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AZ91B Magnesium vs. ASTM B596 Au-Cu

AZ91B magnesium belongs to the magnesium alloys classification, while ASTM B596 Au-Cu belongs to the otherwise unclassified metals. There are 19 material properties with values for both materials. Properties with values for just one material (14, 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 B596 Au-Cu.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
100
Elongation at Break, % 5.0
4.3 to 17
Poisson's Ratio 0.29
0.41
Shear Modulus, GPa 18
36
Shear Strength, MPa 140
280 to 360
Tensile Strength: Ultimate (UTS), MPa 240
450 to 620

Thermal Properties

Latent Heat of Fusion, J/g 360
77
Melting Completion (Liquidus), °C 600
1060
Melting Onset (Solidus), °C 470
930
Specific Heat Capacity, J/kg-K 990
150
Thermal Expansion, µm/m-K 26
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
14
Electrical Conductivity: Equal Weight (Specific), % IACS 58
6.7

Otherwise Unclassified Properties

Density, g/cm3 1.7
18

Common Calculations

Stiffness to Weight: Axial, points 15
3.1
Stiffness to Weight: Bending, points 69
8.5
Strength to Weight: Axial, points 38
6.8 to 9.4
Strength to Weight: Bending, points 49
7.1 to 8.8
Thermal Shock Resistance, points 14
22 to 30

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Copper (Cu), % 0 to 0.35
9.0 to 11
Gold (Au), % 0
89 to 91
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0
Zinc (Zn), % 0.35 to 1.0
0
Residuals, % 0
0 to 0.4