Method of producing improved metal alloy products

Details Method of producing improved metal alloy products Method of producing improved metal alloy products

C - Chemistry, Metallurgy

22

C

148/10, 75/79

C22C 21/00 (2006.01) C22C 1/02 (2006.01) C22F 1/04 (2006.01) C30B 21/02 (2006.01)

Patent

CA 1043671

A B S T R A C T A dispersion strengthened aluminium alloy sheet is produced by casting an Al-Fe 1.1 - 2.5% alloy, optionally containing Si up to 2.0% and, optionally, proportions of other specified alloying constituents. The alloy is cast in the form of a slab at a growth rate in excess of 25 cms/min. and a thickness of less than 25 mms so that the intermetallics are formed in the slab in the form of fine rods of a diameter of 0.05 - 0.5 microns. These rods are then segmented by reducing the slab by at least 60% by cold-rolling to develop a dispersion of fine intermetallic particles. By final annealing the rolled sheet at a temperature in the range of 250 - 400°C a sheet having a good combination of yield strength and formability is obtained (as indicated by a yield strength of greater than 15 ksi and tensile elongation greater than 15%).

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