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85-platinum 15-iridium vs. EN AC-42200 Aluminum

85-platinum 15-iridium belongs to the otherwise unclassified metals classification, while EN AC-42200 aluminum belongs to the aluminum alloys. There are 18 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 EN AC-42200 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
70
Elongation at Break, % 5.5 to 34
3.0 to 6.7
Poisson's Ratio 0.38
0.33
Shear Modulus, GPa 81
26
Tensile Strength: Ultimate (UTS), MPa 560 to 730
320

Thermal Properties

Latent Heat of Fusion, J/g 110
500
Melting Completion (Liquidus), °C 1820
610
Melting Onset (Solidus), °C 1790
600
Specific Heat Capacity, J/kg-K 130
910
Thermal Expansion, µm/m-K 8.4
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.2
40
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
140

Otherwise Unclassified Properties

Density, g/cm3 22
2.6

Common Calculations

Stiffness to Weight: Axial, points 5.7
15
Stiffness to Weight: Bending, points 9.3
53
Strength to Weight: Axial, points 7.1 to 9.3
34 to 35
Strength to Weight: Bending, points 6.9 to 8.3
40 to 41
Thermal Shock Resistance, points 21 to 28
15

Alloy Composition

Aluminum (Al), % 0
91 to 93.1
Copper (Cu), % 0
0 to 0.050
Iridium (Ir), % 14.5 to 15.5
0
Iron (Fe), % 0
0 to 0.19
Magnesium (Mg), % 0
0.45 to 0.7
Manganese (Mn), % 0
0 to 0.1
Platinum (Pt), % 84.3 to 85.5
0
Silicon (Si), % 0
6.5 to 7.5
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
0 to 0.070
Residuals, % 0
0 to 0.1