Aluminum 2124-T851

Aluminum 2124-T851

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 2124-T851; UNS A92124; QQ-A-250/29; ASTM B209; AMS 4101; AA2124-T851

Component    Wt. %
Al 91.2 – 94.7
Cr Max 0.1
Cu 3.8 – 4.9
Fe Max 0.3
Component    Wt. %
Mg 1.2 – 1.8
Mn 0.3 – 0.9
Other, each Max 0.05
Other, total Max 0.15
Component    Wt. %
Si Max 0.2
Ti Max 0.15
Zn Max 0.25

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

Physical Properties

Physical Properties Metric English Comments
Density 2.78 g/cc 0.1 lb/in³  AA; Typical

Mechanical Properties

Hardness, Brinell 128 128  500 kg load with 10 mm ball
Hardness, Knoop 161 161  Converted from Brinell Hardness Value
Hardness, Rockwell A 48.9 48.9  Converted from Brinell Hardness Value
Hardness, Rockwell B 79 79  Converted from Brinell Hardness Value
Hardness, Vickers 146 146  Converted from Brinell Hardness Value
Ultimate Tensile Strength 483 MPa 70000 psi  AA; Typical
Tensile Yield Strength 441 MPa 64000 psi  AA; Typical
Elongation at Break 8 % 8 %  AA; Typical; 1/2 in. (12.7 mm) Diameter
Modulus of Elasticity 73.1 GPa 10600 ksi  AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.
Poisson’s Ratio 0.33 0.33  Estimated from trends in similar Al alloys.
Fatigue Strength 125 MPa 18100 psi  500,000,000 Cycles
Fracture Toughness 26 MPa-m½ 23.7 ksi-in½  K(IC) in S-L Direction
Fracture Toughness 26 MPa-m½ 23.7 ksi-in½  K(IC) in T-L Direction
Fracture Toughness 32 MPa-m½ 29.1 ksi-in½  K(IC) in L-T Direction
Machinability 70 % 70 %  0-100 Scale of Aluminum Alloys
Shear Modulus 27 GPa 3920 ksi  Estimated from similar Al alloys.
Shear Strength 295 MPa 42800 psi

Electrical Properties

Electrical Resistivity 4.49e-006 ohm-cm 4.49e-006 ohm-cm  AA; Typical at 68°F

Thermal Properties

CTE, linear 68°F 22.9 µm/m-°C 12.7 µin/in-°F  AA; Typical; Average over 68-212°F range.
CTE, linear 250°C 24.7 µm/m-°C 13.7 µin/in-°F  Average over the range 20-300ºC
Specific Heat Capacity 0.882 J/g-°C 0.211 BTU/lb-°F
Thermal Conductivity 151 W/m-K 1050 BTU-in/hr-ft²-°F  AA; Typical at 77°F
Melting Point 502 – 638 °C 935 – 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.
Solidus 502 °C 935 °F  AA; Typical
Liquidus 638 °C 1180 °F  AA; Typical

Processing Properties

Annealing Temperature 413 °C 775 °F
Solution Temperature 493 °C 920 °F
Aging Temperature 191 °C 375 °F