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8021 Aluminum vs. 6351 Aluminum

Both 8021 aluminum and 6351 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 (1, in this case) are not shown.

For each property being compared, the top bar is 8021 aluminum and the bottom bar is 6351 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
69
Elongation at Break, % 2.3
7.8 to 18
Fatigue Strength, MPa 61
79 to 130
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
26
Tensile Strength: Ultimate (UTS), MPa 160
140 to 310
Tensile Strength: Yield (Proof), MPa 130
95 to 270

Thermal Properties

Latent Heat of Fusion, J/g 400
410
Maximum Temperature: Mechanical, °C 170
160
Melting Completion (Liquidus), °C 650
650
Melting Onset (Solidus), °C 640
570
Specific Heat Capacity, J/kg-K 900
900
Thermal Conductivity, W/m-K 220
180
Thermal Expansion, µm/m-K 23
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
46
Electrical Conductivity: Equal Weight (Specific), % IACS 180
150

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.4
20 to 38
Resilience: Unit (Modulus of Resilience), kJ/m3 130
65 to 540
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 49
50
Strength to Weight: Axial, points 16
14 to 32
Strength to Weight: Bending, points 23
22 to 38
Thermal Diffusivity, mm2/s 88
72
Thermal Shock Resistance, points 7.0
6.1 to 14

Alloy Composition

Aluminum (Al), % 98 to 98.8
96 to 98.5
Copper (Cu), % 0 to 0.050
0 to 0.1
Iron (Fe), % 1.2 to 1.7
0 to 0.5
Magnesium (Mg), % 0
0.4 to 0.8
Manganese (Mn), % 0
0.4 to 0.8
Silicon (Si), % 0 to 0.15
0.7 to 1.3
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15