C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/19, 148/30
C22C 21/00 (2006.01) C22C 1/02 (2006.01) C22F 1/04 (2006.01) C30B 21/02 (2006.01)
Patent
CA 1038204
ABSTRACT OF THE DISCLOSURE Dispersioin strengthened aluminium alloy products are produced by working a cast aluminium alloy having a content of unaligned intermetallic rods in a selected size range to break up the brittle intermetallic rods. The intermetallic rods form 5.0 - 20 per cent by volume of the alloy and have an average diameter in the range of 0.1 - 1.5 (preferably 0.1 - 0.8) microns. The working required to effect the necessary segmentation of the rods and dispersion of the resultant intermetallic particles is sufficient to reduce the alloy by at least 60%. Initial hot working is preferably followed by cold working to effect at least a further 10% reduction of the hod worked alloy. The preferred alloys are alloys of AL-Fe-Mn and A-Fe-Ni having a composition close to the eutectic and are cast under conditions to avoid as far as possible the formation of coarse primary intermetallic particles. The dispersion strengthened alloy products have good strength and formability in sheet form for the production of pressings.
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