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Zamak 2 vs. R30021 Cobalt

Zamak 2 belongs to the zinc alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is Zamak 2 and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 640
1300
Elastic (Young's, Tensile) Modulus, GPa 87
220
Elongation at Break, % 6.0
9.0
Fatigue Strength, MPa 59
250
Poisson's Ratio 0.26
0.29
Shear Modulus, GPa 33
86
Tensile Strength: Ultimate (UTS), MPa 360
700
Tensile Strength: Yield (Proof), MPa 270
500

Thermal Properties

Latent Heat of Fusion, J/g 130
330
Melting Completion (Liquidus), °C 390
1350
Melting Onset (Solidus), °C 380
1190
Specific Heat Capacity, J/kg-K 410
450
Thermal Conductivity, W/m-K 110
15
Thermal Expansion, µm/m-K 28
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 35
2.1

Otherwise Unclassified Properties

Density, g/cm3 6.5
8.4
Embodied Carbon, kg CO2/kg material 3.0
8.0
Embodied Energy, MJ/kg 57
110
Embodied Water, L/kg 380
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 20
57
Resilience: Unit (Modulus of Resilience), kJ/m3 420
570
Stiffness to Weight: Axial, points 7.5
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 15
23
Strength to Weight: Bending, points 17
21
Thermal Diffusivity, mm2/s 41
3.8
Thermal Shock Resistance, points 11
21

Alloy Composition

Aluminum (Al), % 3.5 to 4.3
0
Cadmium (Cd), % 0 to 0.0050
0
Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 2.5 to 3.3
0
Iron (Fe), % 0 to 0.1
0 to 3.0
Lead (Pb), % 0 to 0.0050
0
Magnesium (Mg), % 0.020 to 0.060
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 0.020
2.0 to 3.0
Silicon (Si), % 0 to 0.030
0 to 1.5
Tin (Sn), % 0 to 0.0030
0
Zinc (Zn), % 92.2 to 94
0