242.0-T7 Cast Aluminum
242.0-T7 aluminum is 242.0 aluminum in the T7 temper. To achieve this temper, the metal is solution heat-treated and stabilized by artificial overaging. It has the highest ductility compared to the other variants of 242.0 aluminum.
The graph bars on the material properties cards below compare 242.0-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
75
Elastic (Young's, Tensile) Modulus
73 GPa 11 x 106 psi
Elongation at Break
1.5 %
Fatigue Strength
70 MPa 10 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
27 GPa 4.0 x 106 psi
Shear Strength
170 MPa 24 x 103 psi
Tensile Strength: Ultimate (UTS)
240 MPa 35 x 103 psi
Tensile Strength: Yield (Proof)
200 MPa 29 x 103 psi
Thermal Properties
Latent Heat of Fusion
390 J/g
Maximum Temperature: Mechanical
210 °C 400 °F
Melting Completion (Liquidus)
640 °C 1180 °F
Melting Onset (Solidus)
530 °C 990 °F
Solidification (Pattern Maker's) Shrinkage
1.3 %
Specific Heat Capacity
870 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
150 W/m-K 84 BTU/h-ft-°F
Thermal Expansion
22 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
38 % IACS
Electrical Conductivity: Equal Weight (Specific)
110 % IACS
Otherwise Unclassified Properties
Base Metal Price
12 % relative
Calomel Potential
-650 mV
Density
3.1 g/cm3 190 lb/ft3
Embodied Carbon
8.3 kg CO2/kg material
Embodied Energy
150 MJ/kg 64 x 103 BTU/lb
Embodied Water
1130 L/kg 130 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
3.4 MJ/m3
Resilience: Unit (Modulus of Resilience)
270 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
45 points
Strength to Weight: Axial
22 points
Strength to Weight: Bending
28 points
Thermal Diffusivity
54 mm2/s
Thermal Shock Resistance
10 points
Alloy Composition
| Al | 88.4 to 93.6 | |
| Cu | 3.5 to 4.5 | |
| Ni | 1.7 to 2.3 | |
| Mg | 1.2 to 1.8 | |
| Fe | 0 to 1.0 | |
| Si | 0 to 0.7 | |
| Mn | 0 to 0.35 | |
| Zn | 0 to 0.35 | |
| Cr | 0 to 0.25 | |
| Ti | 0 to 0.25 | |
| res. | 0 to 0.15 |
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
ASTM B26: Standard Specification for Aluminum-Alloy Sand 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