Aluminium alloy plate and method for its manufacture

US5772800A · kind A · utility

Assignee

• Hoogovens Aluminium Walzprodukte GmbH · DE

Inventors

• Alfred Ludwig Heinz · Niederahr, DE
• Werner Schelb · Remchingen, DE
• Alfred Johann Peter Haszler · Vallendar, DE
• Otmar Martin Müller · Koblenz, DE

Key dates

• Filing date: Jun 6, 1995
• Grant date: Jun 30, 1998
• Expiry date: Jun 6, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22F1/053
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An aluminium alloy plate is provided with a thickness of more than 2 inches, e.g. 6, 7 or 8 inches, and having an average logarithmic fatigue life of more than 100,000 cycles determined in accordance with ASTM test method E 466. The density of micropores with a size larger than 80 .mu.m in all locations in the midplane (T/2) midwidth position at head and tail ends of the finished plate as measured by Optical Microscopy of samples in any plane perpendicular to the midplane is less than 0.025 micropores per cm.sup.2. The plate may be formed by degassing of a melt to give a specified porosity of the cast ingot, and by hot rolling with at least one specified high reduction ratio pass.