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ASTM B477 Au-Ni-Ag vs. EQ21A Magnesium

ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals classification, while EQ21A magnesium belongs to the magnesium alloys. There are 19 material properties with values for both materials. Properties with values for just one material (15, 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 B477 Au-Ni-Ag and the bottom bar is EQ21A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 95
44
Elongation at Break, % 5.5 to 11
2.4
Poisson's Ratio 0.41
0.29
Shear Modulus, GPa 34
17
Shear Strength, MPa 190 to 320
150
Tensile Strength: Ultimate (UTS), MPa 310 to 550
250

Thermal Properties

Latent Heat of Fusion, J/g 80
340
Melting Completion (Liquidus), °C 1010
640
Melting Onset (Solidus), °C 930
560
Specific Heat Capacity, J/kg-K 160
980
Thermal Expansion, µm/m-K 15
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
25
Electrical Conductivity: Equal Weight (Specific), % IACS 7.5
120

Otherwise Unclassified Properties

Density, g/cm3 17
1.9

Common Calculations

Stiffness to Weight: Axial, points 3.1
13
Stiffness to Weight: Bending, points 8.9
63
Strength to Weight: Axial, points 5.0 to 9.0
37
Strength to Weight: Bending, points 6.0 to 8.8
47
Thermal Shock Resistance, points 16 to 28
15

Alloy Composition

Copper (Cu), % 0
0.050 to 0.1
Gold (Au), % 74.2 to 75.8
0
Magnesium (Mg), % 0
93.9 to 96.8
Nickel (Ni), % 2.6 to 3.4
0 to 0.010
Silver (Ag), % 21.4 to 22.6
1.3 to 1.7
Unspecified Rare Earths, % 0
1.5 to 3.0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3