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771.0-T51 Cast Aluminum

771.0-T51 aluminum is 771.0 aluminum in the T51 temper. To achieve this temper, the metal is artificially underaged. The degree of underaging is different from T53 and T54. It has the lowest strength and second highest ductility compared to the other variants of 771.0 aluminum.

The graph bars on the material properties cards below compare 771.0-T51 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

85

Elastic (Young's, Tensile) Modulus

70 GPa 10 x 106 psi

Elongation at Break

3.4 %

Fatigue Strength

92 MPa 13 x 103 psi

Poisson's Ratio

0.32

Shear Modulus

26 GPa 3.8 x 106 psi

Tensile Strength: Ultimate (UTS)

250 MPa 36 x 103 psi

Tensile Strength: Yield (Proof)

210 MPa 31 x 103 psi

Thermal Properties

Latent Heat of Fusion

380 J/g

Maximum Temperature: Mechanical

180 °C 350 °F

Melting Completion (Liquidus)

630 °C 1160 °F

Melting Onset (Solidus)

620 °C 1150 °F

Solidification (Pattern Maker's) Shrinkage

1.6 %

Specific Heat Capacity

870 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

140 W/m-K 80 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

27 % IACS

Electrical Conductivity: Equal Weight (Specific)

82 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

3.0 g/cm3 190 lb/ft3

Embodied Carbon

8.0 kg CO2/kg material

Embodied Energy

150 MJ/kg 64 x 103 BTU/lb

Embodied Water

1130 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

7.9 MJ/m3

Resilience: Unit (Modulus of Resilience)

320 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

46 points

Strength to Weight: Axial

23 points

Strength to Weight: Bending

29 points

Thermal Diffusivity

54 mm2/s

Thermal Shock Resistance

11 points

Alloy Composition

Aluminum (Al)Al 90.5 to 92.5
Zinc (Zn)Zn 6.5 to 7.5
Magnesium (Mg)Mg 0.8 to 1.0
Titanium (Ti)Ti 0.1 to 0.2
Chromium (Cr)Cr 0.060 to 0.2
Silicon (Si)Si 0 to 0.15
Iron (Fe)Fe 0 to 0.15
Manganese (Mn)Mn 0 to 0.1
Copper (Cu)Cu 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 B618: Standard Specification for Aluminum-Alloy Investment Castings

ASTM B26: Standard Specification for Aluminum-Alloy Sand Castings

Handbook of Aluminum vol. 2: Alloy Production and Materials Manufacturing, George Totten and D. Scott MacKenzie (editors), 2003

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