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AZ81A Magnesium vs. ASTM B617 Coin Silver

AZ81A magnesium belongs to the magnesium alloys classification, while ASTM B617 coin silver 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 AZ81A magnesium and the bottom bar is ASTM B617 coin silver.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
75
Elongation at Break, % 3.0 to 8.8
1.1 to 22
Poisson's Ratio 0.29
0.37
Shear Modulus, GPa 18
28
Shear Strength, MPa 91 to 130
180 to 290
Tensile Strength: Ultimate (UTS), MPa 160 to 240
290 to 520

Thermal Properties

Latent Heat of Fusion, J/g 350
120
Melting Completion (Liquidus), °C 600
870
Melting Onset (Solidus), °C 500
780
Specific Heat Capacity, J/kg-K 990
250
Thermal Expansion, µm/m-K 27
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
83
Electrical Conductivity: Equal Weight (Specific), % IACS 65
72

Otherwise Unclassified Properties

Density, g/cm3 1.7
10

Common Calculations

Stiffness to Weight: Axial, points 15
4.1
Stiffness to Weight: Bending, points 70
14
Strength to Weight: Axial, points 26 to 39
7.7 to 14
Strength to Weight: Bending, points 38 to 50
9.3 to 14
Thermal Shock Resistance, points 9.1 to 14
14 to 25

Alloy Composition


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Aluminum (Al), % 7.0 to 8.1
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Copper (Cu), % 0 to 0.1
9.0 to 10.4
Iron (Fe), % 0
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0
Nickel (Ni), % 0 to 0.010
0 to 0.010
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.3
0
Silver (Ag), % 0
89.6 to 91
Zinc (Zn), % 0.4 to 1.0
0 to 0.060
Residuals, % 0 to 0.3
0 to 0.060