Study on effects of T6 heat treatment on grain refined A319 alloy with Magnesium and Strontium addition

Effect of heat treatment on A319 alloy with 0.45%wt Magnesium, 0.02%wt Strontium and grain refinement using Titanium has been investigated by hardness measurement and tensile testing. Experiments have been conducted at ageing temperatures 150°C, 160°C and 170°C. Hardness has been estimated up to 24 hours aged samples. The results indicate that hardness of 319 alloy increases with Sr addition and grain refinement. When Mg is added hardness is again found to be increasing progressively up to a maximum value and then varying non – uniformly. The tensile strength and microstructure after Mg modification and heat treatment have been discussed.