Method for producing fine-grained, high strength aluminum alloy

Details Method for producing fine-grained, high strength aluminum alloy Method for producing fine-grained, high strength aluminum alloy

1982-03-05

1984-07-31

Dean, R.

Metal treatment

Compositions

Heat treating

148 127A, 148417, 148439, C22F 104

Patent

active

044628439

ABSTRACT:
An aluminum alloy material having a high strength, small grain size, good resistance to stress corrosion cracking and very high degree of workability is produced from an aluminum base alloy consisting essentially of 5.1 to 8.1 wt. % Zn, 1.8 to 3.4 wt. % Mg, 1.2 to 2.6 wt. % Cu, up to 0.2 wt. % Ti and at least one of 0.18 to 0.35 wt. % Cr and 0.05 to 0.25 wt. % Zr, the balance being aluminum and impurities by an improved production method described in detail in the disclosure. The improved method is particularly characterized by a special annealing step in a continuous annealing furnace under the application of a tension not exceeding 2 kg/mm.sup.2 to a coiled alloy sheet to be annealed, the annealing including rapid heating of the coiled alloy sheet to a temperature of 400.degree. to 500.degree. C. at a heating rate exceeding 50.degree. C./min.

REFERENCES:
patent: 4410370 (1983-10-01), Baba et al.

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