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AZ91A Magnesium vs. 85-platinum 15-iridium

AZ91A magnesium belongs to the magnesium alloys classification, while 85-platinum 15-iridium 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 AZ91A magnesium and the bottom bar is 85-platinum 15-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
220
Elongation at Break, % 5.0
5.5 to 34
Poisson's Ratio 0.29
0.38
Shear Modulus, GPa 18
81
Shear Strength, MPa 140
370 to 420
Tensile Strength: Ultimate (UTS), MPa 240
560 to 730

Thermal Properties

Latent Heat of Fusion, J/g 360
110
Melting Completion (Liquidus), °C 600
1820
Melting Onset (Solidus), °C 470
1790
Specific Heat Capacity, J/kg-K 990
130
Thermal Expansion, µm/m-K 26
8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 52
2.6

Otherwise Unclassified Properties

Density, g/cm3 1.7
22

Common Calculations

Stiffness to Weight: Axial, points 15
5.7
Stiffness to Weight: Bending, points 69
9.3
Strength to Weight: Axial, points 38
7.1 to 9.3
Strength to Weight: Bending, points 49
6.9 to 8.3
Thermal Shock Resistance, points 14
21 to 28

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Copper (Cu), % 0 to 0.1
0
Iridium (Ir), % 0
14.5 to 15.5
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0
Platinum (Pt), % 0
84.3 to 85.5
Silicon (Si), % 0 to 0.5
0
Zinc (Zn), % 0.35 to 1.0
0
Residuals, % 0
0 to 0.2