Abstract
A new class of ternary Al–7Si–xMg alloys was developed with improved microstructure consisting of fine spheroidal Mg2Si and eutectic Si particles dispersed in α-Al. The studies show that Mg and Sr have a modification effect on eutectic Si and Mg2Si particles respectively. In alloys with high Mg, a combination of Sr addition followed by T6 treatment resulted in a fine and spheroidal eutectic mixture of Si and Mg2Si. It was concluded that 2wt% Mg is optimum to obtain a minimum amount of coarse Mg2Si particles in the Al–7Si–xMg system as well as modify the eutectic Si particles. Furthermore, the hardness of Al–7Si–xMg alloys with and without Sr addition is comparable with those of in-situ Al–7Si–TiB2 composites indicating that they can be used as an alternative for the composites for wear resistant applications.
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