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Zamak 7 vs. R31538 Cobalt

Zamak 7 belongs to the zinc alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 27 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 Zamak 7 and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 86
220
Elongation at Break, % 13
13 to 23
Fatigue Strength, MPa 47
310 to 480
Poisson's Ratio 0.25
0.29
Shear Modulus, GPa 33
86
Tensile Strength: Ultimate (UTS), MPa 280
1020 to 1360
Tensile Strength: Yield (Proof), MPa 250
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 120
320
Melting Completion (Liquidus), °C 390
1360
Melting Onset (Solidus), °C 380
1290
Specific Heat Capacity, J/kg-K 410
450
Thermal Conductivity, W/m-K 110
13
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 38
2.1

Otherwise Unclassified Properties

Density, g/cm3 6.4
8.4
Embodied Carbon, kg CO2/kg material 3.0
8.1
Embodied Energy, MJ/kg 57
110
Embodied Water, L/kg 380
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 36
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 370
750 to 1920
Stiffness to Weight: Axial, points 7.5
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 12
34 to 45
Strength to Weight: Bending, points 15
27 to 32
Thermal Diffusivity, mm2/s 43
3.5
Thermal Shock Resistance, points 8.6
25 to 33

Alloy Composition

Aluminum (Al), % 3.5 to 4.3
0
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.075
0 to 0.75
Lead (Pb), % 0 to 0.0030
0
Magnesium (Mg), % 0.0050 to 0.020
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0.0050 to 0.020
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0
0 to 1.0
Tin (Sn), % 0 to 0.0010
0
Zinc (Zn), % 95.3 to 96.5
0