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EN AC-71100 Aluminum vs. G-CoCr28 Cobalt

EN AC-71100 aluminum belongs to the aluminum alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. There are 25 material properties with values for both materials. Properties with values for just one material (5, 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-71100 aluminum and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 72
210
Elongation at Break, % 1.1
6.7
Fatigue Strength, MPa 150
130
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
83
Tensile Strength: Ultimate (UTS), MPa 260
560
Tensile Strength: Yield (Proof), MPa 230
260

Thermal Properties

Latent Heat of Fusion, J/g 490
320
Maximum Temperature: Mechanical, °C 170
1200
Melting Completion (Liquidus), °C 580
1330
Melting Onset (Solidus), °C 520
1270
Specific Heat Capacity, J/kg-K 860
470
Thermal Expansion, µm/m-K 22
14

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
100
Density, g/cm3 2.9
8.1
Embodied Carbon, kg CO2/kg material 7.4
6.2
Embodied Energy, MJ/kg 140
84
Embodied Water, L/kg 1010
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.8
31
Resilience: Unit (Modulus of Resilience), kJ/m3 360
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 25
19
Strength to Weight: Bending, points 31
19
Thermal Shock Resistance, points 12
14

Alloy Composition

Aluminum (Al), % 78.7 to 83.3
0
Carbon (C), % 0
0.050 to 0.25
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0 to 0.3
9.7 to 24.5
Magnesium (Mg), % 0.2 to 0.5
0
Manganese (Mn), % 0 to 0.15
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), % 7.5 to 9.5
0.5 to 1.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 9.0 to 10.5
0
Residuals, % 0 to 0.15
0