Why Aluminum Alloy 2024
Is the Best Material for Aircraft

 

Did You Know That Aluminum 2024 is Widely Used in Aircraft Structures?

Aluminum or aluminum alloys are strong corrosion-resistant materials. These alloys have sensitivity to high temperatures that range from 200 to 250 degrees Celsius, earning themselves the description, good low-temperature alloys. Their strength increases upon exposure to subzero temperatures and strength is diminished and lost upon exposure to high temperatures.

Aluminum 2024

Aluminum alloy 2024 is an aluminum alloy, the primary alloying element being copper. Its main use is in applications that require high strength to weight ratio and good resistance to fatigue. It has the property to be welded but only through friction welding.

Aluminum alloy 2024 is annealed from a heat-treated condition between 399 and 427 degrees Celsius for approximately 2 hours, after which it is slowly cooled in the furnace. Alternatively, aluminum alloy 2024 can be annealed between cold working operations at 343 degrees Celsius for 2 hours and cooled in air.

Applications

Aluminum alloy 2024 is one of the best known high-strength aluminum alloys attributed to its high strength and excellent resistance to fatigue. With such properties and characteristics, it is extensively and commonly used in the following applications:

  • Aircraft structural components (wing and fuselage structures under tension)
  • Aircraft fittings
  • Hardware
  • Truck wheels
  • Parts for the transportation industry
Aluminum Alloys
 

Aluminum alloy 2024 in plate forms are used in shear webs and ribs, fuselage structures, wing tension members and other structural areas that require stiffness, fatigue performance and good strength. On the other hand, aluminum alloy 2024 in sheet forms, are used in commercial and military aircraft for fuselage skins.

Machinability and Forming

This alloy has good machining properties in the heat-treated condition and in the annealed condition. Hot forming is not allowed for this aluminum alloy 2024. Aluminum 2024 alloy is age-hardening and the heat treatment process will strengthen the alloy even more.

Properties

In general, any kind of welding is not recommended for aluminum alloy 2024 because of the resulting degradation of corrosion resistance that occurs as a result of weld heat. In the event that the alloy is welded without using inert gas, the heat treatment should be repeated. Aluminum alloy 2024 can be forged but a subsequent heat treatment is needed to retain a reasonable corrosion resistance.

 

Chemical Composition
Element Content (%)
Aluminum, Al 93.50
Copper, Cu 4.4
Magnesium, Mg 1.5
Manganese, Mn 0.6
Physical Properties
Properties Metric Imperial
Density 2.77 g/cm3 0.10007 lb/in3
Melting Point 510°C 950°F
Mechanical Properties
Properties Metric Imperial
Hardness, Brinell 120 120
Hardness, Knoop 150 150
Hardness, Rockwell A 46.8 46.8
Hardness, Rockwell B 75 75
Hardness, Vickers 137 137
Ultimate Tensile Strength 469 MPa 68000 psi
Tensile Yield Strength 324 MPa 47000 psi
Elongation at Break 19 % 19 %
Elongation at Break 20 % 20 %
Modulus of Elasticity 73.1 GPa 10600 ksi
Ultimate Bearing Strength 814 MPa 118000 psi
Bearing Yield Strength 441 MPa 64000 psi
Poisson’s Ratio 0.33 0.33
Fatigue Strength 138 MPa 20000 psi
Shear Modulus 28 GPa 4060 ksi
Shear Strength 283 MPa 41000 psi

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