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Aluminum 2124-T851
Categories: Metal; Nonferrous Metal; Aluminum Alloy; 2000 Series Aluminum Alloy
Material Notes: Data points with the AA note have been provided by the Aluminum Association, Inc. and are NOT FOR DESIGN.

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.
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; Al2124-T851
Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesOriginal ValueComments
Density 2.78 g/ccAA; Typical
 
Mechanical PropertiesOriginal ValueComments
Hardness, Brinell 128500 kg load with 10 mm ball
Hardness, Knoop 161Converted from Brinell Hardness Value
Hardness, Rockwell A 48.9Converted from Brinell Hardness Value
Hardness, Rockwell B 79Converted from Brinell Hardness Value
Hardness, Vickers 146Converted from Brinell Hardness Value
Tensile Strength, Ultimate 70.0 ksiAA; Typical
 465 MPa
@Thickness 50.8 - 76.2 mm		Short transverse
 470 MPa
@Thickness 38.1 - 50.8 mm		Short transverse
 470 MPa
@Thickness 50.8 - 76.2 mm		Long transverse
 480 MPa
@Thickness 50.8 - 76.2 mm		Longitudinal
 490 MPa
@Thickness 38.1 - 50.8 mm		Longitudinal
 490 MPa
@Thickness 38.1 - 50.8 mm		Long transverse
 2.00 MPa
@Thickness 70.0 mm,
Temperature 535 °C
 16.0 MPa
@Thickness 70.0 mm,
Temperature 480 °C
 485 MPa
@Thickness 70.0 mm,
Temperature 24.0 °C
 505 MPa
@Thickness 70.0 mm,
Temperature -28.0 °C
 525 MPa
@Thickness 70.0 mm,
Temperature -80.0 °C
 595 MPa
@Thickness 70.0 mm,
Temperature -195 °C
 705 MPa
@Thickness 70.0 mm,
Temperature -269 °C
Tensile Strength, Yield 64.0 ksiAA; Typical
 420 MPa
@Thickness 38.1 - 50.8 mm		Short transverse
 420 MPa
@Thickness 50.8 - 76.2 mm		Short transverse
 435 MPa
@Thickness 38.1 - 50.8 mm		Long transverse
 435 MPa
@Thickness 50.8 - 76.2 mm		Long transverse
 440 MPa
@Thickness 38.1 - 50.8 mm		Longitudinal
 440 MPa
@Thickness 50.8 - 76.2 mm		Longitudinal
 2.00 MPa
@Thickness 70.0 mm,
Temperature 535 °C
 12.0 MPa
@Thickness 70.0 mm,
Temperature 480 °C
 450 MPa
@Thickness 70.0 mm,
Temperature 24.0 °C
 470 MPa
@Thickness 70.0 mm,
Temperature -28.0 °C
 490 MPa
@Thickness 70.0 mm,
Temperature -80.0 °C
 545 MPa
@Thickness 70.0 mm,
Temperature -195 °C
 620 MPa
@Thickness 70.0 mm,
Temperature -269 °C
Elongation at Break 4.0 %
@Thickness 50.8 - 76.2 mm		Short transverse
 5.0 %
@Thickness 38.1 - 50.8 mm		Short transverse
 8.0 %
@Thickness 50.8 - 76.2 mm		Long transverse
 9.0 %
@Thickness 38.1 - 50.8 mm		Longitudinal
 9.0 %
@Thickness 38.1 - 50.8 mm		Long transverse
 9.0 %
@Thickness 50.8 - 76.2 mm		Longitudinal
 2.0 %
@Thickness 70.0 mm,
Temperature 535 °C
 8.0 %
@Thickness 70.0 mm,
Temperature 24.0 °C
 8.0 %
@Thickness 70.0 mm,
Temperature -80.0 °C
 8.0 %
@Thickness 70.0 mm,
Temperature -28.0 °C
 9.0 %
@Thickness 70.0 mm,
Temperature -195 °C
 10 %
@Thickness 70.0 mm,
Temperature -269 °C
 65 %
@Thickness 70.0 mm,
Temperature 480 °C
 8.0 %
@Diameter 12.7 mm		AA; Typical
Modulus of Elasticity 10600 ksiAA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.
 72.0 GPa
@Thickness 70.0 mm,
Temperature 24.0 °C
 74.0 GPa
@Thickness 70.0 mm,
Temperature -28.0 °C
 76.0 GPa
@Thickness 70.0 mm,
Temperature -80.0 °C
 81.0 GPa
@Thickness 70.0 mm,
Temperature -195 °C
Tensile Modulus 55.0 GPa
@Temperature 260 °C
 56.0 GPa
@Temperature 250 °C
 61.0 GPa
@Temperature 200 °C
 65.0 GPa
@Temperature 150 °C
 68.0 GPa
@Temperature 100 °C
 71.0 GPa
@Temperature 50.0 °C
 72.0 GPa
@Temperature 25.0 °C
Poissons Ratio 0.33Estimated from trends in similar Al alloys.
Fatigue Strength 125 MPa
@# of Cycles 5.00e+8
Fracture Toughness 26.0 MPa-m½K(IC) in S-L Direction
 26.0 MPa-m½K(IC) in T-L Direction
 32.0 MPa-m½K(IC) in L-T Direction
Machinability 70 %0-100 Scale of Aluminum Alloys
Shear Modulus 27.0 GPaEstimated from similar Al alloys.
Shear Strength 295 MPa
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 27.0 ohm-cir-mil/ft
@Temperature 20.0 °C		AA; Typical
 
Thermal PropertiesOriginal ValueComments
CTE, linear 12.7 µin/in-°F
@Temperature 20.0 - 100 °C		AA; Typical; average over range
 21.1 µm/m-°C
@Temperature -50.0 - 20.0 °C
 23.8 µm/m-°C
@Temperature 20.0 - 200 °C
 24.7 µm/m-°C
@Temperature 20.0 - 300 °C
Specific Heat Capacity 0.882 J/g-°C
Thermal Conductivity 1050 BTU-in/hr-ft²-°FAA; Typical at 77°F
Melting Point 935 - 1180 °FAA; Typical range based on typical composition for wrought products >= 1/4 in. thickness. Eutectic melting is not eliminated by homogenization.
Solidus 935 °FAA; Typical
Liquidus 1180 °FAA; Typical
 
Processing PropertiesOriginal ValueComments
Annealing Temperature 775 °F
Solution Temperature 920 °F
Aging Temperature 375 °F
 
Component Elements PropertiesOriginal ValueComments
Aluminum, Al 91.2 - 94.7 %As remainder
Chromium, Cr <= 0.10 %
Copper, Cu 3.8 - 4.9 %
Iron, Fe <= 0.30 %
Magnesium, Mg 1.2 - 1.8 %
Manganese, Mn 0.30 - 0.90 %
Other, each <= 0.05 %
Other, total <= 0.15 %
Silicon, Si <= 0.20 %
Titanium, Ti <= 0.15 %
Zinc, Zn <= 0.25 %

References for this datasheet.

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