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. %
Al91.2 - 94.7 
CrMax 0.1 
Cu3.8 - 4.9 
FeMax 0.3 
Component   Wt. %
Mg1.2 - 1.8 
Mn0.3 - 0.9 
Other, eachMax 0.05 
Other, totalMax 0.15 
Component   Wt. %
SiMax 0.2 
TiMax 0.15 
ZnMax 0.25 

Material Notes:
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
Ultimate Tensile Strength483 MPa70000 psi AA; Typical
Tensile Yield Strength441 MPa64000 psi AA; Typical
Elongation at Break8 %8 % AA; Typical; 1/2 in. (12.7 mm) Diameter
Modulus of Elasticity73.1 GPa10600 ksi AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.
Poisson's Ratio0.330.33 Estimated from trends in similar Al alloys.
Fatigue Strength125 MPa18100 psi 500,000,000 Cycles
Fracture Toughness26 MPa-m23.7 ksi-in K(IC) in S-L Direction
Fracture Toughness26 MPa-m23.7 ksi-in K(IC) in T-L Direction
Fracture Toughness32 MPa-m29.1 ksi-in K(IC) in L-T Direction
Machinability70 %70 % 0-100 Scale of Aluminum Alloys
Shear Modulus27 GPa3920 ksi Estimated from similar Al alloys.
Shear Strength295 MPa42800 psi 

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

Thermal Properties
CTE, linear 68F22.9 m/m-C12.7 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 Capacity0.882 J/g-C0.211 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 Temperature493 C920 F 
Aging Temperature191 C375 F 

References for this datasheet.

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