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ASTM B631 Class A vs. AZ91E Magnesium

ASTM B631 class A belongs to the otherwise unclassified metals classification, while AZ91E magnesium belongs to the magnesium alloys. There are 16 material properties with values for both materials. Properties with values for just one material (20, 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 ASTM B631 class A and the bottom bar is AZ91E magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
46
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 85 to 86
18

Thermal Properties

Latent Heat of Fusion, J/g 160
350
Melting Completion (Liquidus), °C 2680 to 2690
600
Specific Heat Capacity, J/kg-K 160
990
Thermal Conductivity, W/m-K 420
84
Thermal Expansion, µm/m-K 11
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40 to 47
10 to 12
Electrical Conductivity: Equal Weight (Specific), % IACS 25 to 29
52 to 60

Otherwise Unclassified Properties

Density, g/cm3 15
1.7
Embodied Carbon, kg CO2/kg material 43
22
Embodied Energy, MJ/kg 670
160

Common Calculations

Stiffness to Weight: Axial, points 8.5
15
Stiffness to Weight: Bending, points 14
69
Thermal Diffusivity, mm2/s 180
49