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7021 Aluminum vs. 8021 Aluminum

Both 7021 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 (1, in this case) are not shown.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is 8021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
70
Elongation at Break, % 9.4
2.3
Fatigue Strength, MPa 150
61
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
26
Tensile Strength: Ultimate (UTS), MPa 460
160
Tensile Strength: Yield (Proof), MPa 390
130

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
220
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
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 1140
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
130
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
49
Strength to Weight: Axial, points 44
16
Strength to Weight: Bending, points 45
23
Thermal Diffusivity, mm2/s 59
88
Thermal Shock Resistance, points 20
7.0

Alloy Composition

Aluminum (Al), % 90.7 to 93.7
98 to 98.8
Chromium (Cr), % 0 to 0.050
0
Copper (Cu), % 0 to 0.25
0 to 0.050
Iron (Fe), % 0 to 0.4
1.2 to 1.7
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.1
0
Silicon (Si), % 0 to 0.25
0 to 0.15
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.0 to 6.0
0
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0
0 to 0.15