2XXX series aluminum alloy

US6113850A · kind A · utility

Assignee

• Aluminum Company of America · US

Inventors

• Charles W. Bartges · Delmont, US
• Gerald D. Scott · Massena, US
• Thomas J. Klemp · Massena, US
• M. Elise Hyland · Oakmont, US
• James A. Brock · Boise, US
• Colleen Spillard · Norwood, US

Key dates

• Filing date: Aug 9, 1994
• Grant date: Sep 5, 2000
• Expiry date: Aug 9, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22F1/057
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An A-rated, aluminum alloy suitable for machining, said alloy consisting essentially of: about 4-5.75 wt. % copper, about 0.2-0.9 wt. % bismuth, about 0.12-1.0 wt. % tin, the ratio of bismuth to tin ranging from about 0.8:1 to 5:1, up to about 0.7 wt. % iron, up to about 0.4 wt. % silicon, up to about 0.3 wt. % zinc, the balance aluminum, incidental elements and impurities. On a preferred basis, this alloy contains about 4.4-5.0 wt. % copper, about 0.4-0.75 wt. % bismuth, about 0.2-0.5 wt. % tin, the ratio of bismuth to tin ranging from about 1:1 to 3:1, about 0.2 wt. % or less iron and about 0.2 wt. % or less silicon. The alloy is substantially lead-free, cadmium-free and thallium-free. There is further disclosed an improved method for making screw machine stock or wire, rod and bar product from this alloy by casting, preheating, extruding, solution heat treating, cold finishing and aging the same.