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R30816 Cobalt vs. 7475 Aluminum

R30816 cobalt belongs to the cobalt alloys classification, while 7475 aluminum belongs to the aluminum alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 R30816 cobalt and the bottom bar is 7475 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
70
Elongation at Break, % 23
10 to 12
Fatigue Strength, MPa 250
190 to 210
Poisson's Ratio 0.3
0.32
Shear Modulus, GPa 81
26
Tensile Strength: Ultimate (UTS), MPa 1020
530 to 590
Tensile Strength: Yield (Proof), MPa 460
440 to 520

Thermal Properties

Latent Heat of Fusion, J/g 300
380
Melting Completion (Liquidus), °C 1540
640
Melting Onset (Solidus), °C 1460
480
Specific Heat Capacity, J/kg-K 420
870
Thermal Conductivity, W/m-K 13
140 to 160
Thermal Expansion, µm/m-K 12
23

Otherwise Unclassified Properties

Density, g/cm3 9.1
3.0
Embodied Carbon, kg CO2/kg material 20
8.2
Embodied Energy, MJ/kg 320
150
Embodied Water, L/kg 440
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
53 to 68
Resilience: Unit (Modulus of Resilience), kJ/m3 510
1390 to 1920
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
46
Strength to Weight: Axial, points 31
49 to 55
Strength to Weight: Bending, points 25
48 to 52
Thermal Diffusivity, mm2/s 3.3
53 to 63
Thermal Shock Resistance, points 28
23 to 26

Alloy Composition

Aluminum (Al), % 0
88.6 to 91.6
Carbon (C), % 0.32 to 0.42
0
Chromium (Cr), % 19 to 21
0.18 to 0.25
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
1.2 to 1.9
Iron (Fe), % 0 to 5.0
0 to 0.12
Magnesium (Mg), % 0
1.9 to 2.6
Manganese (Mn), % 1.0 to 2.0
0 to 0.060
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 3.5 to 4.5
0
Titanium (Ti), % 0
0 to 0.060
Tungsten (W), % 3.5 to 4.5
0
Zinc (Zn), % 0
5.1 to 6.2
Residuals, % 0
0 to 0.15