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7075 Aluminum vs. R31537 Cobalt

7075 aluminum belongs to the aluminum alloys classification, while R31537 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, 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 7075 aluminum and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
220
Elongation at Break, % 1.8 to 12
14 to 23
Fatigue Strength, MPa 110 to 190
310 to 480
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
87
Tensile Strength: Ultimate (UTS), MPa 240 to 590
1000 to 1340
Tensile Strength: Yield (Proof), MPa 120 to 510
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 380
320
Melting Completion (Liquidus), °C 640
1360
Melting Onset (Solidus), °C 480
1290
Specific Heat Capacity, J/kg-K 870
450
Thermal Conductivity, W/m-K 130
13
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 98
2.1

Otherwise Unclassified Properties

Density, g/cm3 3.0
8.4
Embodied Carbon, kg CO2/kg material 8.3
8.1
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1120
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8 to 44
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 1870
780 to 1990
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 22 to 54
33 to 44
Strength to Weight: Bending, points 28 to 52
26 to 32
Thermal Diffusivity, mm2/s 50
3.4
Thermal Shock Resistance, points 10 to 25
24 to 32

Alloy Composition

Aluminum (Al), % 86.9 to 91.4
0
Carbon (C), % 0
0 to 0.14
Chromium (Cr), % 0.18 to 0.28
26 to 30
Cobalt (Co), % 0
58.9 to 69
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 0 to 0.5
0 to 0.75
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.3
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0 to 0.4
0 to 1.0
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 5.1 to 6.1
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0

Comparable Variants