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R30021 Cobalt vs. 705.0 Aluminum

R30021 cobalt belongs to the cobalt alloys classification, while 705.0 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, 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 R30021 cobalt and the bottom bar is 705.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
69
Elongation at Break, % 9.0
8.4 to 10
Fatigue Strength, MPa 250
63 to 98
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 700
240 to 260
Tensile Strength: Yield (Proof), MPa 500
130

Thermal Properties

Latent Heat of Fusion, J/g 330
390
Melting Completion (Liquidus), °C 1350
640
Melting Onset (Solidus), °C 1190
610
Specific Heat Capacity, J/kg-K 450
890
Thermal Conductivity, W/m-K 15
140
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
34
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
110

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.8
Embodied Carbon, kg CO2/kg material 8.0
8.4
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 520
1170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
18 to 20
Resilience: Unit (Modulus of Resilience), kJ/m3 570
120 to 130
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
49
Strength to Weight: Axial, points 23
24 to 26
Strength to Weight: Bending, points 21
31 to 32
Thermal Diffusivity, mm2/s 3.8
55
Thermal Shock Resistance, points 21
11

Alloy Composition


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Aluminum (Al), % 0
92.3 to 98.6
Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0 to 0.4
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 0 to 3.0
0 to 0.8
Magnesium (Mg), % 0
1.4 to 1.8
Manganese (Mn), % 0
0 to 0.6
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Silicon (Si), % 0 to 1.5
0 to 0.2
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
0 to 3.3
Residuals, % 0
0 to 0.15