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2124 Aluminum vs. R31538 Cobalt

2124 aluminum belongs to the aluminum alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 27 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 2124 aluminum and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
220
Elongation at Break, % 5.7
13 to 23
Fatigue Strength, MPa 130
310 to 480
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
86
Tensile Strength: Ultimate (UTS), MPa 490
1020 to 1360
Tensile Strength: Yield (Proof), MPa 430
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 390
320
Melting Completion (Liquidus), °C 640
1360
Melting Onset (Solidus), °C 500
1290
Specific Heat Capacity, J/kg-K 880
450
Thermal Conductivity, W/m-K 150
13
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 110
2.1

Otherwise Unclassified Properties

Density, g/cm3 3.0
8.4
Embodied Carbon, kg CO2/kg material 8.2
8.1
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1150
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 1290
750 to 1920
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 45
34 to 45
Strength to Weight: Bending, points 46
27 to 32
Thermal Diffusivity, mm2/s 58
3.5
Thermal Shock Resistance, points 21
25 to 33

Alloy Composition

Aluminum (Al), % 91.3 to 94.7
0
Carbon (C), % 0
0.15 to 0.35
Chromium (Cr), % 0 to 0.1
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 3.8 to 4.9
0
Iron (Fe), % 0 to 0.3
0 to 0.75
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0.3 to 0.9
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0 to 0.2
0 to 1.0
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0