Solidification process of Al-Mg-Si alloys

The solidification process of Al Mg Si alloys was studied. The composition and cooling rate were changed and their influences on as cast microstuctures were studied. The solidification paths of Al Mg Si alloys were determined by the analysis of microstructure. The solute distribution during nonequilibrium solidification process was measured by EPMA . It was found that the composition of FeSiAl 4～5 phase was FeSiAl 5 at high cooling rate and FeSiAl 4 at low cooling rate. No solute zone (NSZ) was found in the matrix in the vicinity of boundary, the mechanism of the formation of NSZ was analyzed with the theories of solid diffusion and solute redistribution. [