Aluminum Company of America

Asuri K Vasudevan

Roberto J Rioja

Edward L Colvin

Ralph R Sawtell

Alex Cho

Philip E Bretz

Stephen C Byrne

Jocelyn I Petit

Brian A Cheney

Disclosed is an aluminum base alloy suitable for forming into a wrought product having improved combinations of strength, corrosion resistance and fracture toughness. The alloy is comprised of 0.2 to 5.0 wt. % Li, 0.05 to 6.0 wt. % Mg, at least 2.45 wt. % Cu, 0.01 to 0.16 wt. % Zr, 0.05 to 12 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, the balance aluminum and incidental impurities.

Aluminum-lithium alloys

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.

Aluminum alloy two-step aging method and article

Disclosed is a metal alloy product having increased resistance to fatigue crack growth and having coarse grains distributed in a fine grain structure, the coarse grains having a different alloy composition from the fine grain structure.

Alloy having improved fatigue crack growth resistance

A nonconsumable electrode assembly suitable for use in the production of metal by electrolytic reduction of a metal compound dissolved in a molten salt, the assembly comprising a metal conductor diffusion welded to a portion of a ceramic electrode body having a level of free metal or metal alloy sufficient to effect a metal bond.

Diffusion welded nonconsumable electrode assembly and use thereof for

Aluminum conductor is made from direct chill cast (DC) ingot with improved conductivity and creep resistance by heating an aluminum-base alloy ingot containing not more than 0.40 wt. % and preferably not more than 0.30 wt. % Fe or a mixture of Mg, Ni or Zr with Fe to a temperature of 400.degree. to 600.degree. C., hot rolling the ingot in this temperature range and then further hot rolling at a reduced temperature range of 175.degree. to 325.degree. C.

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Pittsburgh, PA, United States of America

Asuri K Vasudevan