Metal treatment – Compositions – Heat treating
Patent
1987-12-14
1989-08-29
Dean, R.
Metal treatment
Compositions
Heat treating
148127, 148159, 148415, 148416, 148417, 420902, C22F 104
Patent
active
048613916
ABSTRACT:
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.degree. C. (200.degree. 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.degree. C. (425.degree. F.) for at least about 30 minutes.
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Cheney Brian A.
Colvin Edward L.
Rioja Roberto J.
Vasudevan Asuri K.
Aluminum Company of America
Dean R.
Topolosky Gary P.
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