The microstructures obtained during the semisolid metal processing make up of spheres

rosette like crystals but not the very fine dendritic microstructure. Due to the complex of the study

the fundamental understanding of the particle formation is very poor. On the condition of the transparent model alloy experiments

the analyses show that the globular crystals form from the direct nucleation from the liquid phase

instead of from passivation or fragments of broken dendrites.