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High-strength aluminum alloy product and method of producing the same

a technology of aluminum alloy and high-strength, which is applied in the field of heat treatment high-strength al — cu — mg — si aluminum alloy products, can solve the problems of low productivity, cost increase, and limited extrusion method, so as to improve the strength of al—mg—si alloy, excellent extrudability, and the effect of improving the strength of the 2013 alloy

Inactive Publication Date: 2010-03-11
SUMITOMO LIGHT METAL INDS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]As an aluminum alloy that solves the above-mentioned problems, a 2013 (Al—Cu—Mg—Si) alloy that exhibits a strength equal to that of a 2024 (Al—Cu—Mg) alloy and exhibits excellent extrudability has been proposed. The inventors of the present invention tested and studied in order to further improve the strength of the 2013 alloy (see the summary of the 110th conference of the Japan Institute of Light Metals, Apr. 13, 2006, pp. 219 to 220). The inventors got an idea from the tests and the studies that the strength of an Al—Mg—Si alloy can be improved by adding Cu, and found that a high-strength alloy can be obtained by optimally controlling the precipitate structure of the Al—Cu—Mg—Si alloy.
[0006]The present invention was conceived based on the above findings. An object of the present invention is to provide a heat-treated high-strength Al—Cu—Mg—Si aluminum alloy product that exhibits excellent extrudability and high strength, and a method of producing the same.
[0022](13) A method of producing the aluminum alloy product according to any one of (7) to (12), the method comprising hot-extruding an aluminum alloy having a composition according to any one of (8) to (10) in a hollow shape to obtain a hollow extruded product, subjecting the hollow extruded product to a solution heat treatment and quenching, cold-working the hollow extruded product so that the cross-sectional area and the external profile of the hollow extruded product are reduced, and aging the resulting product.

Problems solved by technology

However, since the Zl—Zn—Mg—Cu alloy and the Al—Cu—Mg alloy exhibit insufficient extrudability, cost increases due to low productivity.
When extruding a hollow product using such an alloy, the extrusion method is limited to mandrel extrusion (i.e., porthole extrusion cannot be used) due to high deformation resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065]An ingot (diameter: 200 mm) of each of aluminum alloys A to M having compositions shown in Table 1 was cast using a DC casting method. The ingot was homogenized at 540° C. for six hours, and allowed to cool to room temperature.

TABLE 1AlloyCuMgSiMnCrZrVTiBFeZnAlA1.80.90.9—0.05——0.02130.2—BalanceB1.50.80.6—0.06——0.02150.3—BalanceC1.10.60.5—0.06——0.03160.2—BalanceD1.91.21.0—0.06——0.02140.20.2BalanceE2.51.31.2—0.05——0.02140.2—BalanceF2.40.70.6—0.07——0.01100.4—BalanceG1.21.31.2—0.05——0.02130.2—BalanceH1.71.00.90.120.090.030.020.03180.1—BalanceI1.70.91.00.25———0.0190.20.3BalanceJ1.81.10.9—0.22——0.02100.1—BalanceK1.81.01.0——0.08—0.03170.10.1BalanceL1.71.00.7———0.090.0180.2—BalanceM1.81.00.8—0.05——0.12380.1—BalanceUnit: mass % (excluding B (ppm))

[0066]Each ingot was heated to 500° C. using an induction furnace, and hot-extruded in the shape of a tabular sheet having a width of 150 mm and a thickness of 5 mm (extrusion ratio: 42, billet diameter / minimum thickness ratio (D / T): 40). The ...

example 2

[0068]The ingot (diameter: 200 mm) of the alloy A shown in Table 1 that was cast in Example 1 was homogenized at 540° C. for six hours, and allowed to cool to room temperature. The homogenized ingot was heated to 500° C. using an induction furnace, and hot-extruded into a cross-sectional shape shown in Table 3 to obtain extruded products 14 to 20. The extrusion speed (outlet-side product speed) was set at 5 m / min.

[0069]Each extruded product was subjected to a solution heat treatment at 540° C. for one hour, and quenched using tap water at room temperature. Each extruded product was then subjected to artificial aging at 190° C. for eight hours to obtain specimens 14 to 20. The average aspect ratio of the grains of each specimen and the orientation density of the grains for which the normal to the {001} plane was parallel to the extrusion direction were measured under the same conditions as in Example 1. The microstructure observation position for calculating the average aspect ratio ...

example 3

[0081]Each of alloys (a to m) having compositions shown in Table 9 were melted according to a conventional method to obtain a billet having a diameter of 155 mm. Each billet was homogenized at 540° C. for 10 hours, and subjected to porthole extrusion at a billet temperature of 500° C. and an extrusion speed of 6 m / min to obtain an extruded pipe material having an outer diameter of 15.0 mm and a thickness of 3.0 mm.

[0082]The extruded pipe material was subjected to a solution heat treatment at 540° C. for two hours, quenched into water at room temperature drawn to an outer diameter of 13.0 mm and a thickness of 2.5 mm, and aged at 170° C. for seven hours.

[0083]The precipitates in the grains distribution condition and the average aspect ratio of the grains of the drawn product were measured, and the tensile properties of the drawn product was evaluated according to the following methods. The results are shown in Table 10.

Precipitates in the grains dispersion state: Thin film sample for...

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Abstract

A heat-treated high-strength Al—Cu—Mg—Si aluminum alloy product exhibits excellent extrudability and high strength. The high-strength Al—Cu—Mg—Si aluminum alloy product obtained by extrusion is characterized in that the microstructure of the entire surface of the cross section of the aluminum alloy product is formed of recrystallized grains, the grains have an average aspect ratio (L / t) of 5.0 or less (wherein L is the average size of the grains in the extrusion direction, and t is the average thickness of the grains), and the orientation density of the grains in the microstructure, for which the normal direction to the {001} plane is parallel to the extrusion direction in comparison with the grains orientated to random orientations, is 50 or less. The high-strength Al—Cu—Mg—Si aluminum alloy product obtained by extrusion and cold working is characterized in that rod-shaped precipitates are arranged in the grains of the matrix in the <100> direction, the precipitates have an average length of 10 to 70 nm and a maximum length of 120 nm or less, and the number density of the precipitates in the [001] direction measured from the (001) plane is 500 or more per square micrometer.

Description

TECHNICAL FIELD[0001]The present invention relates to a heat-treated high-strength Al—Cu—Mg—Si aluminum alloy product and a method of producing the same.BACKGROUND ART[0002]In recent years, it has become important to reduce the fuel consumption of a transport machine by reducing the weight from the viewpoint of global environmental protection. Therefore, an aluminum alloy extruded product has been widely used as a transport structural material due to a high specific strength, a high degree of freedom of the cross-sectional shape, and the like, and a demand for such an aluminum alloy extruded product has increased. In particular, a high-strength aluminum alloy extruded product formed of a heat-treated 7000 series (Zl—Zn—Mg—Cu) aluminum alloy, 2000 series (Al—Cu—Mg) aluminum alloy, or the like has been utilized.[0003]However, since the Zl—Zn—Mg—Cu alloy and the Al—Cu—Mg alloy exhibit insufficient extrudability, cost increases due to low productivity. When extruding a hollow product us...

Claims

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Application Information

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IPC IPC(8): C22F1/04C22F1/057C22C21/16C22C21/18C22C21/14
CPCC22C21/12C22F1/00C22F1/057C22F1/047C22C21/16C22C21/18C22C21/14
Inventor IWAMURA, SHINGOMINODA, TADASHIKATO, KATSUYA
Owner SUMITOMO LIGHT METAL INDS LTD
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