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R30006 Cobalt vs. 7005 Aluminum

R30006 cobalt belongs to the cobalt alloys classification, while 7005 aluminum belongs to the aluminum alloys. There are 28 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 R30006 cobalt and the bottom bar is 7005 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
70
Elongation at Break, % 1.0
10 to 20
Fatigue Strength, MPa 260
100 to 190
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 85
26
Tensile Strength: Ultimate (UTS), MPa 900
200 to 400
Tensile Strength: Yield (Proof), MPa 540
95 to 350

Thermal Properties

Latent Heat of Fusion, J/g 320
380
Melting Completion (Liquidus), °C 1400
640
Melting Onset (Solidus), °C 1290
610
Specific Heat Capacity, J/kg-K 450
880
Thermal Conductivity, W/m-K 15
140 to 170
Thermal Expansion, µm/m-K 11
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
35 to 43
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
110 to 130

Otherwise Unclassified Properties

Calomel Potential, mV -250
-850
Density, g/cm3 8.6
2.9
Embodied Carbon, kg CO2/kg material 7.8
8.3
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 500
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
32 to 57
Resilience: Unit (Modulus of Resilience), kJ/m3 670
65 to 850
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
47
Strength to Weight: Axial, points 29
19 to 38
Strength to Weight: Bending, points 24
26 to 41
Thermal Diffusivity, mm2/s 3.9
54 to 65
Thermal Shock Resistance, points 26
8.7 to 18

Alloy Composition

Aluminum (Al), % 0
91 to 94.7
Carbon (C), % 0.9 to 1.4
0
Chromium (Cr), % 27 to 32
0.060 to 0.2
Cobalt (Co), % 48.6 to 68.1
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 0 to 3.0
0 to 0.4
Magnesium (Mg), % 0
1.0 to 1.8
Manganese (Mn), % 0
0.2 to 0.7
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
0
Silicon (Si), % 0 to 2.0
0 to 0.35
Titanium (Ti), % 0
0.010 to 0.060
Tungsten (W), % 4.0 to 6.0
0
Zinc (Zn), % 0
4.0 to 5.0
Zirconium (Zr), % 0
0.080 to 0.2
Residuals, % 0
0 to 0.15