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C18100 Copper vs. 85-platinum 15-iridium

C18100 copper belongs to the copper 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 (11, 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 C18100 copper and the bottom bar is 85-platinum 15-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
220
Elongation at Break, % 8.3
5.5 to 34
Poisson's Ratio 0.34
0.38
Shear Modulus, GPa 47
81
Shear Strength, MPa 300
370 to 420
Tensile Strength: Ultimate (UTS), MPa 510
560 to 730

Thermal Properties

Latent Heat of Fusion, J/g 210
110
Melting Completion (Liquidus), °C 1080
1820
Melting Onset (Solidus), °C 1020
1790
Specific Heat Capacity, J/kg-K 390
130
Thermal Expansion, µm/m-K 17
8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 80
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 81
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.9
22

Common Calculations

Stiffness to Weight: Axial, points 7.3
5.7
Stiffness to Weight: Bending, points 18
9.3
Strength to Weight: Axial, points 16
7.1 to 9.3
Strength to Weight: Bending, points 16
6.9 to 8.3
Thermal Shock Resistance, points 18
21 to 28

Alloy Composition

Chromium (Cr), % 0.4 to 1.2
0
Copper (Cu), % 98.7 to 99.49
0
Iridium (Ir), % 0
14.5 to 15.5
Magnesium (Mg), % 0.030 to 0.060
0
Platinum (Pt), % 0
84.3 to 85.5
Zirconium (Zr), % 0.080 to 0.2
0
Residuals, % 0
0 to 0.2