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R30075 Cobalt vs. A357.0 Aluminum

R30075 cobalt belongs to the cobalt alloys classification, while A357.0 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 R30075 cobalt and the bottom bar is A357.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
70
Elongation at Break, % 12
3.7
Fatigue Strength, MPa 250 to 840
100
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 82 to 98
26
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
350
Tensile Strength: Yield (Proof), MPa 480 to 840
270

Thermal Properties

Latent Heat of Fusion, J/g 320
500
Melting Completion (Liquidus), °C 1360
610
Melting Onset (Solidus), °C 1290
560
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 13
160
Thermal Expansion, µm/m-K 12
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
40
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
140

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.6
Embodied Carbon, kg CO2/kg material 8.1
8.2
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 530
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
12
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
520
Stiffness to Weight: Axial, points 14 to 17
15
Stiffness to Weight: Bending, points 24 to 25
53
Strength to Weight: Axial, points 26 to 42
38
Strength to Weight: Bending, points 22 to 31
43
Thermal Diffusivity, mm2/s 3.5
68
Thermal Shock Resistance, points 21 to 29
17

Alloy Composition

Aluminum (Al), % 0 to 0.1
90.8 to 93
Beryllium (Be), % 0
0.040 to 0.070
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0
Chromium (Cr), % 27 to 30
0
Cobalt (Co), % 58.7 to 68
0
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 0 to 0.75
0 to 0.2
Magnesium (Mg), % 0
0.4 to 0.7
Manganese (Mn), % 0 to 1.0
0 to 0.1
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 0.5
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0
Silicon (Si), % 0 to 1.0
6.5 to 7.5
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0 to 0.1
0.040 to 0.2
Tungsten (W), % 0 to 0.2
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15