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7021 Aluminum vs. 5449 Aluminum

Both 7021 aluminum and 5449 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 5449 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
69
Elongation at Break, % 9.4
4.0 to 17
Fatigue Strength, MPa 150
78 to 120
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
26
Shear Strength, MPa 270
130 to 190
Tensile Strength: Ultimate (UTS), MPa 460
210 to 330
Tensile Strength: Yield (Proof), MPa 390
91 to 260

Thermal Properties

Latent Heat of Fusion, J/g 380
400
Maximum Temperature: Mechanical, °C 200
190
Melting Completion (Liquidus), °C 630
650
Melting Onset (Solidus), °C 510
590
Specific Heat Capacity, J/kg-K 870
900
Thermal Conductivity, W/m-K 150
140
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
35
Electrical Conductivity: Equal Weight (Specific), % IACS 120
110

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.9
2.8
Embodied Carbon, kg CO2/kg material 8.3
8.5
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1140
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
12 to 29
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
60 to 480
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
50
Strength to Weight: Axial, points 44
22 to 33
Strength to Weight: Bending, points 45
29 to 39
Thermal Diffusivity, mm2/s 59
56
Thermal Shock Resistance, points 20
9.4 to 15

Alloy Composition


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Aluminum (Al), % 90.7 to 93.7
94.1 to 97.8
Chromium (Cr), % 0 to 0.050
0 to 0.3
Copper (Cu), % 0 to 0.25
0 to 0.3
Iron (Fe), % 0 to 0.4
0 to 0.7
Magnesium (Mg), % 1.2 to 1.8
1.6 to 2.6
Manganese (Mn), % 0 to 0.1
0.6 to 1.1
Silicon (Si), % 0 to 0.25
0 to 0.4
Titanium (Ti), % 0 to 0.1
0 to 0.1
Zinc (Zn), % 5.0 to 6.0
0 to 0.3
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0 to 0.15
0 to 0.15