Abstract
The influence on the aluminium matrix of chemical modification by addition of strontium or sodium has been investigated in 356 aluminium alloy cast in a permanent mould. Solution heat treatment time and artificial aging time were the two variables examined for the heat treatment study. In the as cast condition, modification does not have an influence on the overall hardness (i.e. that of the aluminium matrix and eutectic silicon) or on the microhardness of the aluminium matrix. Modification does however have an effect on the aluminium matrix of the heat treated alloy. The hardness and yield strength of the modified alloys are lower after the T6 temper compared with the unmodified alloy. Hardness–yield strength relationships have been established.MST/1953
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