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R30021 Cobalt vs. A357.0 Aluminum

R30021 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 (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 R30021 cobalt and the bottom bar is A357.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
70
Elongation at Break, % 9.0
3.7
Fatigue Strength, MPa 250
100
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 700
350
Tensile Strength: Yield (Proof), MPa 500
270

Thermal Properties

Latent Heat of Fusion, J/g 330
500
Melting Completion (Liquidus), °C 1350
610
Melting Onset (Solidus), °C 1190
560
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 15
160
Thermal Expansion, µm/m-K 11
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
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 8.0
8.2
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 520
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
12
Resilience: Unit (Modulus of Resilience), kJ/m3 570
520
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
53
Strength to Weight: Axial, points 23
38
Strength to Weight: Bending, points 21
43
Thermal Diffusivity, mm2/s 3.8
68
Thermal Shock Resistance, points 21
17

Alloy Composition


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Aluminum (Al), % 0
90.8 to 93
Beryllium (Be), % 0
0.040 to 0.070
Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 0 to 3.0
0 to 0.2
Magnesium (Mg), % 0
0.4 to 0.7
Manganese (Mn), % 0
0 to 0.1
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Silicon (Si), % 0 to 1.5
6.5 to 7.5
Titanium (Ti), % 0
0.040 to 0.2
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15