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2218-T72 Aluminum

2218-T72 aluminum is 2218 aluminum in the T72 temper. To achieve this temper, the metal is solution heat-treated and stabilized by artificial overaging. Unlike T7 temper, this is done by the receiver rather than the supplier.

The graph bars on the material properties cards below compare 2218-T72 aluminum to: 2000-series alloys (top), all aluminum alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

95

Elastic (Young's, Tensile) Modulus

73 GPa 11 x 106 psi

Elongation at Break

10 %

Fatigue Strength

110 MPa 16 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 4.0 x 106 psi

Shear Strength

210 MPa 30 x 103 psi

Tensile Strength: Ultimate (UTS)

330 MPa 48 x 103 psi

Tensile Strength: Yield (Proof)

260 MPa 37 x 103 psi

Thermal Properties

Latent Heat of Fusion

390 J/g

Maximum Temperature: Mechanical

220 °C 430 °F

Melting Completion (Liquidus)

640 °C 1180 °F

Melting Onset (Solidus)

510 °C 940 °F

Specific Heat Capacity

870 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

140 W/m-K 81 BTU/h-ft-°F

Thermal Expansion

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

37 % IACS

Electrical Conductivity: Equal Weight (Specific)

110 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

3.1 g/cm3 190 lb/ft3

Embodied Carbon

8.2 kg CO2/kg material

Embodied Energy

150 MJ/kg 64 x 103 BTU/lb

Embodied Water

1130 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

31 MJ/m3

Resilience: Unit (Modulus of Resilience)

450 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

45 points

Strength to Weight: Axial

30 points

Strength to Weight: Bending

34 points

Thermal Diffusivity

52 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Aluminum (Al)Al 88.8 to 93.6
Copper (Cu)Cu 3.5 to 4.5
Nickel (Ni)Ni 1.7 to 2.3
Magnesium (Mg)Mg 1.2 to 1.8
Iron (Fe)Fe 0 to 1.0
Silicon (Si)Si 0 to 0.9
Zinc (Zn)Zn 0 to 0.25
Manganese (Mn)Mn 0 to 0.2
Chromium (Cr)Cr 0 to 0.1
Residualsres. 0 to 0.15

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Further Reading

ASTM B247: Standard Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring Forgings

Iron in Aluminium Alloys: Impurity and Alloying Element, N. A. Belov et al., 2002

Aluminum Standards and Data, Aluminum Association Inc., 2013

ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993