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.
| Al | 90.5 to 93.5 | |
| Si | 6.5 to 7.5 | |
| Fe | 0 to 0.6 | |
| Mn | 0 to 0.35 | |
| Zn | 0 to 0.35 | |
| Ti | 0 to 0.25 | |
| Cu | 0 to 0.25 | |
| Mg | 0 to 0.1 | |
| res. | 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