Method of extruding a 6000-series aluminum alloy and an extruded

Details Method of extruding a 6000-series aluminum alloy and an extruded Method of extruding a 6000-series aluminum alloy and an extruded

1994-03-30

1996-04-02

Simmons, David A.

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148689, 148690, 148439, 420535, C22F 104

Patent

active

055036902

ABSTRACT:
In a method of extruding a 6000-series-type aluminum alloy by casting, homogenizing, extruding and optionally, aging and/or heat treating, an alloy composition is provided having silicon 0.6-1.2 wt. %, magnesium 0.7-1.2 wt. %, copper 0.3-1.1 wt. %, manganese 0.1-0.8 wt. %, zirconium 0.05-0.25 wt. %, up to 0.5 wt. % iron, up to 0.15 wt. % chromium, up to 0.25 wt. % zinc, up to 0.10 wt. % titanium with the balance aluminum and incidental impurities wherein an effective amount of zirconium, in combination with effective amounts of manganese, produces a fibrous grain structure which contributes to a combination of high strength and fracture toughness in the extruded alloy. The fibrous grain structure also permits improvements in forming the extrusion by enabling lower temperatures to be utilized during the homogenization step. In extruding this 6000-series-type aluminum alloy, a final product is produced having improved combinations of strength and fracture toughness for use in structural applications or the like.

REFERENCES:
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patent: 4511632 (1985-04-01), Toma et al.
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patent: 4718948 (1988-01-01), Komatsubara et al.
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Ohori, et al. "Proceedings of the Third International Aluminum Extrusion Technology Seminar", vol. 1, pp. 63-67; Atlanta, 1984.

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