抄録
Aluminum squeeze castings have been used as automobile or other machine parts. Because their defects were lower than the conventional die castings. Effect of hydrogen and inclusions in cast AC4CH alloy on the reliability of mechanical properties were investigated. After controlling the hydrogen content or the inclusion size, the molten alloy was cast into a cavity with 90 MPa. The hydrogen content increased by the addition of potetos into the molten alloy. The inclusion size was controlled by a stainless steel mesh, which was set at the gate in the cavity. In the as-cast material, the fracture elongation increased with the addition of hydrogen. Because the bubbles, which broke out when potatos added into the molten alloy, removed the inclusions from the molten alloy. The fracture elongation increased with a decrease in the inclusion size. But the reliability of fracture elongation, the shape parameter 'm' of Weibull distribusion, was hardly affected by the inclusion size.
