Caracterização da liga Al-5wt%Si-0,5wt%Mg para tixoconformação

Abstract

The Al-Si-Mg alloys used for processing on the semi-solid state are notably Foundry alloy A356 and A357. The 8th International Conference on Processing of alloy Semi-solid and Composite shows a 40% increase in the production of components for this type of technology in recent years, with prospects of increase of 30% by 2012. The development of new alloys specially designed for use on tixo-conformation is a new challenge in this area of research, mainly in Brazil. This work will present some results of the study of the alloyAl-5,0wt% Si- 0,5wt%Mg obtained by conventional casting followed ultra-refining namely their morphological evolution presented in reheating of material for the production of solid fraction of 45% in four different times (0s, 30s, 90s and 210s). The morphological developments showed that with increased residence time in semi-solid state, materials there was change in the type of structure, going from dendritic to globular, presenting the alloy favorable for the use as an alloy semi-solid. Also it was noted that the increase of treatment time meant an increase in the average size of the globules.