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EN AC-21100 Aluminum vs. G-CoCr28 Cobalt

EN AC-21100 aluminum belongs to the aluminum alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (3, 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 G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
210
Elongation at Break, % 6.2 to 7.3
6.7
Fatigue Strength, MPa 79 to 87
130
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
83
Tensile Strength: Ultimate (UTS), MPa 340 to 350
560
Tensile Strength: Yield (Proof), MPa 210 to 240
260

Thermal Properties

Latent Heat of Fusion, J/g 390
320
Maximum Temperature: Mechanical, °C 170
1200
Melting Completion (Liquidus), °C 670
1330
Melting Onset (Solidus), °C 550
1270
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 130
8.5
Thermal Expansion, µm/m-K 23
14

Otherwise Unclassified Properties

Base Metal Price, % relative 11
100
Density, g/cm3 3.0
8.1
Embodied Carbon, kg CO2/kg material 8.0
6.2
Embodied Energy, MJ/kg 150
84
Embodied Water, L/kg 1150
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 21
31
Resilience: Unit (Modulus of Resilience), kJ/m3 300 to 400
160
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 31 to 33
19
Strength to Weight: Bending, points 36 to 37
19
Thermal Diffusivity, mm2/s 48
2.2
Thermal Shock Resistance, points 15
14

Alloy Composition


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Aluminum (Al), % 93.4 to 95.7
0
Carbon (C), % 0
0.050 to 0.25
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 4.2 to 5.2
0
Iron (Fe), % 0 to 0.19
9.7 to 24.5
Manganese (Mn), % 0 to 0.55
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.18
0.5 to 1.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0.15 to 0.3
0
Zinc (Zn), % 0 to 0.070
0
Residuals, % 0 to 0.1
0