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707.0-T7 Cast Aluminum

707.0-T7 aluminum is 707.0 aluminum in the T7 temper. To achieve this temper, the metal is solution heat-treated and stabilized by artificial overaging. It has the highest strength compared to the other variants of 707.0 aluminum.

The graph bars on the material properties cards below compare 707.0-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

80

Elastic (Young's, Tensile) Modulus

70 GPa 10 x 106 psi

Elongation at Break

1.7 %

Fatigue Strength

83 MPa 12 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.8 x 106 psi

Tensile Strength: Ultimate (UTS)

300 MPa 44 x 103 psi

Tensile Strength: Yield (Proof)

250 MPa 36 x 103 psi

Thermal Properties

Latent Heat of Fusion

380 J/g

Maximum Temperature: Mechanical

180 °C 360 °F

Melting Completion (Liquidus)

630 °C 1170 °F

Melting Onset (Solidus)

600 °C 1110 °F

Solidification (Pattern Maker's) Shrinkage

1.6 %

Specific Heat Capacity

880 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

150 W/m-K 85 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

37 % IACS

Electrical Conductivity: Equal Weight (Specific)

110 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

2.9 g/cm3 180 lb/ft3

Embodied Carbon

8.3 kg CO2/kg material

Embodied Energy

150 MJ/kg 64 x 103 BTU/lb

Embodied Water

1140 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

4.7 MJ/m3

Resilience: Unit (Modulus of Resilience)

430 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

47 points

Strength to Weight: Axial

29 points

Strength to Weight: Bending

34 points

Thermal Diffusivity

58 mm2/s

Thermal Shock Resistance

13 points

Alloy Composition

Aluminum (Al)Al 90.5 to 93.6
Zinc (Zn)Zn 4.0 to 4.5
Magnesium (Mg)Mg 1.8 to 2.4
Manganese (Mn)Mn 0.4 to 0.6
Iron (Fe)Fe 0 to 0.8
Chromium (Cr)Cr 0.2 to 0.4
Titanium (Ti)Ti 0 to 0.25
Silicon (Si)Si 0 to 0.2
Copper (Cu)Cu 0 to 0.2
Residualsres. 0 to 0.15

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

Followup Questions

Further Reading

ASTM B618: Standard Specification for Aluminum-Alloy Investment Castings

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

ASTM B26: Standard Specification for Aluminum-Alloy Sand Castings

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015