High-toughness and corrosion-resistant aluminum alloy profile for aerospace and preparation method thereof

An aluminum alloy profile and aerospace technology, which is applied in the field of high toughness and corrosion-resistant aluminum alloy profiles for aerospace and its preparation, can solve the problem of high toughness and good corrosion resistance, which cannot meet high tensile strength at the same time, and cannot meet the requirements of aluminum alloy profiles. Meet the requirements of aerospace use and other issues, and achieve the effect of excellent corrosion resistance and high tensile strength

Active Publication Date: 2018-08-10
NORTHEAST LIGHT ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing aluminum alloy profiles cannot meet the requirements of aerospace use, high tensile strength, hi

Method used

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  • High-toughness and corrosion-resistant aluminum alloy profile for aerospace and preparation method thereof
  • High-toughness and corrosion-resistant aluminum alloy profile for aerospace and preparation method thereof
  • High-toughness and corrosion-resistant aluminum alloy profile for aerospace and preparation method thereof

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Experimental program
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Example Embodiment

[0040] Specific embodiment 1: This embodiment is a kind of high toughness and corrosion-resistant aluminum alloy profile for aerospace, which is composed of Cu: 1.9% to 2.2%, Mg: 2.2% to 2.6%, and Zn: 9.2% to 9.8. %, Zr: 0.10%~0.13% and the balance is made of smelting raw materials with Al.

[0041] The impurity elements such as Fe and Si in this embodiment are derived from aluminum ingots. The impurities in the aluminum alloy profile are Fe≤0.08%, Fe≤0.10%, and other single impurities≤0.05%. Impurities within this range have an effect on the performance of aluminum alloy foil. No effect.

[0042] The longitudinal tensile strength of the profile manufactured in this embodiment is 670-682N / mm 2 ; Provision of non-proportional extension strength 644-647N / mm 2 , The elongation after fracture is 11.3-13.9%; the compressive yield strength is 652-661MPa, and the fracture toughness of the profile tested according to GB / T 4161 is 33.2MPa·m 1 / 2 , According to GB / T 12966-2008 test conductivi...

Example Embodiment

[0043] Specific embodiment 2: The method for preparing a high toughness and corrosion-resistant aluminum alloy profile for aerospace use in this embodiment is carried out according to the following steps:

[0044] 1. The aluminum alloy profile is made of Cu: 1.9%~2.2%, Mg: 2.2%~2.6%, Zn: 9.2%~9.8%, Zr: 0.10%~0.13% and the balance of Al Proportionally weigh aluminum ingots, cathode copper, primary magnesium ingots, zinc ingots, and aluminum-zirconium alloy ingots as raw materials, and then smelt the raw materials in a smelting furnace to obtain an aluminum alloy melt;

[0045] 2. Casting the aluminum alloy melt obtained in step 1 into a round ingot;

[0046] 3. Remove the cast oxide scale of the round ingot at room temperature to obtain an aluminum alloy round ingot with oxide scale removed;

[0047] 4. The aluminum alloy round ingot with the oxide scale removed is kept at a temperature of 420℃~440℃ for 12h, and then heated to 470℃ for 60h. After being discharged from the furnace, it i...

Example Embodiment

[0060] Specific embodiment three: This embodiment is different from the specific embodiment two in that the aluminum alloy profile has Cu: 2.0%, Mg: 2.5%, Zn: 9.6%, Zr: 0.12% and the balance in terms of element mass percentage. Weigh the aluminum ingot, cathode copper, primary magnesium ingot, zinc ingot, and aluminum-zirconium alloy ingot as raw materials. Others are the same as the first or second embodiment.

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Abstract

The invention relates to a high-toughness and corrosion-resistant aluminum alloy profile for aerospace and a preparation method thereof. The problem that an existing aluminum alloy profile can not meet the use requirements of aerospace is solved. The aluminum alloy profile is made from smelting raw materials including Cu, Mg, Zn, Zr and Al, and the aluminum alloy profile made from an aluminum ingot, cathode copper, a primary magnesium ingot, a zinc ingot and an aluminum zirconium alloy ingot by smelting, casting, homogenizing annealing, hot extrusion, quenching, drawing and aging. According tothe high-toughness and corrosion-resistant aluminum alloy profile for the aerospace and the preparation method thereof, by optimizing of alloy composition, controlling of ingot casting quality, multi-stage homogenizing treatment technology, extrusion molding technology, and two-stage quenching and three-stage aging technology of strengthening-toughening heat treatment, the high-toughness and corrosion-resistant aluminum alloy profile is produced, the residual stress of the profile is effectively reduced by increasing the tension straightening quantity, and the subsequent machining precision of the profile is improved. The high-toughness and corrosion-resistant aluminum alloy profile for the aerospace is applied to the field of aluminum alloy profile preparation.

Description

technical field [0001] The invention relates to a high-toughness and corrosion-resistant aluminum alloy profile for aerospace and a preparation method thereof. Background technique [0002] With the rapid development of my country's aerospace industry, more stringent requirements have been put forward for basic materials. While the cross-sectional size of the extruded profile is required to be increased and the length of the fixed length is lengthened, the performance of the extruded profile is required to have a higher strength and toughness matching. Need to develop tensile strength ≥ 650MPa, yield strength ≥ 610MPa, compressive yield strength ≥ 620MPa, elongation ≥ 8%, fracture toughness ≥ 33KIC / MPa m 1 / 2 , Conductivity ≥ 37% IACS high comprehensive index cross-sectional area ≥ 50cm 2 , profiles with a length ≥ 12m, and form a stable production process. It is difficult to balance the tensile strength, toughness and corrosion resistance of existing aluminum alloy profile...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C1/026C22C1/03C22C21/10C22F1/002C22F1/053
Inventor 吕丹吕新宇任伟才王金花王英君佟有志高新宇徐晨光刘有金张磊孙黎明
Owner NORTHEAST LIGHT ALLOY CO LTD
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