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R31539 Cobalt vs. ZA-8

R31539 cobalt belongs to the cobalt alloys classification, while ZA-8 belongs to the zinc alloys. There are 27 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is ZA-8.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
85 to 86
Elongation at Break, % 13 to 22
1.3 to 8.0
Fatigue Strength, MPa 310 to 480
51 to 100
Poisson's Ratio 0.29
0.26
Shear Modulus, GPa 86
34
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
210 to 370
Tensile Strength: Yield (Proof), MPa 590 to 940
210 to 290

Thermal Properties

Latent Heat of Fusion, J/g 320
110
Melting Completion (Liquidus), °C 1360
400
Melting Onset (Solidus), °C 1290
380
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 13
120
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
28
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
40

Otherwise Unclassified Properties

Density, g/cm3 8.4
6.3
Embodied Carbon, kg CO2/kg material 8.2
3.3
Embodied Energy, MJ/kg 110
62
Embodied Water, L/kg 530
420

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
2.8 to 28
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
260 to 490
Stiffness to Weight: Axial, points 15
7.5
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 33 to 44
9.3 to 17
Strength to Weight: Bending, points 27 to 32
12 to 18
Thermal Diffusivity, mm2/s 3.5
42
Thermal Shock Resistance, points 24 to 32
7.6 to 13

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
8.0 to 8.8
Cadmium (Cd), % 0
0 to 0.0060
Carbon (C), % 0 to 0.14
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
0.8 to 1.3
Iron (Fe), % 0 to 0.75
0 to 0.075
Lanthanum (La), % 0.030 to 0.2
0
Lead (Pb), % 0
0 to 0.0060
Magnesium (Mg), % 0
0.015 to 0.030
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0 to 0.020
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0 to 0.045
Tin (Sn), % 0
0 to 0.0030
Zinc (Zn), % 0
89.7 to 91.2

Comparable Variants