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A deformed aluminum alloy without coarse grains and its preparation method and product

A technology for deforming aluminum alloys and aluminum alloy melts, which is applied in the field of metal materials and can solve problems such as fatigue performance degradation, material mechanical properties degradation, and surface unevenness

Active Publication Date: 2021-08-20
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the mobility requirements of my country's weapons and equipment become higher and higher, higher requirements are placed on lightweight materials such as aluminum alloys, especially Al-Zn-Mg-Cu-based rods, profiles and plates. In the medium, it is easy to produce coarse grains, resulting in a significant decrease in the mechanical properties of the material, a significant decrease in tensile strength and elongation, a decrease in fatigue performance, a decrease in corrosion resistance, and uneven material properties.
At the same time, in the subsequent surface treatment process, the surface after anodization is often uneven due to the existence of coarse grains, which seriously affects the performance of the material.

Method used

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  • A deformed aluminum alloy without coarse grains and its preparation method and product
  • A deformed aluminum alloy without coarse grains and its preparation method and product
  • A deformed aluminum alloy without coarse grains and its preparation method and product

Examples

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preparation example Construction

[0065] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0066] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0067] The preparation materials used in the following examples are as follows:

[0068] Pure metal aluminum is Al99.993, and the element content requirements meet the requirements of GB / T 8644-2000;

[0069] Pure metal zinc is Zn99.99, and the el...

Embodiment 1

[0081] A method for preparing a deformed aluminum alloy without coarse grains of the present invention comprises the following steps:

[0082] 1) Weigh the raw materials according to the obtained deformed aluminum alloy without coarse grains containing the following elements by weight percentage (the raw materials are as above), Zn: 4.7%, Mg: 1.1%, Cu: 1.1%, V: 0.6%, Zr : 0.07%, Li: 0.07%, Ti: 0.07%, Mn: 0.01%, Hf: 0.09%, B: 0.01%, Be: 0.007%, impurity elements: 0.08% (specifically Fe: 0.03%, Si: 0.02 %, Sn: 0.01%, Pb: 0.02%), the balance is Al;

[0083] 2) Melt and put in pure aluminum ingots, pure zinc ingots, pure copper ingots, Al-V master alloys, Al-Zr master alloys, Al-Ti master alloys, Al-B master alloys, Al-Mn master alloys, Al- For Hf master alloy, heat the furnace to raise the temperature of the furnace to 720°C, keep it warm for 1 hour, and stir for 30 minutes;

[0084] 3) Lower the temperature to lower the temperature of the furnace to 680°C, add pure magnesium i...

Embodiment 2

[0090] A method for preparing a deformed aluminum alloy without coarse grains of the present invention comprises the following steps:

[0091] 1) Weigh the raw materials according to the obtained deformed aluminum alloy without coarse grains containing the following elements by weight percentage (the raw materials are as above), Zn: 5.3%, Mg: 1.3%, Cu: 0.9%, V: 0.5%, Zr : 0.10%, Li: 0.05%, Ti: 0.09%, Mn: 0.02%, Hf: 0.11%, B: 0.02%, Be: 0.01%, impurity elements: 0.05% (specifically Fe: 0.01%, Si: 0.01 %, Sn: 0.01%, Pb: 0.02%), the balance is Al;

[0092] 2) Melt and put in pure aluminum ingots, pure zinc ingots, pure copper ingots, Al-V master alloys, Al-Zr master alloys, Al-Ti master alloys, Al-B master alloys, Al-Mn master alloys, Al- For Hf master alloy, heat the furnace to raise the temperature of the furnace to 730°C, keep it warm for 1.5h, and stir for 20min;

[0093] 3) Lower the temperature to lower the temperature of the furnace to 695°C, add pure magnesium ingots, A...

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Abstract

The invention provides a deformed aluminum alloy without coarse grains and its preparation method and product. In the deformed aluminum alloy without coarse grains of the present invention, Al, V, Mn, Zr, Li, Ti, and Hf are formed in the alloy matrix Dispersed and fine nano-scale precipitates are produced. These precipitates have good thermal stability and can effectively pin grain boundaries and dislocations, inhibit grain coarsening and re-fine grain during extrusion, and improve matrix strength at the same time. B element can be combined with Ti to effectively refine the grain; Be element can form a dense oxide film on the surface of molten aluminum to further prevent the burning of Al / Mg / Zn / Li elements; at the same time, through multi-level homogenization treatment system, online water shower, Higher extrusion barrel temperature and slower extrusion speed can effectively inhibit the formation of coarse grains. The coarse-grain-free deformed aluminum alloy of the present invention has no coarse-grain structure observed under low magnification, and the tensile strength and elongation of the center and edge of the extruded bar are basically consistent, up to 558-592 MPa, and the elongation is 13.9‑15.1%, the fatigue life exceeds 10 7 Second-rate.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a deformed aluminum alloy without coarse grains, a preparation method thereof and products (such as rods, profiles or plates). Background technique [0002] Al-Zn-Mg-Cu series aluminum alloys are a kind of heat-treatable and strengthened ultra-high-strength aluminum alloys. Due to their good ductility, fracture toughness and fatigue properties, they have been widely used in aviation, aerospace, electronics and other fields, especially their rods. Materials, profiles, plates and forgings have been used as aircraft girders, skins, rivets, connecting parts of missile cabins, radar frames, etc. However, as the mobility requirements of my country's weapons and equipment are getting higher and higher, higher requirements are put forward for lightweight materials such as aluminum alloys, especially Al-Zn-Mg-Cu-based rods, profiles and plates. In the middle, coarse grains are easil...

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 黄粒何维维戴圣龙王亮
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS