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4004 Aluminum vs. 8021 Aluminum

Both 4004 aluminum and 8021 aluminum are aluminum alloys. They have 89% 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 4004 aluminum and the bottom bar is 8021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
70
Elongation at Break, % 2.4
2.3
Fatigue Strength, MPa 42
61
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 27
26
Tensile Strength: Ultimate (UTS), MPa 110
160
Tensile Strength: Yield (Proof), MPa 60
130

Thermal Properties

Latent Heat of Fusion, J/g 540
400
Maximum Temperature: Mechanical, °C 160
170
Melting Completion (Liquidus), °C 600
650
Melting Onset (Solidus), °C 560
640
Specific Heat Capacity, J/kg-K 910
900
Thermal Conductivity, W/m-K 130
220
Thermal Expansion, µm/m-K 22
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
56
Electrical Conductivity: Equal Weight (Specific), % IACS 120
180

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.0
Density, g/cm3 2.6
2.8
Embodied Carbon, kg CO2/kg material 8.0
8.1
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1070
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 25
130
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 54
49
Strength to Weight: Axial, points 12
16
Strength to Weight: Bending, points 20
23
Thermal Diffusivity, mm2/s 58
88
Thermal Shock Resistance, points 5.1
7.0

Alloy Composition

Aluminum (Al), % 86 to 90
98 to 98.8
Copper (Cu), % 0 to 0.25
0 to 0.050
Iron (Fe), % 0 to 0.8
1.2 to 1.7
Magnesium (Mg), % 1.0 to 2.0
0
Manganese (Mn), % 0 to 0.1
0
Silicon (Si), % 9.0 to 10.5
0 to 0.15
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0 to 0.15