation process. Weaker Marangoni motion impeded the further convergence of the Cu-rich particles within the core region.