Producing combined high strength and high corrosion resistance i

Details Producing combined high strength and high corrosion resistance i Producing combined high strength and high corrosion resistance i

1987-08-06

1989-05-23

Dean, R.

Metal treatment

Compositions

Heat treating

148159, 148417, C22F 104

Patent

active

048327581

ABSTRACT:
The method of thermally treating an article composed of an alloy consisting essentially of aluminum, 4 to 8% zinc, 1.5 to 3.5% magnesium, 1 to 2.5% copper, and at least one element selected from the group consisting of 0.05 to 0.3% chromium, 0.1 to 0.5 manganese, and 0.05 to 0.3% zirconium, which method includes the steps of solution heat treating the article, then precipitation hardening the article at 173.degree. to 325.degree. F., then subjecting the article to a time and temperature within the perimeter ABCD of FIG. 4, and then again precipitation hardening at 175.degree. to 325.degree. F.

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