C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
148/55.6
C22F 1/04 (2006.01) C22F 1/047 (2006.01) C22F 1/053 (2006.01) C22F 1/057 (2006.01)
Patent
CA 1319590
Abstract of the Disclosure A method for thermally treating an article made from an aluminum alloy having a first temperature at which solute atoms cluster to yield nuclei for the formation and growth of strengthening precipitates, and a second higher temperature at which the strengthening precipitates dissolve. The method comprises: heating the article to allow substantially all soluble alloy components to enter into solution; rapidly cooling the article in a quenching medium; and precipitation hardening the article by aging at or below the first temperature for a few hours to several months; then aging above the first temperature and below the second temperature until desired strength is achieved. A method for imparting improved combinations of strength and fracture toughness to a solution heat treated article which includes an aluminum-lithium alloy is also disclosed. This method comprises aging the article at one or more temperatures at or below a first temperature of about 93°C (200°F) for a few hours to several months; and further aging the article at one or more temperatures above the first temperature and below a second temperature of about 219°C (425°F) for at least about 30 minutes.
592130
Cheney Brian A.
Colvin Edward L.
Rioja Roberto J.
Vasudevan Asuri K.
Aluminum Company Of America
Smart & Biggar
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