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ASTM B596 Au-Cu vs. ZK51A Magnesium

ASTM B596 Au-Cu belongs to the otherwise unclassified metals classification, while ZK51A magnesium belongs to the magnesium alloys. There are 19 material properties with values for both materials. Properties with values for just one material (12, 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 B596 Au-Cu and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
45
Elongation at Break, % 4.3 to 17
4.7
Poisson's Ratio 0.41
0.29
Shear Modulus, GPa 36
18
Shear Strength, MPa 280 to 360
160
Tensile Strength: Ultimate (UTS), MPa 450 to 620
240

Thermal Properties

Latent Heat of Fusion, J/g 77
340
Melting Completion (Liquidus), °C 1060
640
Melting Onset (Solidus), °C 930
550
Specific Heat Capacity, J/kg-K 150
970
Thermal Expansion, µm/m-K 14
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
28
Electrical Conductivity: Equal Weight (Specific), % IACS 6.7
140

Otherwise Unclassified Properties

Density, g/cm3 18
1.8

Common Calculations

Stiffness to Weight: Axial, points 3.1
14
Stiffness to Weight: Bending, points 8.5
64
Strength to Weight: Axial, points 6.8 to 9.4
36
Strength to Weight: Bending, points 7.1 to 8.8
47
Thermal Shock Resistance, points 22 to 30
15

Alloy Composition

Copper (Cu), % 9.0 to 11
0 to 0.1
Gold (Au), % 89 to 91
0
Magnesium (Mg), % 0
93.1 to 95.9
Nickel (Ni), % 0
0 to 0.010
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3