The aluminium copper alloy 2024 is competitive on a strength-to-weight ratio with the higher-strength but heavier titanium and steel alloys and thus has traditionally been the dominant structural material in both commercial and military aircraft. In addition, aluminium alloys are not embrittled at low temperatures and become even stronger as the temperature is decreased, without significant ductility losses, making them ideal for cryogenic fuel tanks for rockets and launch vehicles. The wrought heat treatable 2xxx alloys generally contain magnesium in addition to copper as an alloying element.
Aluminium has many outstanding attributes that lead to a wide range of applications including:
- Good corrosion and oxidation resistance
- High electrical and thermal conductivities
- Low density
- High reflectivity
- High ductility and reasonably high strength
- Relatively low cost
2xxx: Al-Cu Alloys.
The major characteristics of the 2xxx series are:
- Heat treatable
- High strength at room and elevated temperatures
- Typical ultimate tensile strength range: 186–428 MPa (27–62 ksi)
- Usually joined mechanically, but some alloys are weldable
- Not as corrosion resistant as other alloys
Due to their superior damage tolerance and good resistance to fatigue crack growth, the 2xxx alloys are used for aircraft fuselage skins for lower wing skins on commercial aircraft. The alloy 2024-T3 is normally selected for tension-tension applications because it has superior fatigue performance in the 105 cycle range as compared to the 7xxx alloys.
Tube, Aluminum Alloy, Drawn, Seamless
Aluminum Alloy 2024, Plate and Sheet
Aluminum Alloy Alclad 2024, Plate and Sheet
Aluminum Alloy 2024, Bar, Rod, Shapes, Tube, and Wire, Extruded
Aluminum Alloy, 2024, Bar, Rod, and Wire; Rolled, Drawn, or Cold Finished
Aluminum Alloy, Extrusions 4.4Cu – 1.5Mg – 0.60Mn (2024-T3511) Solution Heat Treated, Cold Worked, Stress-Relieved by Stretching, and Straightened
Aluminum Alloy, Rolled or Cold Finished Bars, Rods, and Wire 4.4Cu - 1.5Mg - 0.60Mn (2024) Solution Heat Treated and Naturally Aged (T4) Solution Heat Treated, Cold Worked, and Naturally Aged (T351)
Aluminum Alloy, Drawn, Seamless Tubing 4.4Cu - 1.5Mg - 0.60Mn (2024-T3) Solution Heat Treated and Cold Worked
A four-digit numerical designation system, developed by the Aluminium Association, is used to designate wrought aluminium and aluminium alloys. The first digit defines the major alloying element in the 2xxx through 8xxx alloy series, the second digit in the designation indicates the alloy modification. When the second digit is zero, it indicates the original alloy. The numbers 1 through 9, assigned consecutively, indicate modifications of the original alloy. Explicit rules have been established for determining whether a proposed composition is merely a modification of a previously registered alloy or if it is an entirely new alloy. The last two of the four digits in the 2xxx through 8xxx series have no special significance but serve only to identify the different alloys in the series.