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R30816 Cobalt vs. Zamak 7

R30816 cobalt belongs to the cobalt alloys classification, while Zamak 7 belongs to the zinc alloys. There are 26 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 R30816 cobalt and the bottom bar is Zamak 7.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
80
Elastic (Young's, Tensile) Modulus, GPa 210
86
Elongation at Break, % 23
13
Fatigue Strength, MPa 250
47
Poisson's Ratio 0.3
0.25
Shear Modulus, GPa 81
33
Tensile Strength: Ultimate (UTS), MPa 1020
280
Tensile Strength: Yield (Proof), MPa 460
250

Thermal Properties

Latent Heat of Fusion, J/g 300
120
Melting Completion (Liquidus), °C 1540
390
Melting Onset (Solidus), °C 1460
380
Specific Heat Capacity, J/kg-K 420
410
Thermal Conductivity, W/m-K 13
110
Thermal Expansion, µm/m-K 12
27

Otherwise Unclassified Properties

Density, g/cm3 9.1
6.4
Embodied Carbon, kg CO2/kg material 20
3.0
Embodied Energy, MJ/kg 320
57
Embodied Water, L/kg 440
380

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
36
Resilience: Unit (Modulus of Resilience), kJ/m3 510
370
Stiffness to Weight: Axial, points 13
7.5
Stiffness to Weight: Bending, points 22
23
Strength to Weight: Axial, points 31
12
Strength to Weight: Bending, points 25
15
Thermal Diffusivity, mm2/s 3.3
43
Thermal Shock Resistance, points 28
8.6

Alloy Composition

Aluminum (Al), % 0
3.5 to 4.3
Cadmium (Cd), % 0
0 to 0.0020
Carbon (C), % 0.32 to 0.42
0
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 5.0
0 to 0.075
Lead (Pb), % 0
0 to 0.0030
Magnesium (Mg), % 0
0.0050 to 0.020
Manganese (Mn), % 1.0 to 2.0
0
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
0.0050 to 0.020
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 3.5 to 4.5
0
Tin (Sn), % 0
0 to 0.0010
Tungsten (W), % 3.5 to 4.5
0
Zinc (Zn), % 0
95.3 to 96.5