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R30021 Cobalt vs. 7129 Aluminum

R30021 cobalt belongs to the cobalt alloys classification, while 7129 Aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, 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 R30021 cobalt and the bottom bar is 7129 Aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
69
Elongation at Break, % 9.0
9.0 to 9.1
Fatigue Strength, MPa 250
150 to 190
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 700
430
Tensile Strength: Yield (Proof), MPa 500
380 to 390

Thermal Properties

Latent Heat of Fusion, J/g 330
380
Melting Completion (Liquidus), °C 1350
630
Melting Onset (Solidus), °C 1190
510
Specific Heat Capacity, J/kg-K 450
880
Thermal Conductivity, W/m-K 15
150
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
40
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
120

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.9
Embodied Carbon, kg CO2/kg material 8.0
8.3
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 520
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
37 to 38
Resilience: Unit (Modulus of Resilience), kJ/m3 570
1050 to 1090
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 23
41
Strength to Weight: Bending, points 21
43 to 44
Thermal Diffusivity, mm2/s 3.8
58
Thermal Shock Resistance, points 21
19

Alloy Composition


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Aluminum (Al), % 0
91 to 94
Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0 to 0.1
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0.5 to 0.9
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 0 to 3.0
0 to 0.3
Magnesium (Mg), % 0
1.3 to 2.0
Manganese (Mn), % 0
0 to 0.1
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Silicon (Si), % 0 to 1.5
0 to 0.15
Titanium (Ti), % 0
0 to 0.050
Vanadium (V), % 0
0 to 0.050
Zinc (Zn), % 0
4.2 to 5.2
Residuals, % 0
0 to 0.15