Effects of P on microstructure of in-situ Mg2Si/Al composites were described

and the composites with spherical semi-solid structure where both the matrix and reinforcement are spheroidized can be successfully prepared by the isothermal heat treatment

meanwhile

the spheroidization mechanism is approached. The results show that with P modification

Mg2Si particle in the as-cast microstructure of the composites is evolved from coarse dendrite into fine block structure. Furthermore

reinforcement with fine size and uniformly distribution exhibits regular spherical structure in the isothermal heat treated semi-solid composites

while morphology of α-Al in the composites also becomes spherical structure. In addition

with increasing in holding time

the hardly any change of Mg2Si size is found

however

the noted size change of α-Al phase can be observed.