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R31537 Cobalt vs. 7475 Aluminum

R31537 cobalt belongs to the cobalt alloys classification, while 7475 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 R31537 cobalt and the bottom bar is 7475 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
70
Elongation at Break, % 14 to 23
10 to 12
Fatigue Strength, MPa 310 to 480
190 to 210
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 87
26
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
530 to 590
Tensile Strength: Yield (Proof), MPa 590 to 940
440 to 520

Thermal Properties

Latent Heat of Fusion, J/g 320
380
Melting Completion (Liquidus), °C 1360
640
Melting Onset (Solidus), °C 1290
480
Specific Heat Capacity, J/kg-K 450
870
Thermal Conductivity, W/m-K 13
140 to 160
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
33 to 42
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
98 to 120

Otherwise Unclassified Properties

Density, g/cm3 8.4
3.0
Embodied Carbon, kg CO2/kg material 8.1
8.2
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 530
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
53 to 68
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 1990
1390 to 1920
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 33 to 44
49 to 55
Strength to Weight: Bending, points 26 to 32
48 to 52
Thermal Diffusivity, mm2/s 3.4
53 to 63
Thermal Shock Resistance, points 24 to 32
23 to 26

Alloy Composition

Aluminum (Al), % 0
88.6 to 91.6
Carbon (C), % 0 to 0.14
0
Chromium (Cr), % 26 to 30
0.18 to 0.25
Cobalt (Co), % 58.9 to 69
0
Copper (Cu), % 0
1.2 to 1.9
Iron (Fe), % 0 to 0.75
0 to 0.12
Magnesium (Mg), % 0
1.9 to 2.6
Manganese (Mn), % 0 to 1.0
0 to 0.060
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 0.1
Titanium (Ti), % 0
0 to 0.060
Zinc (Zn), % 0
5.1 to 6.2
Residuals, % 0
0 to 0.15