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7129 Aluminum vs. EN 2.4964 Cobalt

7129 Aluminum belongs to the aluminum alloys classification, while EN 2.4964 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 7129 Aluminum and the bottom bar is EN 2.4964 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
220
Elongation at Break, % 9.0 to 9.1
40
Fatigue Strength, MPa 150 to 190
220
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
86
Tensile Strength: Ultimate (UTS), MPa 430
960
Tensile Strength: Yield (Proof), MPa 380 to 390
390

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Melting Completion (Liquidus), °C 630
1630
Melting Onset (Solidus), °C 510
1550
Specific Heat Capacity, J/kg-K 880
400
Thermal Conductivity, W/m-K 150
15
Thermal Expansion, µm/m-K 24
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 120
1.8

Otherwise Unclassified Properties

Density, g/cm3 2.9
9.6
Embodied Carbon, kg CO2/kg material 8.3
9.8
Embodied Energy, MJ/kg 150
140
Embodied Water, L/kg 1150
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
310
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
340
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
21
Strength to Weight: Axial, points 41
28
Strength to Weight: Bending, points 43 to 44
23
Thermal Diffusivity, mm2/s 58
3.9
Thermal Shock Resistance, points 19
25

Alloy Composition

Aluminum (Al), % 91 to 94
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0 to 0.1
19 to 21
Cobalt (Co), % 0
46.4 to 58
Copper (Cu), % 0.5 to 0.9
0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
0 to 3.0
Magnesium (Mg), % 1.3 to 2.0
0
Manganese (Mn), % 0 to 0.1
0 to 2.0
Nickel (Ni), % 0
9.0 to 11
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.15
0 to 0.4
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.050
0
Tungsten (W), % 0
14 to 16
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 4.2 to 5.2
0
Residuals, % 0 to 0.15
0