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R31538 Cobalt vs. 7050 Aluminum

R31538 cobalt belongs to the cobalt alloys classification, while 7050 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 7050 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
70
Elongation at Break, % 13 to 23
2.2 to 12
Fatigue Strength, MPa 310 to 480
130 to 210
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
490 to 570
Tensile Strength: Yield (Proof), MPa 580 to 930
390 to 500

Thermal Properties

Latent Heat of Fusion, J/g 320
370
Melting Completion (Liquidus), °C 1360
630
Melting Onset (Solidus), °C 1290
490
Specific Heat Capacity, J/kg-K 450
860
Thermal Conductivity, W/m-K 13
140
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
35
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
100

Otherwise Unclassified Properties

Density, g/cm3 8.4
3.1
Embodied Carbon, kg CO2/kg material 8.1
8.2
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 530
1120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
10 to 55
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
1110 to 1760
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 34 to 45
45 to 51
Strength to Weight: Bending, points 27 to 32
45 to 50
Thermal Diffusivity, mm2/s 3.5
54
Thermal Shock Resistance, points 25 to 33
21 to 25

Alloy Composition


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Aluminum (Al), % 0
87.3 to 92.1
Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0 to 0.040
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
2.0 to 2.6
Iron (Fe), % 0 to 0.75
0 to 0.15
Magnesium (Mg), % 0
1.9 to 2.6
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 0.12
Titanium (Ti), % 0
0 to 0.060
Zinc (Zn), % 0
5.7 to 6.7
Zirconium (Zr), % 0
0.080 to 0.15
Residuals, % 0
0 to 0.15