Metal treatment – Stock – Age or precipitation hardened or strengthened
Patent
1997-04-08
1999-03-09
Wyszomierski, George
Metal treatment
Stock
Age or precipitation hardened or strengthened
148439, 420535, 420539, C22C 2112
Patent
active
058794751
ABSTRACT:
There is claimed a forged structural member suitable for aerospace applications and having improved combinations of strength and toughness. The member is made from a substantially vanadium-free, lithium-free aluminum-based alloy consisting essentially of: about 4.85-5.3 wt. % copper, about 0.5-1.0 wt. % magnesium, about 0.4-0.8 wt. % manganese, about 0.2-0.8 wt. % silver, about 0.05-0.25 wt. % zirconium, up to about 0.1 wt. % silicon, and up to about 0.1 wt. % iron, the balance aluminum, incidental elements and impurities, the Cu:Mg ratio of said alloy being between about 5 and 9, and more preferably between about 6.0 and 7.5. The invention exhibits a typical longitudinal tensile yield strength of about 71 ksi or higher at room temperature and can be forged into aircraft wheels or various brake and other product forms.
REFERENCES:
patent: 5376192 (1994-12-01), Cassada, III
patent: 5630889 (1997-05-01), Karabin
patent: 5652063 (1997-07-01), Karabin
patent: 5665306 (1997-09-01), Karabin
Metals Handbook, 9th edition, vol. 14 "Forging of Aluminum Alloys" by G.W. Kuhlman, pp. 241-245, ASM, 1988.
Aluminum Company of America
Topolosky Gary P.
Wyszomierski George
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