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7021 Aluminum vs. C99300 Copper

7021 aluminum belongs to the aluminum alloys classification, while C99300 copper belongs to the copper alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is C99300 copper.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
120
Elongation at Break, % 9.4
2.0
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
46
Tensile Strength: Ultimate (UTS), MPa 460
660
Tensile Strength: Yield (Proof), MPa 390
380

Thermal Properties

Latent Heat of Fusion, J/g 380
240
Maximum Temperature: Mechanical, °C 200
250
Melting Completion (Liquidus), °C 630
1080
Melting Onset (Solidus), °C 510
1070
Specific Heat Capacity, J/kg-K 870
450
Thermal Conductivity, W/m-K 150
43
Thermal Expansion, µm/m-K 24
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
9.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
35
Density, g/cm3 2.9
8.2
Embodied Carbon, kg CO2/kg material 8.3
4.5
Embodied Energy, MJ/kg 150
70
Embodied Water, L/kg 1140
400

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
11
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
590
Stiffness to Weight: Axial, points 13
8.3
Stiffness to Weight: Bending, points 47
20
Strength to Weight: Axial, points 44
22
Strength to Weight: Bending, points 45
20
Thermal Diffusivity, mm2/s 59
12
Thermal Shock Resistance, points 20
22

Alloy Composition

Aluminum (Al), % 90.7 to 93.7
10.7 to 11.5
Chromium (Cr), % 0 to 0.050
0
Cobalt (Co), % 0
1.0 to 2.0
Copper (Cu), % 0 to 0.25
68.6 to 74.4
Iron (Fe), % 0 to 0.4
0.4 to 1.0
Lead (Pb), % 0
0 to 0.020
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.1
0
Nickel (Ni), % 0
13.5 to 16.5
Silicon (Si), % 0 to 0.25
0 to 0.020
Tin (Sn), % 0
0 to 0.050
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.0 to 6.0
0
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0
0 to 0.3