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R30021 Cobalt vs. ZA-12

R30021 cobalt belongs to the cobalt alloys classification, while ZA-12 belongs to the zinc alloys. There are 28 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is ZA-12.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1300
230 to 270
Elastic (Young's, Tensile) Modulus, GPa 220
83
Elongation at Break, % 9.0
1.6 to 5.3
Fatigue Strength, MPa 250
73 to 120
Poisson's Ratio 0.29
0.26
Shear Modulus, GPa 86
33
Tensile Strength: Ultimate (UTS), MPa 700
260 to 400
Tensile Strength: Yield (Proof), MPa 500
210 to 320

Thermal Properties

Latent Heat of Fusion, J/g 330
120
Melting Completion (Liquidus), °C 1350
430
Melting Onset (Solidus), °C 1190
380
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 15
120
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
28
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
42

Otherwise Unclassified Properties

Density, g/cm3 8.4
6.0
Embodied Carbon, kg CO2/kg material 8.0
3.4
Embodied Energy, MJ/kg 110
64
Embodied Water, L/kg 520
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
4.0 to 20
Resilience: Unit (Modulus of Resilience), kJ/m3 570
260 to 620
Stiffness to Weight: Axial, points 15
7.6
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
12 to 19
Strength to Weight: Bending, points 21
15 to 20
Thermal Diffusivity, mm2/s 3.8
43
Thermal Shock Resistance, points 21
9.4 to 14

Alloy Composition

Aluminum (Al), % 0
10.5 to 11.5
Cadmium (Cd), % 0
0 to 0.0060
Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0.5 to 1.2
Iron (Fe), % 0 to 3.0
0 to 0.075
Lead (Pb), % 0
0 to 0.0060
Magnesium (Mg), % 0
0.015 to 0.030
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0 to 0.020
Silicon (Si), % 0 to 1.5
0 to 0.060
Tin (Sn), % 0
0 to 0.0030
Zinc (Zn), % 0
87.1 to 89