Patent ID: 6866085

Claim:
A method of coupling a cast aluminum alloy product with another member using plastic deformation, which comprises the steps of: preparing a molten aluminum alloy having a composition consisting of 6.5-8.0 mass % Si, 0.25-0.45 mass % Mg, 0.08-0.40 mass % Fe, 0.001-0.01 mass % Ca, P less than 0.0015 mass %, 0.02-0.1 mass % Ti, 0.001-0.01 mass % B, optionally one or two of 0.05-0.3 mass % Cr and 0.05-0.2 mass % Mn, and the balance being Al except inevitable impurities; injecting said molten alloy into a cavity of metal dies at a speed of 0.05-0.25 m/second, so as to shape a cast body to a profile having a cave or hole; cooling said injected molten alloy at a cooling speed of 200° C./second or higher in a temperature range between liquidus and solidus curves of said aluminum alloy in a state charged with a pressure of 30MPa or more; arranging another member in said cave or hole of said cast body; and coupling said another member to said cast body by plastic flow of an alloy at a part above or around said cave or hole to said cave or hole.