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Zamak 7 vs. R30155 Cobalt

Zamak 7 belongs to the zinc alloys classification, while R30155 cobalt belongs to the iron alloys. There are 29 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 7 and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 80
220
Elastic (Young's, Tensile) Modulus, GPa 86
210
Elongation at Break, % 13
34
Fatigue Strength, MPa 47
310
Poisson's Ratio 0.25
0.29
Shear Modulus, GPa 33
81
Shear Strength, MPa 210
570
Tensile Strength: Ultimate (UTS), MPa 280
850
Tensile Strength: Yield (Proof), MPa 250
390

Thermal Properties

Latent Heat of Fusion, J/g 120
300
Maximum Temperature: Mechanical, °C 95
1100
Melting Completion (Liquidus), °C 390
1470
Melting Onset (Solidus), °C 380
1420
Specific Heat Capacity, J/kg-K 410
450
Thermal Conductivity, W/m-K 110
12
Thermal Expansion, µm/m-K 27
14

Otherwise Unclassified Properties

Base Metal Price, % relative 11
80
Density, g/cm3 6.4
8.5
Embodied Carbon, kg CO2/kg material 3.0
9.7
Embodied Energy, MJ/kg 57
150
Embodied Water, L/kg 380
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 36
230
Resilience: Unit (Modulus of Resilience), kJ/m3 370
370
Stiffness to Weight: Axial, points 7.5
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 12
28
Strength to Weight: Bending, points 15
24
Thermal Diffusivity, mm2/s 43
3.2
Thermal Shock Resistance, points 8.6
21

Alloy Composition

Aluminum (Al), % 3.5 to 4.3
0
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0.080 to 0.16
Chromium (Cr), % 0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.075
24.3 to 36.2
Lead (Pb), % 0 to 0.0030
0
Magnesium (Mg), % 0.0050 to 0.020
0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0.0050 to 0.020
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tin (Sn), % 0 to 0.0010
0
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 95.3 to 96.5
0