Patent ID: 7762310
Filing Date: 2010-07-27
Classification: B22D,B32B,C22C,Y10T

Abstract:
1. A method of producing a clad sheet article, which method comprises: providing a cladding of an aluminum alloy on at least one face of a core ingot made of an aluminum alloy having superplastic properties by co-casting to form a clad ingot; and rolling said clad ingot to produce a sheet article having a core layer and at least one cladding layer; wherein said aluminum alloy of said core ingot includes magnesium as an element that diffuses from an interior of the core layer to a surface thereof at temperatures required for superplastic forming of said article and that causes surface deterioration when present at an outer surface of said article, and said cladding layer is chosen to include silicon present in an amount of 0.3 wt. % or more as an element that interacts with said magnesium of the core to reduce diffusion of said magnesium of the core through said cladding layer.