Abstract
The aim of this study is to investigate aging behavior of A356 alloy for turbo charger part. The specimen was fabricated by investment casting. Solution heat treatment was performed at <TEX>$525^{\circ}C$</TEX> for 8h and followed by aging treated at <TEX>$160^{\circ}C$</TEX>, <TEX>$170^{\circ}C$</TEX> for 0.5~20h. And their microstructures and mechanical properties of the aged specimens were analyzed by scanning electron microscope and hardness tester, respectively. All the cast A356 alloy included eutectic Si particles. In the cast A356 alloy, eutectic Si phase mainly was formed along Chinese script phase. Vickers hardness of the cast was improved by aging treatment due to formation of <TEX>${\beta}$</TEX>" phase and <TEX>${\beta}$</TEX>' phase.
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