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A kind of 7075 aluminum alloy and its preparation method and application

An aluminum alloy and intermediate alloy technology, applied in the field of aluminum alloy, 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 alloy, and restricting the application of 7075 aluminum alloy, so as to reduce precipitation and precipitation , Improve stress corrosion resistance, reduce the effect of free vacancy concentration

Active Publication Date: 2022-07-12
GUANGDONG INST OF NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of 7075 aluminum alloy and its preparation method and application
  • A kind of 7075 aluminum alloy and its preparation method and application

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preparation example Construction

[0049] Correspondingly, the present application also provides a method for preparing the above-mentioned 7075 aluminum alloy, comprising the following steps: according to the element composition and content of the 7075 aluminum alloy, smelting and semi-continuously casting the raw material of the 7075 aluminum alloy.

[0050] Among them, the raw materials of 7075 aluminum alloy mainly include: pure Al, pure Zn, pure Mg, pure Cu, pure Ge, AlCr master alloy, AlEr master alloy, AlGd master alloy and AlTi master alloy.

[0051] For reference, the smelting process of the present application may include: adding pure Al, pure Zn, pure Cu, and AlCr master alloys into a smelting furnace for smelting, and the smelting temperature is 750-800°C; Stir; after 10-15 minutes, add AlEr master alloy and stir well; after complete melting, add pure Ge and stir well; add pure Mg after 20-25 minutes and stir well; after complete melting, perform the following operations in sequence: Add refining ag...

Embodiment 1

[0069] This embodiment provides a 7075 aluminum alloy ingot with a diameter of 127 mm. In terms of mass percentage, its element composition and content are as follows: 5.7%≤Zn≤5.8%, 2.1%≤Mg≤2.2%, 1.2%≤Cu≤1.3 %, 0.19%≤Cr≤0.21%, 0.18%≤Er≤0.21%, 0.09%≤Gd≤0.12%, 0.04%≤Ge≤0.07%, Mn≤0.15%, Si≤0.25%, Fe≤0.25%, Ti ≤0.18%, the individual content of other impurity elements is ≤0.05%, and the total amount of other impurity elements is ≤0.11%, and the balance is Al.

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

[0071]Smelting: According to the composition of the above chemical elements, pure Al (purity of 99.95%), pure Zn (purity of 99.95%), pure Cu (purity of 99.95%) and Al-10Cr master alloy in the corresponding raw materials are placed in a smelting furnace Heating, the initial heating temperature is 800 °C; after the above substances are completely melted, the temperature is lowered to 780 °C, and at this time, the Al-10Gd master alloy is added to ...

Embodiment 2

[0084] This embodiment provides a batch of 7075 aluminum alloy ingots with a diameter of 300 mm. In terms of mass percentage, the element composition and content satisfy: 5.9%≤Zn≤6.1%, 2.2%≤Mg≤2.4%, 1.3%≤Cu≤1.4 %, 0.18%≤Cr≤0.2%, 0.25%≤Er≤0.28%, 0.13%≤Gd≤0.16%, 0.05%≤Ge≤0.08%, Mn≤0.1%, Si≤0.1%, Fe≤0.1%, Ti ≤0.1%, the individual content of other impurity elements is ≤0.03%, the total amount of other impurity elements is ≤0.1%, and the balance is Al.

[0085] The preparation process of this batch of 7075 aluminum alloy ingots is as follows:

[0086] Put pure Al (purity of 99.99%), pure Zn (purity of 99.99%), pure Cu (purity of 99.99%) and Al-10Cr master alloy in a melting furnace for heating. The initial heating temperature is set to 800°C. The heating temperature was lowered to 780°C for 8 hours. After it is completely melted, add the Al-10Gd master alloy to the melting furnace first, after fully stirring for 15 minutes, add the Al-10Er master alloy, and fully stir the melt fo...

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Abstract

The invention discloses a 7075 aluminum alloy and a preparation method and application thereof, belonging to the technical field of aluminum alloys. The element composition and content of the aluminum alloy are as follows: 5.7%≤Zn≤6.1%, 2.1%≤Mg≤2.4%, 1.2%≤Cu≤1.5%, 0.18%≤Cr≤0.22%, 0.05%≤Er≤0.35%, 0.05%≤Gd≤0.25%, 0.02%≤Ge≤0.2%, 0.12%≤Er+Gd≤0.5%, 0.15%≤Er+Gd+Ge≤0.6%, Mn≤0.2%, Si≤0.3%, Fe≤ 0.3%, Ti≤0.2%, individual content of other impurity elements≤0.05%, total amount of other impurity elements≤0.12%, and the balance is 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 processing material for aviation equipment.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a 7075 aluminum alloy and a preparation method and application thereof. Background technique [0002] 7075 aluminum alloy has both high strength and toughness, as well as good fracture toughness and fatigue performance, and occupies a pivotal position in the aviation field, such as aircraft skins, spars, long trusses and frames are widely used. 7075 high strength and tough aluminum alloy. [0003] However, due to the limitation of alloy characteristics and preparation process, there are usually problems such as coarse and uneven structure in 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, 7075 aluminum alloy has poor stress corrosion resistance and high quenching sensitivity, which seriously restricts the ...

Claims

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Application Information

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Patent Type & Authority Patents(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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