Method for producing 6000 series aluminum alloy

A manufacturing method and aluminum alloy technology, which is applied in the field of aluminum alloy materials, can solve problems such as low strength of 6000 series aluminum alloys, affecting aircraft life and safety, and sensitivity to intergranular corrosion

Inactive Publication Date: 2017-01-11
张家港市丰乐汽车设备有限公司
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Problems solved by technology

However, so far, the proportion of 6000-series aluminum alloys used in aircraft manufacturing is significantly lower than that of 7000-series and 2000-series aluminum alloys
The primary reason for this phenomenon is the relatively low strength of 6000 series aluminum alloys.
Although artificially aged to the peak state (T6), the strength of 6000-series aluminum alloys is still much lower than that of 7000-series and 2000-series aluminum alloys, which cannot reflect the advantages of weight reduction; at the same time, 6000-series aluminum alloys still have serious Inter-corrosion sensitivity, which seriously affects the life and safety of aircraft

Method used

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Embodiment 6000

[0019] The manufacturing method of the 6000 series aluminum alloy of the present embodiment is as follows:

[0020] 1. Preparation of experimental alloy ingot

[0021] (1) Preparation of alloy ingots: Melting the ingredients in a reverberatory furnace, refining and degassing, semi-continuously casting them into round bar ingots with a diameter of 105mm, and performing homogenization annealing at 540°C / 24h on the ingots, and then Cool to room temperature, then turn and peel off the skin, the final rod diameter is positioned as 100mm, and the ingredients include: 1 part by weight of Al; 1 part by weight of Mg; 1.2 parts by weight of Si; 0.8 parts by weight of Cu; 0.5 parts by weight 0.5 parts by weight of Zn; 0.12 parts by weight of Zr; and 0.1 parts by weight of Cr.

[0022] 2. Pre-aging treatment

[0023] (1) Place the 100mm alloy bar in a box-type resistance furnace for solution treatment at 550°C / 1h, and immediately carry out artificial aging treatment at 180°C after water...

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Abstract

The invention discloses a method for producing a 6000 series aluminum alloy, and the method includes (1), alloy ingot preparation; (2), pre aging treatment; (3), cold extrusion deformation; and (4), re aging treatment. Firstly through the control of the pre aging, characteristics of certain properties, quantities, sizes, shapes and distribution of matrix and grain boundary precipitate phases can be pre formed; by the control of extrusion speed and extrusion ratio for cold extrusion deformation, the matrix precipitate phase is deformed to induce dissolution to form a supersaturated solid solution, and the grain boundary precipitate phase breaks to form a continuous distribution state; and finally, re aging is controlled for re precipitation of a strengthening phase from the matrix supersaturated solid solution, so that precipitation strength effect can be further obtained on the basis of cold extrusion deformation strengthening, and dislocation accumulation ability can be improved; full spheroidization and discontinuous distribution of the grain boundary precipitate phase can be promoted, and elimination of the susceptibility to intergranular corrosion can be realized.

Description

technical field [0001] The application belongs to the technical field of aluminum alloy materials, and in particular relates to a method for manufacturing 6000 series aluminum alloys. Background technique [0002] Age-hardening aluminum alloy has low density, high specific strength, good corrosion resistance and plastic formability, and is an important lightweight structural material widely used in aircraft manufacturing, mainly including ultra-high strength 7000 series Al-Zn-Mg-Cu alloy (500-700MPa), high-strength 2000 series Al-Cu-Mg alloy (400-500MPa) and medium-strength 6000 series Al-Mg-Si-Cu alloy (300-400MPa), the representative alloy grades are 7075, 2024 and 6056. Compared with the 7000 series and 2000 series aluminum alloys, although the 6000 series aluminum alloys have the advantages of low material density and cost, ingot formability, plastic processing performance, excellent surface treatment performance and low tendency to stress corrosion cracking. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/047C22C1/02C22C21/08
Inventor 赵英
Owner 张家港市丰乐汽车设备有限公司
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