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Optical microscope and scanning electron microscope were used to observe the microstructure of the AI-11.6%Si and AI-11.6%Si-0.4%Mg alloys and the morphology of the massive silicon particles. It is found that the massive silicon phase, observed in the unfully modified alloys with 0.010%Sr, disappears completely in the alloys fully modified with 0.020%Sr. The serrations and reentrant edges shown in the massive silicon particles with the conventional casting indicate that the TPRE mechanism plays an important role in the growth of the massive silicon phase. The ripples and steps suggest that the “lateral microscopic growth” may be another operating mechanism.
Optical microscope and scanning electron microscope were used to observe the microstructure of the AI-11.6% Si and AI-11.6% Si-0.4% Mg alloys and the morphology of the massive silicon particles. It is found that the massive silicon phase, observed in the unfully modified alloys with 0.010% Sr, disappears completely in the alloys fully modified with 0.020% Sr. The serrations and reentrant edges shown in the massive silicon particles with the conventional casting sense that the the TPRE mechanism plays an important role in the growth of the massive silicon phase. The ripples and steps suggest that the “lateral microscopic growth ” may be another operating mechanism.