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7020 Aluminum vs. 8021 Aluminum

Both 7020 aluminum and 8021 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 (2, in this case) are not shown.

For each property being compared, the top bar is 7020 aluminum and the bottom bar is 8021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
70
Elongation at Break, % 8.4 to 14
2.3
Fatigue Strength, MPa 110 to 130
61
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
26
Tensile Strength: Ultimate (UTS), MPa 190 to 390
160
Tensile Strength: Yield (Proof), MPa 120 to 310
130

Thermal Properties

Latent Heat of Fusion, J/g 380
400
Maximum Temperature: Mechanical, °C 210
170
Melting Completion (Liquidus), °C 650
650
Melting Onset (Solidus), °C 610
640
Specific Heat Capacity, J/kg-K 880
900
Thermal Conductivity, W/m-K 150
220
Thermal Expansion, µm/m-K 23
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
56
Electrical Conductivity: Equal Weight (Specific), % IACS 120
180

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
8.1
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1150
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 46
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 690
130
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
49
Strength to Weight: Axial, points 18 to 37
16
Strength to Weight: Bending, points 25 to 41
23
Thermal Diffusivity, mm2/s 59
88
Thermal Shock Resistance, points 8.3 to 17
7.0

Alloy Composition

Aluminum (Al), % 91.2 to 94.8
98 to 98.8
Chromium (Cr), % 0.1 to 0.35
0
Copper (Cu), % 0 to 0.2
0 to 0.050
Iron (Fe), % 0 to 0.4
1.2 to 1.7
Magnesium (Mg), % 1.0 to 1.4
0
Manganese (Mn), % 0.050 to 0.5
0
Silicon (Si), % 0 to 0.35
0 to 0.15
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 4.0 to 5.0
0
Zirconium (Zr), % 0.080 to 0.25
0
Residuals, % 0
0 to 0.15