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242.0-T7 Cast Aluminum

242.0-T7 aluminum is 242.0 aluminum in the T7 temper. To achieve this temper, the metal is solution heat-treated and stabilized by artificial overaging. It has the highest ductility compared to the other variants of 242.0 aluminum.

The graph bars on the material properties cards below compare 242.0-T7 aluminum to: ANSI/AA cast aluminums (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

75

Elastic (Young's, Tensile) Modulus

73 GPa 11 x 106 psi

Elongation at Break

1.5 %

Fatigue Strength

70 MPa 10 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 4.0 x 106 psi

Shear Strength

170 MPa 24 x 103 psi

Tensile Strength: Ultimate (UTS)

240 MPa 35 x 103 psi

Tensile Strength: Yield (Proof)

200 MPa 29 x 103 psi

Thermal Properties

Latent Heat of Fusion

390 J/g

Maximum Temperature: Mechanical

210 °C 400 °F

Melting Completion (Liquidus)

640 °C 1180 °F

Melting Onset (Solidus)

530 °C 990 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

870 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

150 W/m-K 84 BTU/h-ft-°F

Thermal Expansion

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

38 % IACS

Electrical Conductivity: Equal Weight (Specific)

110 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Calomel Potential

-650 mV

Density

3.1 g/cm3 190 lb/ft3

Embodied Carbon

8.3 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)

3.4 MJ/m3

Resilience: Unit (Modulus of Resilience)

270 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

45 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

28 points

Thermal Diffusivity

54 mm2/s

Thermal Shock Resistance

10 points

Alloy Composition

Aluminum (Al)Al 88.4 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 0.7
Manganese (Mn)Mn 0 to 0.35
Zinc (Zn)Zn 0 to 0.35
Chromium (Cr)Cr 0 to 0.25
Titanium (Ti)Ti 0 to 0.25
Residualsres. 0 to 0.15

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

Followup Questions

Further Reading

ASTM B108: Standard Specification for Aluminum-Alloy Permanent Mold Castings

ASTM B26: Standard Specification for Aluminum-Alloy Sand Castings

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

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993