High-strength aluminum alloy thin extruded shape and method for producing the same

a technology of aluminum alloy and extrusion, which is applied in the direction of heat treatment process control, manufacturing tools, heat treatment equipment, etc., can solve the problems of increasing production costs, complex industrial production processes, and difficult to obtain high-strength extrusion shapes

Inactive Publication Date: 2015-03-05
FURUKAWA SKY ALUMINUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an aluminum alloy that can be shaped into a thin extruded shape with a high yield strength and elongation. This is achieved by dispersing fine precipitates in the crystal grain, which makes the structure strong and durable. Even when producing thin extruded shapes with a thickness of 5 mm or less, the brass orientation tends to be predominant in the extrusion direction. The three-step aging treatment is used to achieve this high-strength aluminum alloy.

Problems solved by technology

However, the industrial production process becomes complex, and the production cost increases when using a rapidly solidified powder.
However, it has been difficult to obtain a high-strength thin extruded shape having a yield strength of 700 MPa or more.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2

[0033]An aluminum alloy having the composition shown in Table 3 was melted, and cast using a semi-continuous casting method to obtain an extrusion billet having a diameter of 90 mm. The billet was homogenized at 470° C. for 10 hours, cooled from 470° C. to 250° C. in 48 minutes (average cooling rate: 250° C. / h), and cooled to room temperature. The billet was heated to 420° C. in 5 minutes in an induction furnace, held for 1 minute, and hot-extruded to produce a sheet-like extruded shape having a thickness of 4 mm and a width of 60 mm. The exit-side extrusion speed during extrusion was set to 1 m / min.

[0034]The extruded shape was heated to 470° C. at a temperature increase rate of 50° C. / h, held at 470° C. for 60 minutes, quenched in water at 20 to 30° C., and subjected to the first-stage aging treatment, the second-stage aging treatment, and the third-stage aging treatment under the conditions (a1 to a13) shown in Table 4 to obtain a specimen (Specimens 17 to 29). In the first-stage ...

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Abstract

An Al—Zn—Mg—Cu-based high-strength aluminum alloy thin extruded shape has a yield strength of 700 MPa or more. The high-strength aluminum alloy thin extruded shape includes 9.0 to 13.0 mass % of Zn, 2.0 to 3.0 mass % of Mg, 1.0 to 2.0 mass % of Cu, and 0.05 to 0.3 mass % of Zr, with the balance being Al and unavoidable impurities, fine precipitates having a circle equivalent diameter of 5 to 20 nm being dispersed in a crystal grain of the extruded shape in a number of 4000 to 6000 per μm2.

Description

TECHNICAL FIELD[0001]The invention relates to a high-strength aluminum alloy thin extruded shape and a method for producing the same. More specifically, the invention relates to an Al—Zn—Mg—Cu-based high-strength aluminum alloy thin extruded shape that may suitably be used for transport machines (e.g., airplane) and sporting goods (e.g., bat), and a method for producing the same.BACKGROUND ART[0002]A high-strength aluminum alloy (particularly an Al—Zn—Mg—Cu-based aluminum alloy) has been widely used as a material for transport machines (e.g., airplane, helicopter, and motorcycle) and sporting goods (e.g., bat), and development of an Al—Zn—Mg—Cu-based aluminum alloy thin extruded shape having a yield strength of 700 MPa or more has been desired in order to implement a further reduction in weight.[0003]A method that produces an aluminum alloy by consolidating a rapidly solidified powder obtained using an atomization method has been proposed in order to improve the strength of an Al—Zn...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C22F1/053C22C21/10
CPCC22F1/053B21C23/02C22C21/10
InventorSHINZATO, YOSHIFUMIHATTA, HIDENORI
OwnerFURUKAWA SKY ALUMINUM CORP