Thermal analysis study on the simultaneous grain refinement and modification of 380.3 aluminum alloy

In this research, effect of integrated Al-10Sr-1Ti-2B master alloy has been studied on the microstructure and solidification characteristics of 380.3 aluminum alloy. Thermal Analysis has been used as a technique to study the cooling curves and first derivative curves during solidification of the alloy. Effect of integrated grain refiner and modifier on solidification parameters such as alpha-Al dendrite growth temperature (T (G,alpha)), alpha-Al dendrite recalescence undercooling (a dagger T (R,alpha)), aluminum-silicon eutectic growth temperature (T (G,E)), and eutectic recalescence undercooling (a dagger T (R,E)) has been determined. By increasing master alloy content, T (G,alpha) and a dagger T (R,E) have been increased, but, a dagger T (R,E) has been decreased, and T (G,E) increases first and then decreases. Aluminum-silicon eutectic depression temperature () can be used as a parameter to control the modification of eutectic silicon. The results of this research indicate that the optimum level of Al-10Sr-1Ti-2B master alloy for the simultaneous grain refinement and modification of 380.3 alloy is about 0.5 mass%.