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R31538 Cobalt vs. Z21721 Zinc

R31538 cobalt belongs to the cobalt alloys classification, while Z21721 zinc belongs to the zinc alloys. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is Z21721 zinc.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
87
Elongation at Break, % 13 to 23
40
Poisson's Ratio 0.29
0.25
Shear Modulus, GPa 86
35
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
150
Tensile Strength: Yield (Proof), MPa 580 to 930
120

Thermal Properties

Latent Heat of Fusion, J/g 320
110
Melting Completion (Liquidus), °C 1360
410
Melting Onset (Solidus), °C 1290
390
Specific Heat Capacity, J/kg-K 450
390
Thermal Conductivity, W/m-K 13
110
Thermal Expansion, µm/m-K 13
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
27
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
37

Otherwise Unclassified Properties

Density, g/cm3 8.4
6.6
Embodied Carbon, kg CO2/kg material 8.1
2.8
Embodied Energy, MJ/kg 110
53
Embodied Water, L/kg 530
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
57
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
88
Stiffness to Weight: Axial, points 15
7.3
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 34 to 45
6.4
Strength to Weight: Bending, points 27 to 32
9.6
Thermal Diffusivity, mm2/s 3.5
44
Thermal Shock Resistance, points 25 to 33
4.8

Alloy Composition

Aluminum (Al), % 0
0 to 0.0020
Cadmium (Cd), % 0
0 to 0.070
Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0 to 0.0050
Iron (Fe), % 0 to 0.75
0 to 0.010
Lead (Pb), % 0
0 to 1.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0
Titanium (Ti), % 0
0 to 0.020
Zinc (Zn), % 0
98.9 to 100