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85-platinum 15-iridium vs. QE22A Magnesium

85-platinum 15-iridium belongs to the otherwise unclassified metals classification, while QE22A magnesium belongs to the magnesium alloys. There are 19 material properties with values for both materials. Properties with values for just one material (13, 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 85-platinum 15-iridium and the bottom bar is QE22A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
44
Elongation at Break, % 5.5 to 34
2.4
Poisson's Ratio 0.38
0.29
Shear Modulus, GPa 81
17
Shear Strength, MPa 370 to 420
150
Tensile Strength: Ultimate (UTS), MPa 560 to 730
250

Thermal Properties

Latent Heat of Fusion, J/g 110
340
Melting Completion (Liquidus), °C 1820
640
Melting Onset (Solidus), °C 1790
570
Specific Heat Capacity, J/kg-K 130
970
Thermal Expansion, µm/m-K 8.4
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.2
25
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
120

Otherwise Unclassified Properties

Density, g/cm3 22
2.0

Common Calculations

Stiffness to Weight: Axial, points 5.7
13
Stiffness to Weight: Bending, points 9.3
60
Strength to Weight: Axial, points 7.1 to 9.3
36
Strength to Weight: Bending, points 6.9 to 8.3
46
Thermal Shock Resistance, points 21 to 28
15

Alloy Composition

Copper (Cu), % 0
0 to 0.1
Iridium (Ir), % 14.5 to 15.5
0
Magnesium (Mg), % 0
93.1 to 95.8
Nickel (Ni), % 0
0 to 0.010
Platinum (Pt), % 84.3 to 85.5
0
Silver (Ag), % 0
2.0 to 3.0
Unspecified Rare Earths, % 0
1.8 to 2.5
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3