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Al-Zn-Mg-Cu alloy and preparation process

A 1. al-zn-mg-cu, preparation process technology, applied in the field of aluminum alloys, can solve the problems such as the inability to continue to increase the strength, cracking and bursting, and the inability to meet the requirements of electronic structural parts.

Inactive Publication Date: 2020-04-07
GUANGDONG HOSHION IND ALUMINUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you continue to add alloying elements for strengthening, due to the inherent solid solubility of each element in aluminum, the strength will not continue to increase, and the increase in alloying elements will affect the anodizing effect instead, resulting in numbness and dumbness after anodizing
Although the strength of conventional 7-series alloys can meet the requirements of use, because the alloy content is about 10%, the alloy content is high, and a large amount of Zn elements in the alloy participate in the anodic reaction during anodic oxidation, which will lead to loose oxide film and even crack, burst or fall off. , even if some products are not anodized after machining, the existing 7-series alloys cannot meet the small machining deformation required by electronic structural parts, and the fine surface effect after spraying and other processing cannot be mass-produced.

Method used

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  • Al-Zn-Mg-Cu alloy and preparation process
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  • Al-Zn-Mg-Cu alloy and preparation process

Examples

Experimental program
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Embodiment 1

[0051] This example provides Al-Zn-Mg-Cu alloy, described Al-Zn-Mg-Cu alloy comprises the preparation raw material of following mass percent:

[0052] Zn: 6.7~7.2%,

[0053] Mg: 1.7~2.2%,

[0054] Cu: 0.20~0.45%,

[0055] Mn: 0.15~0.30%,

[0056] Zr: 0.05~0.20%,

[0057] The balance is Al;

[0058] In the Al-Zn-Mg-Cu alloy, the mass ratio Zn / Mg of Zn and Mg is 3.0-4.0, and the total amount of elements of Zn and Mg is ≤9.2%.

[0059] Wherein, the total amount of elements of Mn and Zr is 0.20-0.40%.

[0060] The total elemental content of Fe and Si is ≤0.18%.

[0061] Si≤0.08%, Fe≤0.12%, Cr≤0.05%, Ti≤0.10%.

Embodiment 2

[0063] This example provides the preparation process of Al-Zn-Mg-Cu alloy, the steps include:

[0064] S1: Dosing according to the proportion, after melting the aluminum ingot, add zinc ingot and magnesium ingot to obtain an alloyed melt;

[0065] S2: adding a refining agent to the alloyed melt in step S1 for refining, and at the same time feeding argon gas from the bottom of the melt for stirring, exhausting and slagging;

[0066] S3: fine-tuning the composition of the melt refined in step S2 and then standing still;

[0067] S4: Deeply purifying the melt in step S3 and pouring it to obtain a green body;

[0068] S5: After the green body is heat-treated, the water mist is forcibly cooled to room temperature to obtain the Al-Zn-Mg-Cu alloy.

[0069] In step S1, the melting temperature of the aluminum ingot is 730-760°C.

[0070] In step S2, the refining temperature is 730-750° C., and the refining time is 35-45 minutes. The amount of refining agent added is 2kg per ton of ...

Embodiment 3

[0076] This example provides the material processing method of Al-Zn-Mg-Cu alloy, the steps include:

[0077] (1) Cut the alloy saw into short ingots with a length of 600-900 mm;

[0078] (2) Put the short cast ingot into the aluminum rod heating furnace, and heat the aluminum rod to 420-500°C, preferably 450°C;

[0079] (3) Extrude the short ingot, the extrusion speed (master cylinder forward speed) is 2.0-5.0mm / s, preferably 3.0-4.0mm / s; the extrusion ratio (extrusion coefficient λ) is 20- 60, preferably 25-40;

[0080] (4) On-line quenching, preferably achieved by the following steps: within 15s, pass through a water tank with a water temperature of 5-60°C, and the cooling rate of on-line quenching is greater than 30°C / s;

[0081] (5) Straighten the material by stretching, and remove the residual stress of the material at the same time, and the stretching amount is 1 to 3%;

[0082] (6) Artificial aging, the process conditions are: 120±5°C heat preservation for 20-40h. ...

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Abstract

The embodiment of the invention provides an Al-Zn-Mg-Cu alloy and a preparation process. The alloy has, in a T6 state, a tensile strength [sigma]b >= 590 MPa, a yield strength [sigma]0.2 >= 560 MPa, aspecific elongation [delta] >= 12%, has excellent anodizing performance and no continuous oxide film cracks while having high strength, and is suitable for use as a portable electronic device housingor frame structure material.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and specifically relates to an Al-Zn-Mg-Cu alloy and a preparation process. Background technique [0002] On the one hand, aluminum alloys with good mechanical properties can be obtained by adding different alloying elements to aluminum, and then undergo a series of processing and heat treatment; on the other hand, aluminum alloys can be recycled and reused, and have good processing properties. Due to the advantages of the above two aspects, aluminum alloys are widely used in the manufacture of various products. [0003] In terms of mobile phones, as the screen-to-body ratio of mobile phone screens is increasing, in order to better protect large-size screens, higher requirements are put forward for the strength and processing performance of aluminum alloy materials used for frames. The mechanical properties of existing mature 6-series aluminum alloys can only reach a level close to 400MP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/02C22C1/06C22F1/053
CPCC22C1/026C22C1/06C22C21/10C22F1/002C22F1/053
Inventor 李承波周旺漆辉煌金炯李建湘
Owner GUANGDONG HOSHION IND ALUMINUM CO LTD
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