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AZ91A Magnesium vs. Grade 366 Molybdenum

AZ91A magnesium belongs to the magnesium alloys classification, while grade 366 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 AZ91A magnesium and the bottom bar is grade 366 molybdenum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
300
Elongation at Break, % 5.0
2.2
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 18
120
Tensile Strength: Ultimate (UTS), MPa 240
580
Tensile Strength: Yield (Proof), MPa 160
470

Thermal Properties

Latent Heat of Fusion, J/g 360
310
Specific Heat Capacity, J/kg-K 990
210
Thermal Expansion, µm/m-K 26
7.6

Otherwise Unclassified Properties

Density, g/cm3 1.7
12
Embodied Carbon, kg CO2/kg material 22
27
Embodied Energy, MJ/kg 160
340
Embodied Water, L/kg 990
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
12
Resilience: Unit (Modulus of Resilience), kJ/m3 280
370
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
18
Strength to Weight: Axial, points 38
13
Strength to Weight: Bending, points 49
13
Thermal Shock Resistance, points 14
18

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.030
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
0 to 0.010
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Molybdenum (Mo), % 0
66.9 to 73
Nickel (Ni), % 0 to 0.030
0 to 0.0020
Nitrogen (N), % 0
0 to 0.0020
Oxygen (O), % 0
0 to 0.0025
Silicon (Si), % 0 to 0.5
0 to 0.010
Tungsten (W), % 0
27 to 33
Zinc (Zn), % 0.35 to 1.0
0