Aluminum 2024-T81


Subcategory: 2000 Series Aluminum Alloy; Aluminum Alloy; Metal; Nonferrous Metal

Close Analogs:

Composition Notes:
A Zr + Ti limit of 0.20 percent maximum may be used with this alloy designation for extruded and forged products only, but only when the supplier or producer and the purchaser have mutually so agreed. Agreement may be indicated, for example, by reference to a standard, by letter, by order note, or other means which allow the Zr + Ti limit.
Aluminum content reported is calculated as remainder.
Composition information provided by the Aluminum Association and is not for design.

Key Words: Aluminium 2024-T81; UNS A92024; ISO AlCu4Mg1; NF A-U4G1 (France); DIN AlCuMg2; AA2024-T81, ASME SB211; CSA CG42 (Canada)

Component   Wt. %
Al90.7 - 94.7 
CrMax 0.1 
Cu3.8 - 4.9 
FeMax 0.5 
Component   Wt. %
Mg1.2 - 1.8 
Mn0.3 - 0.9 
Other, eachMax 0.05 
Other, totalMax 0.15 
Component   Wt. %
SiMax 0.5 
TiMax 0.15 
ZnMax 0.25 

Material Notes:
Information provided by Alcoa and the references. General 2024 characteristics and uses: Good machinability and surface finish capabilities. A high strength material of adequate workability. Has largely superceded 2017 for structural applications.

Uses: Aircraft fittings, gears and shafts, bolts, clock parts, computer parts, couplings, fuse parts, hydraulic valve bodies, missile parts, munitions, nuts, pistons, rectifier parts, worm gears, fastening devices, veterinary and orthopedic equipment, structures.

Data points with the AA note have been provided by the Aluminum Association, Inc. and are NOT FOR DESIGN.

Physical PropertiesMetricEnglishComments
Density2.78 g/cc0.1 lb/in AA; Typical

Mechanical Properties
Hardness, Brinell128128 500 kg load with 10 mm ball
Hardness, Knoop161161 Converted from Brinell Hardness Value
Hardness, Rockwell A48.948.9 Converted from Brinell Hardness Value
Hardness, Rockwell B7979 Converted from Brinell Hardness Value
Hardness, Vickers146146 Converted from Brinell Hardness Value
Tensile Strength, Ultimate485 MPa70300 psi 
Tensile Strength, Yield450 MPa65300 psi 
Elongation at Break2 %2 % Foil
Elongation at Break6 %6 % In 5 cm; Sample 1.6 mm thick
Modulus of Elasticity72.4 GPa10500 ksi Average of Tension and Compression. In Aluminum alloys, the compressive modulus is typically 2% greater than the tensile modulus
Poisson's Ratio0.330.33 
Fatigue Strength125 MPa18100 psi 500,000,000 Cycles
Shear Modulus28 GPa4060 ksi 
Shear Strength295 MPa42800 psi 

Electrical Properties
Electrical Resistivity4.49e-006 ohm-cm4.49e-006 ohm-cm AA; Typical at 68F

Thermal Properties
CTE, linear 68F23.2 m/m-C12.9 in/in-F AA; Typical; Average over 68-212F range.
CTE, linear 250C24.7 m/m-C13.7 in/in-F Average over the range 20-300C
Specific Heat Capacity0.875 J/g-C0.209 BTU/lb-F 
Thermal Conductivity151 W/m-K1050 BTU-in/hr-ft-F AA; Typical at 77F
Melting Point502 - 638 C935 - 1180 F AA; Typical range based on typical composition for wrought products 1/4 inch thickness or greater. Eutectic melting is not eliminated by homogenization.
Solidus502 C935 F AA; Typical
Liquidus638 C1180 F AA; Typical

Processing Properties
Annealing Temperature413 C775 F 
Solution Temperature256 C493 F 

References for this datasheet.


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