296.0-T7 Cast Aluminum
296.0-T7 aluminum is 296.0 aluminum in the T7 temper. To achieve this temper, the metal is solution heat-treated and stabilized by artificial overaging. The graph bars on the material properties cards below compare 296.0-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
Elastic (Young's, Tensile) Modulus
72 GPa 10 x 106 psi
Elongation at Break
3.9 %
Fatigue Strength
47 MPa 6.9 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
27 GPa 3.9 x 106 psi
Tensile Strength: Ultimate (UTS)
260 MPa 38 x 103 psi
Tensile Strength: Yield (Proof)
130 MPa 19 x 103 psi
Thermal Properties
Latent Heat of Fusion
420 J/g
Maximum Temperature: Mechanical
170 °C 340 °F
Melting Completion (Liquidus)
630 °C 1170 °F
Melting Onset (Solidus)
540 °C 1000 °F
Specific Heat Capacity
870 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
150 W/m-K 85 BTU/h-ft-°F
Thermal Expansion
22 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
37 % IACS
Electrical Conductivity: Equal Weight (Specific)
110 % IACS
Otherwise Unclassified Properties
Base Metal Price
11 % relative
Density
3.0 g/cm3 190 lb/ft3
Embodied Carbon
7.8 kg CO2/kg material
Embodied Energy
150 MJ/kg 63 x 103 BTU/lb
Embodied Water
1110 L/kg 130 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
8.6 MJ/m3
Resilience: Unit (Modulus of Resilience)
120 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
46 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
31 points
Thermal Diffusivity
56 mm2/s
Thermal Shock Resistance
12 points
Alloy Composition
| Al | 89 to 94 | |
| Cu | 4.0 to 5.0 | |
| Si | 2.0 to 3.0 | |
| Fe | 0 to 1.2 | |
| Zn | 0 to 0.5 | |
| Mn | 0 to 0.35 | |
| Ni | 0 to 0.35 | |
| Ti | 0 to 0.25 | |
| Mg | 0 to 0.050 | |
| res. | 0 to 0.35 |
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
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