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High-strength aluminum alloy extruded material and method for manufacturing the same

Inactive Publication Date: 2014-04-10
SUMITOMO LIGHT METAL INDS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The present patent describes a new high-strength aluminum alloy extruded material with excellent corrosion resistance and surface quality. The material contains specific elements in specific amounts, which results in excellent extrusion productivity and surface quality. The material also exhibits a high proof stress of 350 MPa or more. The method for manufacturing the material involves specific processing temperatures, times, and procedures. Overall, the patent provides a solution for manufacturing a high-strength aluminum alloy extruded material with excellent properties.

Problems solved by technology

Therefore, it has been required to increase the plate thickness and to impart a shape for reinforcement, for example, by forging, which disadvantageously results in low productivity.
However, the aluminum alloy extruded material described in Patent Document 1 has a tensile strength of about 300 MPa, which is an insufficient strength for use in place of iron-based materials.
Specifically, when the aluminum alloy described in Patent Document 2 is extruded at a high speed, defects may occur on its surface in association with the extrusion, such as surface exfoliation, due to friction against the die, etc., which results in a reduction of the surface quality.
Also, the aluminum alloy forged material described in Patent Document 2 has a relatively high Cu content for 6000 series aluminum alloys, and thus has poor corrosion resistance.

Method used

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  • High-strength aluminum alloy extruded material and method for manufacturing the same

Examples

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example 1

[0050]This is an Example for investigating the chemical components (elemental composition) of the above-described high-strength aluminum alloy extruded material. In this Example, alloys (Alloys Nos. A to M) comprising the elements in various amounts as indicated in Table 1 were used to produce samples (Samples Nos. 1 to 13) according to the manufacturing conditions indicated in Table 2, and then strength measurements, metallographic structure observations, surface quality evaluations and corrosion resistance evaluations were carried out on the respective samples. Hereinafter, the conditions for manufacturing the respective samples and the methods for measuring their strength, observing their metallographic structure, evaluating their surface quality and evaluating their corrosion resistance will be explained in further detail.

[0051]Ingots having a diameter of 90 mm and containing the elements indicated in Table 1 were cast using a continuous casting technique. Thereafter, the ingots...

example 2

[0070]This is an Example for investigating methods for manufacturing the above-described high-strength aluminum alloy extruded material. In this Example, alloy No. A indicated in Table 1 was used to produce samples (Samples Nos. 21 to 39) according to the manufacturing conditions that varied as indicated in Table 4, and then the strength measurements, metallographic structure observations, surface quality evaluations and corrosion resistance evaluations were carried out on the respective samples. In this respect, it is noted that the details of the conditions for manufacturing the respective samples and the methods for measuring their strength, observing their metallographic structure, evaluating their surface quality and evaluating their corrosion resistance are the same as described above in Example 1.

[0071]The evaluation results for the respective samples are indicated in Table 5. It is noted that the evaluation results for the samples that were not judged as being acceptable or ...

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Abstract

A high-strength aluminum alloy extruded material contains Si: 0.70 to 1.3 mass %; Mg: 0.45 to 1.2 mass %; Cu: 0.15 to less than 0.40 mass %; Mn: 0.10 to 0.40 mass %; Cr: more than 0 to 0.06 mass %; Zr: 0.05 to 0.20 mass %; Ti: 0.005 to 0.15 mass %, Fe: 0.30 mass % or less; V: 0.01 mass % or less; the balance being Al and unavoidable impurities Crystallized products in the alloy have a particle diameter of a is 5 μm or less. Furthermore, an area ratio of a fibrous structure in a cross section parallel to an extruding direction during hot extrusion is 95% or more.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application claims priority under 35 U.S.C. §119 to Japanese Application No. 2012-222943, filed on Oct. 5, 2012, entitled “HIGH-STRENGTH ALUMINUM ALLOY EXTRUDED MATERIAL AND METHOD FOR MANUFACTURING THE SAME”. The contents of this application are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an extruded material formed of a high-strength aluminum alloy.[0004]2. Description of Related Art[0005]A 6000 series aluminum alloy material has excellent strength and corrosion resistance, and is used in applications such as mechanical components, structural members and the like. In recent years, the application of a 6000 series aluminum alloy material to frames, etc. of transportation machines such as automobiles has been considered to reduce the weight of the frames, etc.[0006]Examples of high-strength aluminum alloy materials suitably u...

Claims

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Application Information

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IPC IPC(8): C22F1/05C22F1/047C22F1/043
CPCC22F1/05C22F1/047C22F1/043
Inventor HATTA, HIDENORIWATANABE, TAKERO
Owner SUMITOMO LIGHT METAL INDS LTD
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