Producing combined high strength and high corrosion...

Details Producing combined high strength and high corrosion... Producing combined high strength and high corrosion...

C - Chemistry, Metallurgy

22

F

148/55.6

C22F 1/04 (2006.01) C22F 1/053 (2006.01)

Patent

CA 1045528

Abstract of the Disclosure 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 175 to 325°F, then subjecting the article to a time and temperature within the perimeter ABCD of Figure 4, and then again precipitation hardening at 175 to 325°F. This method yields an article resistant to stress corrosion cracking without appreciable, if any, sacrifice in strength as compared with the T6 condition.

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