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7021 Aluminum vs. 8079 Aluminum

Both 7021 aluminum and 8079 aluminum are aluminum alloys. They have a moderately high 93% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is 8079 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
69
Elongation at Break, % 9.4
2.2
Fatigue Strength, MPa 150
56
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
26
Tensile Strength: Ultimate (UTS), MPa 460
150
Tensile Strength: Yield (Proof), MPa 390
120

Thermal Properties

Latent Heat of Fusion, J/g 380
400
Maximum Temperature: Mechanical, °C 200
170
Melting Completion (Liquidus), °C 630
650
Melting Onset (Solidus), °C 510
640
Specific Heat Capacity, J/kg-K 870
900
Thermal Conductivity, W/m-K 150
230
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
58
Electrical Conductivity: Equal Weight (Specific), % IACS 120
190

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.0
Density, g/cm3 2.9
2.8
Embodied Carbon, kg CO2/kg material 8.3
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1140
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
3.1
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
110
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
50
Strength to Weight: Axial, points 44
15
Strength to Weight: Bending, points 45
22
Thermal Diffusivity, mm2/s 59
92
Thermal Shock Resistance, points 20
6.4

Alloy Composition


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Aluminum (Al), % 90.7 to 93.7
98.1 to 99.3
Chromium (Cr), % 0 to 0.050
0
Copper (Cu), % 0 to 0.25
0 to 0.050
Iron (Fe), % 0 to 0.4
0.7 to 1.3
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.1
0
Silicon (Si), % 0 to 0.25
0.050 to 0.3
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.0 to 6.0
0 to 0.1
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0 to 0.15
0 to 0.15