Aluminium alloys

Details Aluminium alloys Aluminium alloys

C - Chemistry, Metallurgy

22

C

75/87

C22C 21/00 (2006.01)

Patent

CA 1058424

ABSTRACT OF THE DISCLOSURE An aluminium alloy is provided which consists of 2 to 12% by weight of chromium, 0.2 to 3.0% by weight of iron, the balance being aluminium apart from minor proportions of impurities and incidental elements wherein most of the chromium is present as a metastable solution in the aluminium lattice in the form of fine particles having dimensions of 5 microns or less, and which contains a precipitate phase of iron rich zones the major proportion of which have dimensions of 200 .ANG. or less, the presence of large intermetallic particles, particularly at grain boundaries, being at a minimum. This alloy may be produced by an evaporation deposition process. Alloys according to the present invention have impact strength, fatigue properties, elevated temperature tensile strength, creep resistance and corrosion resistance superior to those of aluminium alloys used heretofore, and are suitable for aerospace applications, e.g. airframes.

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