2xxx series aluminum alloy with high strength and high plasticity and manufacturing method thereof
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A manufacturing method and technology for aluminum alloys, which are applied to aluminum alloys, high-plastic 2xxx series aluminum alloys and their manufacturing, and high-strength fields for aviation, can solve the problems of increasing material costs and being difficult to achieve, and achieve improved plasticity, broad market prospects, and good market prospects. The effect of comprehensive mechanical properties
Inactive Publication Date: 2010-06-23
苏州有色金属研究院有限公司
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However, in order to improve the plasticity and fracture toughness of the material, the content of Fe and Si cannot be reduced without limit,
Method used
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Embodiment 1
[0026] The composition of the aluminum alloy in terms of mass percentage is: Cu 3.8wt%, Mg 1.56wt%, Mn 0.70wt%, Fe 0.20wt%, Si 0.12wt%, Zn 0.25wt%, Ti 0.15wt%, Cr 0.10wt%, the remainder The amount is Al.
[0027] The alloy ingot is subjected to homogenization heat treatment in a circulating air furnace, extruded at 450°C, and then solution treated: 493°C×1h, and then placed at room temperature to the T4 state.
Embodiment 2
[0029] The composition of the aluminum alloy in terms of mass percentage is: Cu 4.30wt%, Mg 1.41wt%, Mn 0.50wt%, Fe 0.15wt%, Si 0.20wt%, Zn 0.20wt%, Ti 0.13wt%, Cr 0.09wt%, the remaining The amount is Al.
[0030] The alloy ingot is subjected to homogenization heat treatment in a circulating air furnace, extruded at 450°C, and then solution treated: 493°C×1h, and then placed at room temperature to the T4 state.
Embodiment 3
[0032] The composition of the aluminum alloy in terms of mass percentage is: Cu 4.10wt%, Mg 1.47wt%, Mn 0.55wt%, Fe 0.20wt%, Si 0.12wt%, Zn 0.21wt%, Ti 0.15wt%, Cr 0.10wt%, the remaining The amount is Al.
[0033] The alloy ingot is subjected to homogenization heat treatment in a circulating air furnace, extruded at 450°C, and then solution treated: 493°C×1h, and then placed at room temperature to the T4 state.
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Abstract
The invention provides a 2xxx series aluminum alloy with high strength and high plasticity and a manufacturing method thereof. The aluminum alloy of the invention comprises the following components: 3.8-4.6wt% of Cu, 1.32-1.56wt% of Mg, 0.5-0.7wt% of Mn, less than or equal to 0.15wt% of Ti, less than or equal to 0.25wt% of Zn, less than or equal to 0.10wt% of Cr, less than or equal to 0.2wt% of Si and less than or equal to 0.2wt% of Fe. The manufacturing method of the aluminum alloy of the invention comprises the following steps: firstly, adding an aluminum ingot into a resistance furnace; when the melt temperature is 740-760 DEG C, adding AlCu50, AlMn10 and AlCr5 intermediate alloys, and stirring; after the temperature falls to 720-730 DEG C, adding Mg and Zn, removing slag and refining; when the temperature is 730-740 DEG C, adding Al-5Ti-B, stirring and standing for 10-25 minutes and then casting and forming; homogenizing and annealing the cast ingot at 500 DEG C for 24h, and then, extruding the cast ingot at 400-490 DEG C; carrying out solid solution on the extruded material at 490-500 DEG C for 1-2 hours; and carrying out water quenching, and putting the material at room temperature to T4 state to obtain a board. By reasonably adjusting the contents of Cu and Mg in the aluminum alloy, the material has better comprehensive mechanical properties and is an ideal material for manufacturing aviation components.
Description
technical field [0001] The invention relates to an aluminum alloy, in particular to a high-strength, high-plasticity 2xxx series aluminum alloy for aviation and a manufacturing method thereof, belonging to the technical field of non-ferrous metals. Background technique [0002] 2xxx series aluminum alloys are used in parts of aircraft that have high requirements for fracture toughness and fatigue resistance due to their medium strength and high damage tolerance, such as aircraft fuselage skins and lower wing skins in a state of tensile stress . Representative aviation 2xxx aluminum alloys include: 2024, 2124, 2324 and other aluminum alloys. [0003] In order to further improve the plasticity, fracture toughness and fatigue performance of 2xxx series aluminum alloys, the most direct method is to increase the purity of the material, that is, to reduce the content of Fe and Si impurities in the alloy. Because Fe and Si elements form coarse insoluble intermetallic compound Mg ...
Claims
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