High-strength aluminum alloy extruded shape exhibiting excellent corrosion resistance, ductility, and hardenability, and method for producing the same

US20140166165A1Inactive Publication Date: 2014-06-19AISIN KEIKINZOKU CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
Publication Date
2014-06-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

An Al—Mg—Si-based high-strength aluminum alloy extruded shape exhibits excellent corrosion resistance and ductility, and exhibits excellent hardenability during extrusion (i.e., ensures high productivity). A method for producing the same is also disclosed. The high-strength aluminum alloy extruded shape includes 0.65 to 0.90 mass % of Mg, 0.60 to 0.90 mass % of Si, 0.20 to 0.40 mass % of Cu, 0.20 to 0.40 mass % of Fe, 0.10 to 0.20 mass % of Mn, and 0.005 to 0.1 mass % of Ti, with the balance being Al and unavoidable impurities, the aluminum alloy extruded shape having a stoichiometric Mg2Si content of 1.0 to 1.3 mass %, an excess Si content relative to stoichiometric Mg2Si of 0.10 to 0.30 mass %, and a total content of Fe and Mn of 0.35 mass % or more.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a U.S. National Stage Application of International Application No. PCT / JP2013 / 052002 filed on Jan. 30, 2013, and published in Japanese as WO 2013 / 115227 A1 on Aug. 8, 2013. This application claims priority to Japanese Application No. 2012-018486 filed on Ja. 31, 2012. The disclosures of the above applications are incorporated herein by reference.TECHNICAL FIELD

[0002] The present invention relates to an extruded shape produced using an Al—Mg—Si-based aluminum alloy.BACKGROUND ART

[0003] In recent years, a reduction in weight of automobiles aimed to improve driving performance and reduce fuel consumption has been desired from the viewpoint of environment protection.

[0004] Use of an aluminum alloy extruded shape as an automotive structural material has been studied in order to meet the requirements for reducing fuel consumption by way of a reduction in weight.

[0005] An automotive structural material is required to exhibit high...

Examples

Embodiment Construction

[0048]Billets that differ in chemical composition were cast, extruded, and evaluated as described below.

[0049]A molten metal including the alloy components shown in FIG. 1 was is prepared, and cast at a casting speed 60 mm / min or more to obtain a cylindrical billet having a diameter of 8 inches.

[0050]FIG. 2 shows the subsequent production conditions.

[0051]The cast billet was homogenized at 565 to 595° C. for 2 to 6 hours (see “HOMO conditions”).

[0052]The billet was preheated to 480 to 520° C., and extruded to obtain an extruded shape having a hollow cross-sectional shape (single-hollow cross-sectional shape) (W=50 mm, H=40 mm, t (thickness)=3 mm).

[0053]FIG. 2 shows the extrusion speed and the cooling rate.

[0054]The cooling rate was set to 50 to 100° C. / min in order to achieve press quenching by air-cooling using a fan. Note that the cooling rate was set to 200° C. / min in Comparative Example 5.

[0055]The extruded shape was cooled to room temperature, and subjected to artificial aging ...