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EN AC-21100 Aluminum vs. R30155 Cobalt

EN AC-21100 aluminum belongs to the aluminum alloys classification, while R30155 cobalt belongs to the iron alloys. There are 28 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 EN AC-21100 aluminum and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 100 to 110
220
Elastic (Young's, Tensile) Modulus, GPa 71
210
Elongation at Break, % 6.2 to 7.3
34
Fatigue Strength, MPa 79 to 87
310
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
81
Tensile Strength: Ultimate (UTS), MPa 340 to 350
850
Tensile Strength: Yield (Proof), MPa 210 to 240
390

Thermal Properties

Latent Heat of Fusion, J/g 390
300
Maximum Temperature: Mechanical, °C 170
1100
Melting Completion (Liquidus), °C 670
1470
Melting Onset (Solidus), °C 550
1420
Specific Heat Capacity, J/kg-K 880
450
Thermal Conductivity, W/m-K 130
12
Thermal Expansion, µm/m-K 23
14

Otherwise Unclassified Properties

Base Metal Price, % relative 11
80
Density, g/cm3 3.0
8.5
Embodied Carbon, kg CO2/kg material 8.0
9.7
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1150
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 21
230
Resilience: Unit (Modulus of Resilience), kJ/m3 300 to 400
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
23
Strength to Weight: Axial, points 31 to 33
28
Strength to Weight: Bending, points 36 to 37
24
Thermal Diffusivity, mm2/s 48
3.2
Thermal Shock Resistance, points 15
21

Alloy Composition

Aluminum (Al), % 93.4 to 95.7
0
Carbon (C), % 0
0.080 to 0.16
Chromium (Cr), % 0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 4.2 to 5.2
0
Iron (Fe), % 0 to 0.19
24.3 to 36.2
Manganese (Mn), % 0 to 0.55
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 0.18
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Titanium (Ti), % 0.15 to 0.3
0
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 0 to 0.070
0
Residuals, % 0 to 0.1
0