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Instrumented Charpy impact tests were carried out on aluminum alloy castings solidified for various solidification times and T6 heat treated. The impact value is improved by T6 treatment in the castings solidified in a short time, but remains unchanged or lowers in those solidified in a prolonged solidification time 700 to 800s. The reason is that age-hardening proceeds notwithstanding a negligible change in eutectic Si shape. The impact value decreases with prolonging solidification time. Castings solidified for 700 to 800s have the impact value less than a half of those solidified for 20s. This is attributed to coarsening of eutectic compounds and an increase in microporosity.

Effects of T6 heat treatment on the impact strength of AC4C and AC2B aluminum alloy castings solidified for a long times.