Al-zn-cu alloy and manufacturing method thereof

Abstract

The present invention relates to an Al—Zn—Cu alloy comprising: 18 to 50 parts by weight of zinc; 0.05 to 5 parts by weight of copper; and the rest being aluminum, based on the total weight of the alloy, wherein a tensile strength is 230 to 450 MPa and an elongation is 2.75 to 10% in the cast state. According to the present invention, it is possible to provide an Al—Zn—Cu alloy having improved casting property, strength and elongation at the same time.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit under 35 USC § 119(a) of Korean Patent Application No. 10-2017-0048119 filed on Apr. 13, 2017 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes.BACKGROUND1. Field[0002]The following description relates to an Al—Zn—Cu alloy and a manufacturing method thereof and more particularly, to an Al—Zn—Cu casting alloy, a heat-treated alloy and a wrought alloy having improved castability, tensile strength and elongation at the same time, and a manufacturing method thereof.2. Description of Related Art[0003]A casting process is widely used in various fields such as in the production of electric parts, optical instruments, vehicles, spinning machines, constructions, measuring instruments and the like, particularly automobile parts.[0004]Aluminum alloys such as Al—Si alloys and Al—Mg alloys, which have excellent casting properties, have been...

AI Technical Summary

Benefits of technology

The patent is about a new Al—Zn—Cu alloy that has improved casting properties, meaning it is less likely to crack or have other issues during production. This alloy also has better moldability, meaning it can be easily shaped, as well as higher strength, elongation, and conductivity.

Problems solved by technology

Aluminum alloys such as Al—Si alloys and Al—Mg alloys, which have excellent casting properties, have been generally used as cast aluminum alloys, but their tensile strengths are low.

Such an aluminum alloy for plastic processing is excellent in plastic workability, but has a problem of poor castability in which cracking occurs during casting.

Generally, there is a problem that it is difficult to simultaneously improve the tensile strength and the elongation because there is a trade-off relationship in which one of the characteristics of the tensile strength and the elongation is attenuated when the other is improved (FIG. 1).

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