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6061 Aluminum vs. 8021 Aluminum

Both 6061 aluminum and 8021 aluminum are aluminum alloys. They have a very high 98% 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 6061 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, % 3.4 to 20
2.3
Fatigue Strength, MPa 58 to 110
61
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
26
Tensile Strength: Ultimate (UTS), MPa 130 to 410
160
Tensile Strength: Yield (Proof), MPa 76 to 370
130

Thermal Properties

Latent Heat of Fusion, J/g 400
400
Maximum Temperature: Mechanical, °C 170
170
Melting Completion (Liquidus), °C 650
650
Melting Onset (Solidus), °C 580
640
Specific Heat Capacity, J/kg-K 900
900
Thermal Conductivity, W/m-K 170
220
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 43
56
Electrical Conductivity: Equal Weight (Specific), % IACS 140
180

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.0
Density, g/cm3 2.7
2.8
Embodied Carbon, kg CO2/kg material 8.3
8.1
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.8 to 81
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 42 to 1000
130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
49
Strength to Weight: Axial, points 13 to 42
16
Strength to Weight: Bending, points 21 to 45
23
Thermal Diffusivity, mm2/s 68
88
Thermal Shock Resistance, points 5.7 to 18
7.0

Alloy Composition

Aluminum (Al), % 95.9 to 98.6
98 to 98.8
Chromium (Cr), % 0.040 to 0.35
0
Copper (Cu), % 0.15 to 0.4
0 to 0.050
Iron (Fe), % 0 to 0.7
1.2 to 1.7
Magnesium (Mg), % 0.8 to 1.2
0
Manganese (Mn), % 0 to 0.15
0
Silicon (Si), % 0.4 to 0.8
0 to 0.15
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0
0 to 0.15