抄録
From the view point of reducing the weight of automobile and their energy consumption, the use of Al-Si alloy forging parts is attracting attention to the automobile industry. The microstructures affected to the mechanical properties of Al-Si alloy casting small bar in the order of elongation, ultimate-strength and yield strength. Mechanical properties and forgiability were improved remarkably when DAS became under 20μm. The cutting properties were improved except for chip treatment when microstructure was controlled fine and homogenious. In order to obtain good mechanical properties, it is necessary to control microstructures as same as chemical compositions of alloy.
