Preparation and Structural Characterization of Rapidly Solidified Al-Si Alloys

Abstract

: Rapidly solidified hypereutectic Al100-x-Six alloys (x = 12; 20; 40 wt.%) with cost effective minor additions (Ni, Ti, Fe and P) have been prepared and analysed. The increased cooling rate and the minor additives determine an expansion of the coupled growth area, which is displayed asymmetrically in relation to the eutectic point, thus favouring the formation of nano and amorphous structures. Fe and P additives are structure refiners leading to nano-sized Al and Si grains and the Ni and Ti additives result in a homogeneous amorphous as cast structure.