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238.0 Aluminum vs. 8021 Aluminum

Both 238.0 aluminum and 8021 aluminum are aluminum alloys. They have 85% of their average alloy composition in common.

For each property being compared, the top bar is 238.0 aluminum and the bottom bar is 8021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 76
70
Elongation at Break, % 1.5
2.3
Fatigue Strength, MPa 110
61
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 28
26
Tensile Strength: Ultimate (UTS), MPa 210
160
Tensile Strength: Yield (Proof), MPa 170
130

Thermal Properties

Latent Heat of Fusion, J/g 430
400
Maximum Temperature: Mechanical, °C 170
170
Melting Completion (Liquidus), °C 600
650
Melting Onset (Solidus), °C 510
640
Specific Heat Capacity, J/kg-K 840
900
Thermal Conductivity, W/m-K 100
220
Thermal Expansion, µm/m-K 21
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
56
Electrical Conductivity: Equal Weight (Specific), % IACS 67
180

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.0
Density, g/cm3 3.4
2.8
Embodied Carbon, kg CO2/kg material 7.4
8.1
Embodied Energy, MJ/kg 140
150
Embodied Water, L/kg 1040
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.9
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 180
130
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 42
49
Strength to Weight: Axial, points 17
16
Strength to Weight: Bending, points 23
23
Thermal Diffusivity, mm2/s 37
88
Thermal Shock Resistance, points 9.1
7.0

Alloy Composition

Aluminum (Al), % 81.9 to 84.9
98 to 98.8
Copper (Cu), % 9.5 to 10.5
0 to 0.050
Iron (Fe), % 1.0 to 1.5
1.2 to 1.7
Magnesium (Mg), % 0 to 0.25
0
Silicon (Si), % 3.6 to 4.4
0 to 0.15
Zinc (Zn), % 1.0 to 1.5
0
Residuals, % 0
0 to 0.15