Effect of Solution Heat Treatment Temperature on Mechanical Property and Silicon Morphology of Cast A319 Alloy

The effect of different solution heat treatment temperature on the mechanical property and silicon morphology was investigated by hardness test and microstructural analysis. The samples of A319 alloy were solution heat treated at three different temperatures (495°C, 510°C and 525°C) followed by artificial ageing at 180°C. The ageing kinetic was accelerated and peak aged gave the lowest value for the samples solution treated at the highest solution treatment temperature (525°C). This result was due to the fragmentation and spherodization of the silicon particles morphologies in the microstructure of the samples.