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AS41A Magnesium vs. R30155 Cobalt

AS41A magnesium belongs to the magnesium alloys classification, while R30155 cobalt belongs to the iron alloys. There are 28 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 AS41A magnesium and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
210
Elongation at Break, % 11
34
Fatigue Strength, MPa 100
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
81
Shear Strength, MPa 130
570
Tensile Strength: Ultimate (UTS), MPa 230
850
Tensile Strength: Yield (Proof), MPa 140
390

Thermal Properties

Latent Heat of Fusion, J/g 370
300
Maximum Temperature: Mechanical, °C 110
1100
Melting Completion (Liquidus), °C 620
1470
Melting Onset (Solidus), °C 570
1420
Specific Heat Capacity, J/kg-K 1000
450
Thermal Conductivity, W/m-K 68
12
Thermal Expansion, µm/m-K 26
14

Otherwise Unclassified Properties

Base Metal Price, % relative 12
80
Density, g/cm3 1.6
8.5
Embodied Carbon, kg CO2/kg material 23
9.7
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 980
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
230
Resilience: Unit (Modulus of Resilience), kJ/m3 220
370
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 72
23
Strength to Weight: Axial, points 38
28
Strength to Weight: Bending, points 50
24
Thermal Diffusivity, mm2/s 41
3.2
Thermal Shock Resistance, points 14
21

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
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 0.060
0
Iron (Fe), % 0
24.3 to 36.2
Magnesium (Mg), % 92.8 to 95.8
0
Manganese (Mn), % 0.2 to 0.5
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0 to 0.030
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), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 0 to 0.12
0