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AZ91D Magnesium vs. AWS BVAg-8

AZ91D magnesium belongs to the magnesium alloys classification, while AWS BVAg-8 belongs to the otherwise unclassified metals. There are 15 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 AZ91D magnesium and the bottom bar is AWS BVAg-8.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
84
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 18
31
Tensile Strength: Ultimate (UTS), MPa 160 to 220
170

Thermal Properties

Latent Heat of Fusion, J/g 350
140
Melting Completion (Liquidus), °C 600
780
Melting Onset (Solidus), °C 490
780
Specific Heat Capacity, J/kg-K 990
280
Thermal Expansion, µm/m-K 27
19

Otherwise Unclassified Properties

Density, g/cm3 1.7
10

Common Calculations

Stiffness to Weight: Axial, points 15
4.6
Stiffness to Weight: Bending, points 69
14
Strength to Weight: Axial, points 26 to 34
4.7
Strength to Weight: Bending, points 38 to 46
6.8
Thermal Shock Resistance, points 9.5 to 13
7.6

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Cadmium (Cd), % 0
0 to 0.0010
Carbon (C), % 0
0 to 0.0050
Copper (Cu), % 0 to 0.030
27 to 29
Iron (Fe), % 0 to 0.0050
0
Lead (Pb), % 0
0 to 0.0020
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0
Nickel (Ni), % 0 to 0.0020
0
Phosphorus (P), % 0
0 to 0.0020
Silicon (Si), % 0 to 0.1
0
Silver (Ag), % 0
71 to 73
Zinc (Zn), % 0.35 to 1.0
0 to 0.0010