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High-Performance AA6063 Designed to Meet 6xxx Medium-Strength Alloys Properties

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High-Performance AA6063 Designed to Meet 6xxx Medium-Strength
Alloys Properties

Jerome Fourmann, Rio Tinto Alcan, Cleveland, Ohio, USA
Ram Ramanan, Rio Tinto Alcan, Cleveland, Ohio, USA
Nick Parson, Rio Tinto Alcan, Jonquiere, Quebec, Canada


Track: BILLET PROCESS & EQUIPMENT - Alloys

ABSTRACT—The 6xxx series alloys represent over 80 percent of the North American extrusion market.
AA6005A and AA6061 have dominated the medium-strength alloy extrusion market for many
years. Ongoing energy efficient developments, particularly in the transportation and building and
construction industries, require improved engineering properties for 6xxx series medium-strength
aluminum extrusion alloys. Quite often end users select a structural alloy because of the property
gap between AA6063-T6 and AA6061-T6/AA6005A-T61. For 6xxx series alloys, the mechanical
properties are determined by MgxSi precipitates. Recent research has demonstrated that the peakaged
condition is better achieved when it has an alloy chemistry with approximately a 1:1 atomic
ratio of Mg and Si. This work has lead to bridging the property gap and introducing AA6063
Super FlowTM. Low breakthrough pressure, maximum extrudability, and low quench sensitivity
are the fundamentals of this alloy. Corrosion resistance, machinability and weldability features
are retained without compromising metallurgical characteristics and engineering properties.
Significant volumes of this alloy have been shipped to extruders and their continuing satisfaction
has served as an impetus for registering the AA6063-T65 temper. Acceptance of the Rio Tinto
Alcan High-Performance AA6063 Super Flow alloy has been successful in the market.

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