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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, high toughness and good corrosion resistance at the same time, and provide a high-toughness and corrosion-resistant aluminum alloy for aerospace Profiles and their preparation methods

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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specific Embodiment approach 1

[0040] Specific implementation mode 1: In this implementation mode, a high-toughness and corrosion-resistant aluminum alloy profile for aerospace is composed of Cu: 1.9% to 2.2%, Mg: 2.2% to 2.6%, and Zn: 9.2% to 9.8% by mass. %, Zr: 0.10% to 0.13%, and the balance is made of smelted raw materials of Al.

[0041] The impurity elements such as Fe and Si in this embodiment originate from aluminum ingots, and the impurities in the aluminum alloy profiles are Fe≤0.08%, Fe≤0.10%, and other single impurities≤0.05%. No effect.

[0042] The longitudinal tensile strength of the profiles manufactured in this embodiment is 670-682N / mm 2 ;Standard non-proportional extension strength 644-647N / mm 2 , the elongation after breaking 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 conductivity 37.2 ~ 38.2% IACS, according to HB5455 test exfoliation corrosi...

specific Embodiment approach 2

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

[0044] 1. Aluminum alloy profiles are composed of elements with mass percentages of Cu: 1.9% to 2.2%, Mg: 2.2% to 2.6%, Zn: 9.2% to 9.8%, Zr: 0.10% to 0.13%, and the balance is Al Proportionally weigh aluminum ingots, cathode copper, primary magnesium ingots, zinc ingots, and aluminum-zirconium alloy ingots as raw materials, and then melt the raw materials in a melting furnace to obtain aluminum alloy melts;

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

[0046] 3. Remove the casting scale of the round ingot at room temperature to obtain an aluminum alloy round ingot from which the scale has been removed;

[0047] 4. Heat the aluminum alloy round ingot with the scale removed at a temperature of 420°C to 440°C for 12 hours, then heat it up ...

specific Embodiment approach 3

[0060] Specific embodiment 3: The difference between this embodiment and specific embodiment 2 is that the aluminum alloy profiles are Cu: 2.0%, Mg: 2.5%, Zn: 9.6%, Zr: 0.12% and the balance according to the mass percentage of elements The proportion of Al is weighed and weighed to take aluminum ingots, cathode copper, primary magnesium ingots, zinc ingots, and aluminum-zirconium alloy ingots as raw materials. Others are the same as those in Embodiment 1 or 2.

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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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