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85-platinum 15-iridium vs. 4145 Aluminum

85-platinum 15-iridium belongs to the otherwise unclassified metals classification, while 4145 aluminum belongs to the aluminum alloys. There are 19 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 85-platinum 15-iridium and the bottom bar is 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
73
Elongation at Break, % 5.5 to 34
2.2
Poisson's Ratio 0.38
0.33
Shear Modulus, GPa 81
28
Shear Strength, MPa 370 to 420
69
Tensile Strength: Ultimate (UTS), MPa 560 to 730
120

Thermal Properties

Latent Heat of Fusion, J/g 110
540
Melting Completion (Liquidus), °C 1820
590
Melting Onset (Solidus), °C 1790
520
Specific Heat Capacity, J/kg-K 130
880
Thermal Expansion, µm/m-K 8.4
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.2
26
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
84

Otherwise Unclassified Properties

Density, g/cm3 22
2.8

Common Calculations

Stiffness to Weight: Axial, points 5.7
14
Stiffness to Weight: Bending, points 9.3
50
Strength to Weight: Axial, points 7.1 to 9.3
12
Strength to Weight: Bending, points 6.9 to 8.3
19
Thermal Shock Resistance, points 21 to 28
5.5

Alloy Composition

Aluminum (Al), % 0
83 to 87.4
Chromium (Cr), % 0
0 to 0.15
Copper (Cu), % 0
3.3 to 4.7
Iridium (Ir), % 14.5 to 15.5
0
Iron (Fe), % 0
0 to 0.8
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0
0 to 0.15
Platinum (Pt), % 84.3 to 85.5
0
Silicon (Si), % 0
9.3 to 10.7
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15