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AZ91B Magnesium vs. G-CoCr28 Cobalt

AZ91B magnesium belongs to the magnesium alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is AZ91B magnesium and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
210
Elongation at Break, % 5.0
6.7
Fatigue Strength, MPa 79
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
83
Tensile Strength: Ultimate (UTS), MPa 240
560
Tensile Strength: Yield (Proof), MPa 160
260

Thermal Properties

Latent Heat of Fusion, J/g 360
320
Maximum Temperature: Mechanical, °C 130
1200
Melting Completion (Liquidus), °C 600
1330
Melting Onset (Solidus), °C 470
1270
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
8.5
Thermal Expansion, µm/m-K 26
14

Otherwise Unclassified Properties

Base Metal Price, % relative 12
100
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 22
6.2
Embodied Energy, MJ/kg 160
84
Embodied Water, L/kg 990
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
31
Resilience: Unit (Modulus of Resilience), kJ/m3 280
160
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
19
Strength to Weight: Bending, points 49
19
Thermal Diffusivity, mm2/s 42
2.2
Thermal Shock Resistance, points 14
14

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.050 to 0.25
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
9.7 to 24.5
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.030
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0.5 to 1.5
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0