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7021 Aluminum vs. 5088 Aluminum

Both 7021 aluminum and 5088 aluminum are aluminum alloys. They have a moderately high 95% of their average alloy composition in common.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is 5088 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
68
Elongation at Break, % 9.4
29
Fatigue Strength, MPa 150
180
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
25
Shear Strength, MPa 270
200
Tensile Strength: Ultimate (UTS), MPa 460
310
Tensile Strength: Yield (Proof), MPa 390
150

Thermal Properties

Latent Heat of Fusion, J/g 380
390
Maximum Temperature: Mechanical, °C 200
200
Melting Completion (Liquidus), °C 630
640
Melting Onset (Solidus), °C 510
540
Specific Heat Capacity, J/kg-K 870
900
Thermal Conductivity, W/m-K 150
120
Thermal Expansion, µm/m-K 24
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
29
Electrical Conductivity: Equal Weight (Specific), % IACS 120
98

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.9
2.7
Embodied Carbon, kg CO2/kg material 8.3
9.0
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1140
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
76
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
170
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
50
Strength to Weight: Axial, points 44
32
Strength to Weight: Bending, points 45
38
Thermal Diffusivity, mm2/s 59
51
Thermal Shock Resistance, points 20
14

Alloy Composition


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Aluminum (Al), % 90.7 to 93.7
92.4 to 94.8
Chromium (Cr), % 0 to 0.050
0 to 0.15
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 0 to 0.4
0.1 to 0.35
Magnesium (Mg), % 1.2 to 1.8
4.7 to 5.5
Manganese (Mn), % 0 to 0.1
0.2 to 0.5
Silicon (Si), % 0 to 0.25
0 to 0.2
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.0 to 6.0
0.2 to 0.4
Zirconium (Zr), % 0.080 to 0.18
0 to 0.15
Residuals, % 0 to 0.15
0 to 0.15