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3105 Aluminum vs. R30155 Cobalt

3105 aluminum belongs to the aluminum alloys classification, while R30155 cobalt belongs to the iron alloys. There are 29 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 3105 aluminum and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 29 to 67
220
Elastic (Young's, Tensile) Modulus, GPa 69
210
Elongation at Break, % 1.1 to 20
34
Fatigue Strength, MPa 39 to 95
310
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
81
Shear Strength, MPa 77 to 140
570
Tensile Strength: Ultimate (UTS), MPa 120 to 240
850
Tensile Strength: Yield (Proof), MPa 46 to 220
390

Thermal Properties

Latent Heat of Fusion, J/g 400
300
Maximum Temperature: Mechanical, °C 180
1100
Melting Completion (Liquidus), °C 660
1470
Melting Onset (Solidus), °C 640
1420
Specific Heat Capacity, J/kg-K 900
450
Thermal Conductivity, W/m-K 170
12
Thermal Expansion, µm/m-K 24
14

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
80
Density, g/cm3 2.8
8.5
Embodied Carbon, kg CO2/kg material 8.2
9.7
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.6 to 19
230
Resilience: Unit (Modulus of Resilience), kJ/m3 15 to 340
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
23
Strength to Weight: Axial, points 12 to 24
28
Strength to Weight: Bending, points 20 to 31
24
Thermal Diffusivity, mm2/s 68
3.2
Thermal Shock Resistance, points 5.2 to 11
21

Alloy Composition

Aluminum (Al), % 96 to 99.5
0
Carbon (C), % 0
0.080 to 0.16
Chromium (Cr), % 0 to 0.2
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 0 to 0.7
24.3 to 36.2
Magnesium (Mg), % 0.2 to 0.8
0
Manganese (Mn), % 0.3 to 0.8
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.6
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 0 to 0.4
0
Residuals, % 0 to 0.15
0