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7021 Aluminum vs. 4047 Aluminum

Both 7021 aluminum and 4047 aluminum are aluminum alloys. They have 88% 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 7021 aluminum and the bottom bar is 4047 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
72
Elongation at Break, % 9.4
3.4
Fatigue Strength, MPa 150
45
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
27
Shear Strength, MPa 270
69
Tensile Strength: Ultimate (UTS), MPa 460
120
Tensile Strength: Yield (Proof), MPa 390
64

Thermal Properties

Latent Heat of Fusion, J/g 380
570
Maximum Temperature: Mechanical, °C 200
160
Melting Completion (Liquidus), °C 630
580
Melting Onset (Solidus), °C 510
580
Specific Heat Capacity, J/kg-K 870
900
Thermal Conductivity, W/m-K 150
130
Thermal Expansion, µm/m-K 24
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
33
Electrical Conductivity: Equal Weight (Specific), % IACS 120
120

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.9
2.5
Embodied Carbon, kg CO2/kg material 8.3
7.7
Embodied Energy, MJ/kg 150
140
Embodied Water, L/kg 1140
1050

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
3.5
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
28
Stiffness to Weight: Axial, points 13
16
Stiffness to Weight: Bending, points 47
55
Strength to Weight: Axial, points 44
13
Strength to Weight: Bending, points 45
21
Thermal Diffusivity, mm2/s 59
59
Thermal Shock Resistance, points 20
5.6

Alloy Composition


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Aluminum (Al), % 90.7 to 93.7
85.3 to 89
Chromium (Cr), % 0 to 0.050
0
Copper (Cu), % 0 to 0.25
0 to 0.3
Iron (Fe), % 0 to 0.4
0 to 0.8
Magnesium (Mg), % 1.2 to 1.8
0 to 0.1
Manganese (Mn), % 0 to 0.1
0 to 0.15
Silicon (Si), % 0 to 0.25
11 to 13
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.0 to 6.0
0 to 0.2
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0 to 0.15
0 to 0.15