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AZ81A Magnesium vs. ASTM B541 Gold

AZ81A magnesium belongs to the magnesium alloys classification, while ASTM B541 gold belongs to the otherwise unclassified metals. There are 22 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 AZ81A magnesium and the bottom bar is ASTM B541 gold.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 3.0 to 8.8
6.0 to 14
Poisson's Ratio 0.29
0.4
Shear Modulus, GPa 18
38
Shear Strength, MPa 91 to 130
410 to 690
Tensile Strength: Ultimate (UTS), MPa 160 to 240
670 to 1180
Tensile Strength: Yield (Proof), MPa 84
480 to 900

Thermal Properties

Latent Heat of Fusion, J/g 350
90
Melting Completion (Liquidus), °C 600
1110
Melting Onset (Solidus), °C 500
930
Specific Heat Capacity, J/kg-K 990
170
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
7.7 to 12
Electrical Conductivity: Equal Weight (Specific), % IACS 65
4.0 to 6.2

Otherwise Unclassified Properties

Density, g/cm3 1.7
17

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
65 to 91
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
1090 to 3830
Stiffness to Weight: Axial, points 15
3.4
Stiffness to Weight: Bending, points 70
9.0
Strength to Weight: Axial, points 26 to 39
11 to 19
Strength to Weight: Bending, points 38 to 50
9.8 to 14
Thermal Shock Resistance, points 9.1 to 14
36 to 63

Alloy Composition


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Aluminum (Al), % 7.0 to 8.1
0
Copper (Cu), % 0 to 0.1
13.5 to 15.5
Gold (Au), % 0
70.5 to 72.5
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0
Nickel (Ni), % 0 to 0.010
0
Platinum (Pt), % 0
8.0 to 9.0
Silicon (Si), % 0 to 0.3
0
Silver (Ag), % 0
4.0 to 5.0
Zinc (Zn), % 0.4 to 1.0
0.7 to 1.3
Residuals, % 0 to 0.3
0 to 0.4