抄録
Behavior of two-step aging in an as-cast to artificial aging process of Al–10%Si–0.3%Mg system alloy cast by permanent mold was investigated by TEM and micro-vickers hardness measurement. The final aging curves are similar after pre-aging at 348 K, 373 K and 423 K for a short time without significantly increasing hardness. On the other hands, the final aging has a positive effect on the hardness after pre-aging at 348 K, 373 K and 423 K for a relatively long time with significantly increasing hardness in the under-aging region. In the final-aged specimens have very ununiformity precipitation structure, the increasing hardness is caused by the not only rod-like precipitates but also granular precipitates.
