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444.0 (444.0-T4) Cast Aluminum

444.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the T4 temper. To achieve this temper, the metal is solution heat-treated and naturally aged. 444.0 is the Aluminum Association (AA) designation for this material. Additionally, the UNS number is A04440.

It has the highest ductility among the ANSI/AA cast aluminums in the database.

The graph bars on the material properties cards below compare 444.0 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

50

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

25 %

Fatigue Strength

51 MPa 7.5 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.8 x 106 psi

Tensile Strength: Ultimate (UTS)

190 MPa 28 x 103 psi

Tensile Strength: Yield (Proof)

83 MPa 12 x 103 psi

Thermal Properties

Latent Heat of Fusion

500 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

610 °C 1130 °F

Melting Onset (Solidus)

600 °C 1120 °F

Specific Heat Capacity

900 J/kg-K 0.22 BTU/lb-°F

Thermal Conductivity

160 W/m-K 92 BTU/h-ft-°F

Thermal Expansion

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

40 % IACS

Electrical Conductivity: Equal Weight (Specific)

140 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

2.6 g/cm3 160 lb/ft3

Embodied Carbon

7.9 kg CO2/kg material

Embodied Energy

150 MJ/kg 64 x 103 BTU/lb

Embodied Water

1110 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

39 MJ/m3

Resilience: Unit (Modulus of Resilience)

49 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

53 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

28 points

Thermal Diffusivity

67 mm2/s

Thermal Shock Resistance

8.8 points

Alloy Composition

Among cast aluminum alloys, the composition of 444.0 aluminum is notable for containing a comparatively high amount of silicon (Si). Silicon is used to improve casting fluidity and lower melting temperature. It also has a strengthening effect.

Aluminum (Al) 90.5 to 93.5
Silicon (Si) 6.5 to 7.5
Iron (Fe) 0 to 0.6
Manganese (Mn) 0 to 0.35
Zinc (Zn) 0 to 0.35
Titanium (Ti) 0 to 0.25
Copper (Cu) 0 to 0.25
Magnesium (Mg) 0 to 0.1
Residuals 0 to 0.15

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

Followup Questions

Similar Alloys

Further Reading

Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993

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