Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1992-08-13
1994-05-17
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148698, 148701, 148417, 148439, 420532, C22F 104
Patent
active
053124987
ABSTRACT:
A method of producing an aluminum-based alloy product having improved exfoliation resistance and fracture toughness which comprises providing an aluminum-based alloy composition consisting essentially of about 5.5-10.0% by weight of zinc, about 1.75-2.6% by weight of magnesium, about 1.8-2.75% by weight of copper with the balance aluminum and other elements. The aluminum-based alloy is worked, heat treated, quenched and aged to produce a product having improved corrosion resistance and mechanical properties. The amounts of zinc, magnesium and copper are stoichiometrically balanced such that after precipitation is essentially complete as a result of the aging process, no excess elements are present. The method of producing the aluminum-based alloy product utilizes either a one- or two-step aging process in conjunction with the stoichiometrically balancing of copper, magnesium and zinc.
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patent: 3881966 (1975-05-01), Staley et al.
patent: 4305763 (1981-12-01), Quist et al.
patent: 4828631 (1989-05-01), Ponchel et al.
patent: 4954188 (1990-09-01), Ponchel et al.
Biddison Alan M.
Dean R.
Koehler Robert R.
Reynolds Metals Company
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