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A kind of al-zn-mg series aluminum alloy profile and preparation method thereof

An aluminum alloy profile and aluminum alloy technology, which is applied in the field of aluminum alloy processing, can solve problems such as high price of scandium, failure to meet strength requirements, poor cost performance, etc., and achieve good spalling corrosion resistance

Active Publication Date: 2020-06-16
HUNAN ORIENTAL SCANDIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

7003 and 7005 alloys have good processing and weldability, but the tensile strength is 300-350Mpa, which cannot meet the demand for higher strength
The tensile strength of 7075 and 7050 alloys is 500-600MPa, the elongation is 6-9%, and the strength is high, but the extrusion processing and weldability are poor, and there are problems of poor corrosion resistance.
Usually the amount of scandium added to aluminum alloy is 0.1-0.3wt%, the effect is good, but due to the high price of scandium, the cost performance is poor, and the material cost of a ton of aluminum alloy rods (containing 0.3% Sc) increases by 30,000, while the price of aluminum Only 14,000 / ton, the high price hinders the application of scandium

Method used

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  • A kind of al-zn-mg series aluminum alloy profile and preparation method thereof
  • A kind of al-zn-mg series aluminum alloy profile and preparation method thereof
  • A kind of al-zn-mg series aluminum alloy profile and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Prepare materials according to 4.8wt% Zn, 2.1wt% Mg, 0.3wt% Li, 0.06wt% Sc, 0.1wt% Zr, 0.3wt% Cu, 0.2wt% Mn, 0.04wt% Ti, remaining Al , where Li, Cu, Mn, Zr, Sc, Ti, B are added in the form of master alloys.

[0040] (2) Melting in an electric furnace, adding aluminum ingots first, after melting, adding Al-Cu, Al-Mn, Al-Zr, Al-Sc, Zn, Mg, Al-Li, the melting temperature is controlled at 740-760 degrees, electromagnetic Stir for 10 minutes, pass in chlorine-argon mixed gas to degas, let it stand for 15-20 minutes, remove slag, add Al-Ti-B wire online, filter through ceramic filter, semi-continuous ingot casting, control the pouring temperature at 720-740 Spend.

[0041] (3) Put the cast ingot of step (2) into an annealing furnace for homogenization annealing, the process condition is 460-480 degrees, heat preservation for 12 hours, and cool out of the furnace.

[0042] (4) Put the cast ingot of step (3) into a heating furnace, heat it to 520 degrees, and after 4 hou...

Embodiment 2

[0046] The preparation method of this example is the same as that of Example 1, the difference is that before aging, the extruded profiles are not quenched by online air, but are placed in a quenching furnace, heated to 460-480 degrees, kept for 1-2 hours, and then water-cooled Quenching, and then aging, the aging process is the same as in Example 1.

Embodiment 3

[0048] According to 4.1wt% Zn, 2.40wt% Mg, 0.5wt% Li, 0.08wt% Sc, 0.08wt% Zr, 0.8wt% Cu, 0.4wt% Mn, 0.06wt% Ti, surplus Al, prepare materials, the specific operation steps are the same In Example 1.

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Abstract

The invention provides an Al-Zn-Mg series aluminum alloy profile material and a preparing method thereof. Aluminum alloy comprises the following components in a percent by mass: 4.5-5.8% of Zn, 1.8-2.5% of Mg, 0.3-0.8% of Cu, 0.1-0.5% of Li, 0.05-0.2% of Zr, 0.03-0.3% of Sc, 0.2-0.4% of Mn, 0.03-0.06% of Ti and the balance of Al and unavoidable impurities, wherein the mass ratio of Zn to Mg is 1.8-3.2. The aluminum alloy obtained by the application has excellent comprehensive properties. After heat treatment, the tensile strength (Rm) of the aluminum alloy is 500-560MPa, the yield strength (Rp0.2) is 450-520MPa, and the elongation after fracture (As) is 10-17%; and at the same time, the weldability, the extrudable processability and the corrosion resistance are all great.

Description

technical field [0001] The invention relates to an Al-Zn-Mg series aluminum alloy profile and a preparation method thereof, belonging to the technical field of aluminum alloy processing. Background technique [0002] With the light weight requirements of rail transit and automobiles, high-strength aluminum alloys will be widely used. 7003 and 7005 alloys have good processing and weldability, but the tensile strength is 300-350Mpa, which cannot meet the demand for higher strength. The tensile strength of 7075 and 7050 alloys is 500-600MPa, the elongation is 6-9%, and the strength is high, but the extrusion processing and weldability are poor, and there are problems of poor corrosion resistance. Therefore, there is currently no aluminum alloy with better comprehensive performance, which can not only meet the higher strength requirements, but also have better extrusion processing performance, welding, corrosion resistance and so on. [0003] As we all know, scandium element i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C1/026C22C1/03C22C21/10C22F1/053
Inventor 陈卫平钱晓泰陈青松王晓平李雄飞刘应超徐定能
Owner HUNAN ORIENTAL SCANDIUM
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