Method of producing a high strength balanced Al-Mg-Si alloy and a weldable product of that alloy

US6994760B2 · kind B2 · utility

Assignee

• Corus Aluminum Walzprodukte GmbH · DE

Inventors

• Rinze Benedictus · Delft, NL
• Christian Joachim Keidel · Montabaur, DE
• Guido Weber · Andernach, DE
• Alfred Johann Peter Haszler · Vallendar, DE

Key dates

• Filing date: Jun 2, 2003
• Grant date: Feb 7, 2006
• Expiry date: Jun 22, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/12764
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention relates to a method for producing high strength balanced Al—Mg—Si alloy with an improved fatigue crack growth resistance and a low amount of intermetallics, comprising the steps of The pre-heating is preferably performed for 6 to 18 hours with temperatures between 530° C. and 560° C. The alloy has a fatigue crack growth rate at ΔK=20 MPa√m of below 9.0E−04 and at ΔK=40 MPa√m of below 9.0E−03, wherein the amount of intermetallics within the finally worked alloy product, according to the measured specific energy Delta H associated with the DSC signal, is below 1.5 J/g.