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AZ91B Magnesium vs. AWS BVAu-4

AZ91B magnesium belongs to the magnesium alloys classification, while AWS BVAu-4 belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (19, 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 AWS BVAu-4.

AZ91B (AZ91B-F, M11912) MagnesiumAWS BVAu-4 (P00827) Vacuum Service Filler Metal
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
110
Poisson's Ratio 0.29
0.4
Shear Modulus, GPa 18
41
Tensile Strength: Ultimate (UTS), MPa 240
190

Thermal Properties

Latent Heat of Fusion, J/g 360
100
Melting Completion (Liquidus), °C 600
950
Melting Onset (Solidus), °C 470
950
Specific Heat Capacity, J/kg-K 990
190
Thermal Expansion, µm/m-K 26
14

Otherwise Unclassified Properties

Density, g/cm3 1.7
17

Common Calculations

Stiffness to Weight: Axial, points 15
3.6
Stiffness to Weight: Bending, points 69
9.3
Strength to Weight: Axial, points 38
3.0
Strength to Weight: Bending, points 49
4.2
Thermal Shock Resistance, points 14
8.7

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 0.35
0
Gold (Au), % 0
81.5 to 82.5
Lead (Pb), % 0
0 to 0.0020
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
17.5 to 18.5
Phosphorus (P), % 0
0 to 0.0020
Silicon (Si), % 0 to 0.5
0
Zinc (Zn), % 0.35 to 1.0
0 to 0.0010