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5657 Aluminum vs. 7021 Aluminum

Both 5657 aluminum and 7021 aluminum are aluminum alloys. They have a moderately high 93% of their average alloy composition in common. There are 30 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 5657 aluminum and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
69
Elongation at Break, % 6.6 to 15
9.4
Fatigue Strength, MPa 74 to 88
150
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
26
Shear Strength, MPa 92 to 110
270
Tensile Strength: Ultimate (UTS), MPa 150 to 200
460
Tensile Strength: Yield (Proof), MPa 140 to 170
390

Thermal Properties

Latent Heat of Fusion, J/g 400
380
Maximum Temperature: Mechanical, °C 180
200
Melting Completion (Liquidus), °C 660
630
Melting Onset (Solidus), °C 640
510
Specific Heat Capacity, J/kg-K 900
870
Thermal Conductivity, W/m-K 210
150
Thermal Expansion, µm/m-K 24
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 54
38
Electrical Conductivity: Equal Weight (Specific), % IACS 180
120

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.7
2.9
Embodied Carbon, kg CO2/kg material 8.4
8.3
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 1200
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 9.7 to 27
41
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 200
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
47
Strength to Weight: Axial, points 15 to 20
44
Strength to Weight: Bending, points 23 to 28
45
Thermal Diffusivity, mm2/s 84
59
Thermal Shock Resistance, points 6.7 to 8.6
20

Alloy Composition

Aluminum (Al), % 98.5 to 99.4
90.7 to 93.7
Chromium (Cr), % 0
0 to 0.050
Copper (Cu), % 0 to 0.1
0 to 0.25
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.1
0 to 0.4
Magnesium (Mg), % 0.6 to 1.0
1.2 to 1.8
Manganese (Mn), % 0 to 0.030
0 to 0.1
Silicon (Si), % 0 to 0.080
0 to 0.25
Titanium (Ti), % 0
0 to 0.1
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 0 to 0.050
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0 to 0.050
0 to 0.15