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AZ91B Magnesium vs. ASTM B631 Class B

AZ91B magnesium belongs to the magnesium alloys classification, while ASTM B631 class B belongs to the otherwise unclassified metals. There are 16 material properties with values for both materials. Properties with values for just one material (18, 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 ASTM B631 class B.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
210
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
78 to 79

Thermal Properties

Latent Heat of Fusion, J/g 360
150
Melting Completion (Liquidus), °C 600
2460 to 2480
Specific Heat Capacity, J/kg-K 990
170
Thermal Conductivity, W/m-K 73
450
Thermal Expansion, µm/m-K 26
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
50 to 53
Electrical Conductivity: Equal Weight (Specific), % IACS 58
32 to 34

Otherwise Unclassified Properties

Density, g/cm3 1.7
14
Embodied Carbon, kg CO2/kg material 22
49
Embodied Energy, MJ/kg 160
760

Common Calculations

Stiffness to Weight: Axial, points 15
8.1
Stiffness to Weight: Bending, points 69
14
Thermal Diffusivity, mm2/s 42
190