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R31538 Cobalt vs. 7129 Aluminum

R31538 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 R31538 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, % 13 to 23
9.0 to 9.1
Fatigue Strength, MPa 310 to 480
150 to 190
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
430
Tensile Strength: Yield (Proof), MPa 580 to 930
380 to 390

Thermal Properties

Latent Heat of Fusion, J/g 320
380
Melting Completion (Liquidus), °C 1360
630
Melting Onset (Solidus), °C 1290
510
Specific Heat Capacity, J/kg-K 450
880
Thermal Conductivity, W/m-K 13
150
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
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 8.1
8.3
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 530
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
37 to 38
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
1050 to 1090
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 34 to 45
41
Strength to Weight: Bending, points 27 to 32
43 to 44
Thermal Diffusivity, mm2/s 3.5
58
Thermal Shock Resistance, points 25 to 33
19

Alloy Composition


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Aluminum (Al), % 0
91 to 94
Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0 to 0.1
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0.5 to 0.9
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 0 to 0.75
0 to 0.3
Magnesium (Mg), % 0
1.3 to 2.0
Manganese (Mn), % 0 to 1.0
0 to 0.1
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
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