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7021 Aluminum vs. R30003 Cobalt

7021 aluminum belongs to the aluminum alloys classification, while R30003 cobalt belongs to the cobalt alloys. There are 27 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 R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
210
Elongation at Break, % 9.4
10 to 73
Fatigue Strength, MPa 150
320 to 560
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
83
Tensile Strength: Ultimate (UTS), MPa 460
970 to 1720
Tensile Strength: Yield (Proof), MPa 390
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 380
310
Melting Completion (Liquidus), °C 630
1400
Melting Onset (Solidus), °C 510
1440
Specific Heat Capacity, J/kg-K 870
450
Thermal Conductivity, W/m-K 150
13
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
95
Density, g/cm3 2.9
8.4
Embodied Carbon, kg CO2/kg material 8.3
8.0
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1140
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 1110
600 to 2790
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 44
32 to 57
Strength to Weight: Bending, points 45
26 to 38
Thermal Diffusivity, mm2/s 59
3.3
Thermal Shock Resistance, points 20
26 to 45

Alloy Composition


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Aluminum (Al), % 90.7 to 93.7
0
Boron (B), % 0
0 to 0.1
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0 to 0.050
19 to 21
Cobalt (Co), % 0
39 to 41
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.4
10 to 20.5
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.1
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 0
14 to 16
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.25
0 to 1.2
Sulfur (S), % 0
0 to 0.015
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 to 0.15
0