Elevated temperature aluminum alloys

US4861551A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Peter Joel Meschter · Niskayuna, US
• Richard J. Lederich · Des Peres, US
• James E. O'Neal · Saranac, US

Key dates

• Filing date: Jul 30, 1987
• Grant date: Aug 29, 1989
• Expiry date: Jul 30, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C1/0416
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Three aluminum-lithium alloys are provided for high performance aircraft structures and engines. All three alloys contain 3 wt % copper, 2 wt % lithium, 1 wt % magnesium, and 0.2 wt % zirconium. Alloy 1 has no further alloying elements. Alloy 2 has the addition of 1 wt % iron and 1 wt % nickel. Alloy 3 has the addition of 1.6 wt % chromium to the shared alloy composition of the three alloys. The balance of the three alloys, except for incidentql impurities, is aluminum. These alloys have low densities and improved strengths at temperatures up to 260.degree. C. for long periods of time.