Aluminum alloy is an important component material to ensure the safe flight of aircraft. High-strength aluminum alloy with excellent performance is mainly used in aerospace and military fields, because aerospace and military products have extremely high requirements for weight reduction. Materials with high specific strength are the preferred materials for aerospace. The main aerospace grade aluminum alloys are 7075, 2024, 2219, 7050, etc.
2024 T351 aircraft grade aluminum sheet has high strength, good machinability, heat resistance and good spot welding. Its heat treatment strengthening effect is remarkable. Its corrosion resistance can be improved by anodizing, painting or aluminum cladding. It is mainly used for aircraft skeleton components, rivets, spars, truck hubs, propeller components, bulkheads and other structural parts as well as working parts within 150 ℃.
2024 t351 Mechanical Properties | |||||||
Temper | 0.2% Yield Strength | Maximum Tensile Strength | Elongation | Brinell Hardness | Maximum Shear Strength | Fatigue Strength | |
kg/mm2 | kg/mm2 | t1.6mm(50) | d12.7mm(% | kg/mm2 | kg/mm2 | kg/mm2 | |
T351 | 8.0 | 19.0 | 20 | 22 | 47 | 125 | 9 |
T4 | 33.0 | 48.0 | 20 | 19 | 120 | 29.0 | 14.0 |
2024 T351 Chemical Properties | ||||||||
Specific gravity | Elasticity rate | Rigidity rate | Melting temperature | Specific heat 0-100 ℃ | Linear expansion rate 20-100 ℃ | Thermal conductivity 25℃ | Specific electrical resistance 20℃ | Isometric conductivity 20℃ |
2.77g/cm | 7.5kg/mm2*10 | 2.9kg/mm2*10 | 500-640°C | 0.22 cal/g.℃ | 232*10-6/℃ | 0.29 cal/am.s.℃ | 0.057 mm2/m | 30%IACS |
The main alloying element of 7xxx aluminum alloys are Zinc, usually with certain amounts of copper and magnesium. Because of the use of zinc, these alloys are the strongest of all wrought alloys, surpassing even some steels in strength. Because of this, 7xxx aluminum alloys are commonly used in the aircraft industry. Although the addition of zinc also reduces its machinability, its excellent strength makes up for these shortcomings.
7075 aluminum sheet has an excellent weight-to-strength ratio and is ideal for highly stressed parts. And it can carry out molding processing, heat treatment and other operations according to the needs. 7075 T651 means that it goes through solution heat treatment, quenching, and then artificial aging and stress release. The stretching amount of stress release is 0.5-2%.
Modern roller hearth solution treatment furnaces, pre-stretchers and ultrasonic flaw detectors are a must for the production of high-quality aerospace aluminum alloys. Some components of the aircraft wing are made of 2XXX and 7XXX aluminum alloy thick plates. The longest length of the required plate is about 38m, and the widest width is about 4100mm. Therefore, the maximum width of the rolls of the hot rolling mill can reach 4300mm, and the maximum length of the hearth of the roller hearth solution treatment can reach 40m, which can meet the needs of the aviation industry for aluminum alloy thick plates. Haomei Aluminum can make it.
Original Source:https://www.aircraftaluminium.com/a/aerospace-grade-aluminum-2024-and-7075.html
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