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AZ91B Magnesium vs. Grade 365 Molybdenum

AZ91B magnesium belongs to the magnesium alloys classification, while grade 365 molybdenum belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (13, 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 grade 365 molybdenum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
310
Elongation at Break, % 5.0
6.3
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
120
Tensile Strength: Ultimate (UTS), MPa 240
620
Tensile Strength: Yield (Proof), MPa 160
530

Thermal Properties

Latent Heat of Fusion, J/g 360
370
Specific Heat Capacity, J/kg-K 990
250
Thermal Expansion, µm/m-K 26
7.0

Otherwise Unclassified Properties

Density, g/cm3 1.7
10
Embodied Carbon, kg CO2/kg material 22
28
Embodied Energy, MJ/kg 160
330
Embodied Water, L/kg 990
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
37
Resilience: Unit (Modulus of Resilience), kJ/m3 280
450
Stiffness to Weight: Axial, points 15
17
Stiffness to Weight: Bending, points 69
22
Strength to Weight: Axial, points 38
17
Strength to Weight: Bending, points 49
16
Thermal Shock Resistance, points 14
21

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.010
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
0 to 0.010
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Molybdenum (Mo), % 0
99.9 to 100
Nickel (Ni), % 0 to 0.030
0 to 0.0020
Nitrogen (N), % 0
0 to 0.0020
Oxygen (O), % 0
0 to 0.0015
Silicon (Si), % 0 to 0.5
0 to 0.010
Zinc (Zn), % 0.35 to 1.0
0