Analysis of Phase Transformation in Hipoeutectic Al-Si Alloys

Abstract

Measurement of temperature and transformation duration provides information on structure generation. Improving the structure of hypoeutectic Al-Si alloys can be achieved both by introducing small quantities of additives and by applying high cooling rates. Dilatometric studies allowed the determination of activation energy for the decomposition of supersaturated _ solid solution. Increased cooling rates cause an increase of the activation energy from a value of 152 kJ/mol for casting in refractory brick to a value of 201 kJ/mol for casting in steel mold in the case of ATSi5Cu1 alloy.