A kind of aluminum alloy for aircraft wall panel and preparation method of plate

An aluminum alloy and aircraft technology, which is applied in the field of aluminum alloy sheet for aircraft wall panels and its preparation, can solve the problems of difficulty in improving the comprehensive performance of the damage-resistant aluminum alloy sheet, and achieve large-scale industrial production, low cost, and reduction of crack initiation. Effect

Active Publication Date: 2022-05-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing aluminum alloys and plates for aircraft siding, adjusting the content of main alloying elements and adding new microalloying elements, combined with high temperature heat preservation + deep cooling + cold rolling treatment, to obtain anti-fatigue crack growth An aluminum alloy with high strength, high fracture toughness and excellent mechanical properties solves the problem that the comprehensive performance of the existing damage-resistant aluminum alloy sheet is difficult to improve

Method used

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  • A kind of aluminum alloy for aircraft wall panel and preparation method of plate

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Effect test

Embodiment 1

[0026] (1) The alloy composition is: Cu: 4.2%, Mg: 1.5%, Mn: 0.5%, Zr: 0.11%, Sc: 0.15%, the balance is Al and trace impurity elements, and the total content of the impurity elements is less than 0.1 %.

[0027] (2) Alloy smelting according to the designed components to obtain an ingot, and the ingot is subjected to homogenization treatment, face milling, and hot rolling to 40mm in turn;

[0028] (2) High temperature heat preservation treatment: put the rolled aluminum alloy sheet into a heating furnace for heating, the heating temperature is 480°C, and the heat preservation time is 3h;

[0029] (3) Cooling treatment: air-cooling the plate that has undergone high temperature heat preservation treatment is taken out of the furnace;

[0030] (4) Cryogenic treatment; put the plate after high temperature heat preservation and cooling treatment into an environmental box for cryogenic treatment, the cooling temperature is -90°C, and the heat preservation time is 3h;

[0031] (5) C...

Embodiment 2

[0036] (1) The alloy composition is: Cu: 4.4%, Mg: 1.5%, Mn: 0.5%, Zr: 0.11%, Sc: 0.15%, Ag: 0.2%, the balance is Al and trace impurity elements, the impurity elements The total content is less than 0.1%.

[0037] (2) carry out alloy smelting according to the designed components to obtain ingots, and sequentially carry out homogenization treatment, milling and hot rolling to 35mm of ingots;

[0038] (2) High temperature heat preservation treatment: put the rolled aluminum alloy sheet into a heating furnace for heating, the heating temperature is 490°C, and the heat preservation time is 2.5h;

[0039] (3) Cooling treatment: water mist cooling is adopted for the plate that has undergone high temperature heat preservation treatment;

[0040] (4) Cryogenic treatment; put the plate after high temperature heat preservation and cooling treatment into an environmental box for cryogenic treatment, the cooling temperature is -180°C, and the heat preservation time is 3h;

[0041] (5) C...

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Abstract

The invention relates to an aluminum alloy plate for aircraft wall panels and a preparation method thereof, belonging to the technical field of aluminum alloy plate preparation. The alloy components and weight percentages applicable to the method are: Cu 3.8-4.6%, Mg 1.2-1.8%, Mn 0.30- 0.85%, Zr 0.04-0.20%, Sc 0.05-0.30%, Ag 0.2-0.7%, any 1-2, the balance is Al and trace impurity elements, the total content of the impurity elements is less than 0.1%. The present invention aims at the 2024 aluminum alloy widely used in aircrafts, by adjusting the content of main alloying elements and adding new microalloying elements, combined with high temperature heat preservation + deep cooling + cold rolling treatment, high fatigue crack growth resistance and fracture toughness are obtained. The aluminum alloy with high and excellent mechanical properties solves the problem that it is difficult to improve the damage resistance of the existing aircraft wall panels. The aircraft wall panel aluminum alloy plate prepared by the present invention has excellent damage resistance performance, simple process, low cost, and is easy to realize large-scale industrialization Production.

Description

technical field [0001] The invention relates to an aluminum alloy plate for aircraft wall panels and a preparation method, and belongs to the technical field of preparation of aluminum alloy plates. Background technique [0002] Judging from the design ideas and material selection of various generations of aircraft at home and abroad, the wing material is mainly aluminum alloy. The wing lower wall plate is mainly designed according to the fatigue strength. Usually, the 2000 series aluminum alloy plate with medium strength, good fatigue resistance and damage resistance is selected, and its corrosion resistance (exfoliation corrosion and intergranular corrosion) is also taken into account. With the development of the new generation of aircraft durability / damage tolerance design ideas, the requirements for the reliability, service life, safety and maintainability of the main structure of the aircraft body are increasing. It is urgent to adopt high fracture toughness. , new hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/16B21C37/02C22F1/057
CPCC22C21/16B21C37/02C22F1/057
Inventor 郝敏伊琳娜臧金鑫雷越王亮
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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