Aluminum alloy extrusions having a substantially unrecrystallized structure

US6325869A · kind A · utility

Assignee

• ALCOA INC. · US

Inventors

• John Liu · Murrysville, US
• Gary H. Bray · Murrysville, US
• David A. Lukasak · Murrysville, US
• Robert C. Pahl · Lafayette, US

Key dates

• Filing date: Jan 15, 1999
• Grant date: Dec 4, 2001
• Expiry date: Jan 15, 2019

Classification

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

Abstract

A substantially unrecrystallized extrusion comprising about 3.6 to about 4.2 wt. % copper, about 1.0 to about 1.6 wt. % magnesium, about 0.3 to about 0.8 wt. % manganese, about 0.05 to about 0.25% zirconium, the balance substantially aluminum, incidental elements and impurities. The extrusion has a longitudinal yield strength of at least about 50 ksi and a longitudinal tensile ultimate strength of at least about 70 ksi. On a preferred basis, the extrusions of this invention include very low levels of both iron and silicon, typically on the order of less than 0.1 wt. % each, and more preferably about 0.05 wt. % or less iron and about 0.03 wt. % or less silicon.