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238.0 Aluminum vs. R30816 Cobalt

238.0 aluminum belongs to the aluminum alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 25 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 238.0 aluminum and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 76
210
Elongation at Break, % 1.5
23
Fatigue Strength, MPa 110
250
Poisson's Ratio 0.33
0.3
Shear Modulus, GPa 28
81
Tensile Strength: Ultimate (UTS), MPa 210
1020
Tensile Strength: Yield (Proof), MPa 170
460

Thermal Properties

Latent Heat of Fusion, J/g 430
300
Melting Completion (Liquidus), °C 600
1540
Melting Onset (Solidus), °C 510
1460
Specific Heat Capacity, J/kg-K 840
420
Thermal Conductivity, W/m-K 100
13
Thermal Expansion, µm/m-K 21
12

Otherwise Unclassified Properties

Density, g/cm3 3.4
9.1
Embodied Carbon, kg CO2/kg material 7.4
20
Embodied Energy, MJ/kg 140
320
Embodied Water, L/kg 1040
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.9
190
Resilience: Unit (Modulus of Resilience), kJ/m3 180
510
Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 42
22
Strength to Weight: Axial, points 17
31
Strength to Weight: Bending, points 23
25
Thermal Diffusivity, mm2/s 37
3.3
Thermal Shock Resistance, points 9.1
28

Alloy Composition

Aluminum (Al), % 81.9 to 84.9
0
Carbon (C), % 0
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 9.5 to 10.5
0
Iron (Fe), % 1.0 to 1.5
0 to 5.0
Magnesium (Mg), % 0 to 0.25
0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 3.6 to 4.4
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Zinc (Zn), % 1.0 to 1.5
0