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7075 aluminum alloy and preparation method and application thereof

An aluminum alloy and intermediate alloy technology, applied in the field of aluminum alloys, can solve the problems of weakening the deformation processing performance of materials, the mechanical properties of deformed parts, the poor stress corrosion resistance of 7075 aluminum alloys, and restricting the application of 7075 aluminum alloys, so as to reduce precipitation and precipitation. , Improve stress corrosion resistance, reduce the effect of free vacancy concentration

Active Publication Date: 2022-01-11
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, limited by the characteristics of the alloy and the preparation process, there are usually problems such as coarse and uneven structures in the 7075 aluminum alloy ingot, which seriously weakens the deformation processing performance of the material and the mechanical properties of the final deformed part.
At the same time, limited by the alloy composition, the stress corrosion resistance of 7075 aluminum alloy is poor and the quenching sensitivity is high, which seriously restricts the application of 7075 aluminum alloy.

Method used

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  • 7075 aluminum alloy and preparation method and application thereof
  • 7075 aluminum alloy and preparation method and application thereof

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preparation example Construction

[0049] Accordingly, the present application also provides the preparation method of the above 7075 aluminum alloy, including the step of: smelt and semi-continuous casting of 7075 aluminum alloy according to the composition and content of the 7075 aluminum alloy.

[0050] Among them, the raw material of 7075 aluminum alloy mainly includes: pure Al, pure Zn, pure Mg, pure Cu, pure GE, AlCr intermediate alloy, ALER intermediate alloy, ALGD intermediate alloy and Alti intermediate alloy.

[0051] In a reference, the smelting process of the present application can include adding pure Al, pure Zn, pure Cu, AlCr intermediate alloy to smelt in the smelting furnace, the melting temperature is 750-800 ° C; after being completely melted, add ALGD intermediate alloy, sufficient After stirring; 10-15 minutes, add aler intermediate alloy, thoroughly stir it; after it is completely melted, add pure GE, stir well; add pure Mg, thoroughly, thoroughly, after it is completely melted, followed by: A...

Embodiment 1

[0069] This embodiment provides a 7075 aluminum alloy ingot having a diameter of 127 mm, with a mass percentage meter, and the composition and content thereof are as follows: 5.7% ≤ zn ≤ 5.8%, 2.2% ≤ mg ≤ 2.2%, 1.2% ≤ C ≤ 1.3 %, 0.19% ≤ C ≤ 0.21%, 0.18% ≤ Er≤0.21%, 0.09% ≤ agd ≤ 0.12%, 0.04% ≤ concate ≤ 0.07%, Mn ≤ 0.15%, Si ≤ 0.25%, Fe≤0.25%, Ti ≤0.18%, other impurity elements of the single content ≤ 0.05%, and the total amount of other impurity elements is ≤0.11%, the remaining amount is Al.

[0070] The preparation process of the 7075 aluminum alloy ingot is as follows:

[0071]Slubging: According to the above chemical elements, pure Al (purity 99.95%) in the corresponding raw material, pure Zn (purity is 99.95%), pure Cu (purity is 99.5%) and Al-10CR intermediate alloy placed in a smelting furnace Heating, the initial heating temperature is 800 ° C; after the above substance is completely melted, the temperature will be reduced to 780 ° C, and the addition of the Al-10GD inter...

Embodiment 2

[0084] This embodiment provides a batch of 7075 aluminum alloy ingot having a batch of 300 mm, with a mass percentage measurement and content satisfying: 5.9% ≤ zn ≤ 6.1%, 2.2% ≤ mg ≤ 2.4%, 1.3% ≤ C ≤ 1.4 %, 0.18% ≤ C ≤ 0.2%, 0.25% ≤ EER ≤ 0.28%, 0.13% ≤ Gd ≤ 0.08%, 0.05% ≤ concate ≤ 0.08%, Mn ≤ 0.1%, Si ≤ 0.1%, Fe ≤ 0.1%, Ti ≤0.1%, other impurity elements of the single content ≤ 0.03%, the total amount of other impurity elements is ≤0.1%, the margin is Al.

[0085] The preparation process of the 7075 aluminum alloy ingot is as follows:

[0086] Pure Al (purity was 99.99%), pure Zn (purity was 99.99%), pure Cu (purity of 99.99%) and Al-10CR intermediate alloy were placed in a smelting furnace, and the initial heating temperature was set to 800 ° C, which was heated. The heating temperature was reduced to 780 ° C 8 hours. After it is completely melted, add the Al-10GD intermediate alloy to the smelting furnace, stirred for 15 min, add the Al-10er intermediate alloy, stir well 20 mi...

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Abstract

The invention discloses a 7075 aluminum alloy and a preparation method and application thereof, and belongs to the technical field of aluminum alloys. The aluminum alloy comprises the following elements: greater than or equal to 5.7% and less than or equal to 6.1% of Zn, greater than or equal to 2.1% and less than or equal to 2.4% of Mg, greater than or equal to 1.2% and less than or equal to 1.5% of Cu, greater than or equal to 0.18% and less than or equal to 0.22% of Cr, greater than or equal to of 0.05% and less than or equal to 0.35% of Er, greater than or equal to 0.05% and less than or equal to 0.25% of Gd, greater than or equal to 0.02% of less than or equal to 0.2% of Ge, greater than or equal to 0.12% and less than or equal to 0.5% of Er+Gd, greater than or equal to 0.15% and less than or equal to 0.6% of Er+Gd+Ge, less than or equal to 0.2% of Mn, less than or equal to 0.3% of Si, less than or equal to 0.3% of Fe, less than or equal to 0.2% of Ti, less than or equal to 0.05% of single content of other impurity elements, less than or equal to 0.12% of the total amount of other impurity elements, and the balance of Al. The aluminum alloy has the characteristics of low stress corrosion sensitivity, low quenching sensitivity and high strength and toughness, and can be used as a worked material of aviation equipment.

Description

Technical field [0001] Technical Field The present invention relates to an aluminum alloy, particularly, to a 7075 aluminum alloy and its preparation method and application. Background technique [0002] 7075 aluminum alloy combines high strength and toughness, and also has good fracture toughness and fatigue properties, occupies a pivotal position in the field of aviation, such as aircraft skins, spars, stringers and frames are a number of applications 7075 high Strength aluminum alloy. [0003] However, due to process limitations and preparation alloy, 7075 aluminum alloy ingot coarse microstructure there are often uneven, which seriously impair the deforming properties and mechanical properties of the final deformation member. Meanwhile, restricted by the alloy composition, of 7075 aluminum alloy resistance to stress corrosion is poor, high quench sensitivity, severely restrict the application of the 7075 aluminum alloy. [0004] In view of this, the present invention proposed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03B22D11/114B64C1/12B64C1/06B64C3/18
CPCC22C21/10C22C1/026C22C1/03B22D11/003B22D11/114B64C1/12B64C1/064B64C1/061B64C3/18B64C2001/0081
Inventor 邱阳夏鹏刘明阳李新涛周楠郑开宏
Owner GUANGDONG INST OF NEW MATERIALS
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