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Annealed 90-platinum 10-iridium vs. Annealed Silver

Both annealed 90-platinum 10-iridium and annealed silver are otherwise unclassified metals. Both are furnished in the annealed condition. There are 16 material properties with values for both materials. Properties with values for just one material (5, 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 annealed 90-platinum 10-iridium and the bottom bar is annealed silver.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 34
29
Poisson's Ratio 0.38
0.37
Shear Modulus, GPa 74
26
Shear Strength, MPa 220
120
Tensile Strength: Ultimate (UTS), MPa 330
190

Thermal Properties

Latent Heat of Fusion, J/g 100
110
Melting Completion (Liquidus), °C 1830
960
Specific Heat Capacity, J/kg-K 130
240
Thermal Expansion, µm/m-K 8.6
20

Otherwise Unclassified Properties

Density, g/cm3 22
10

Common Calculations

Stiffness to Weight: Axial, points 5.3
3.8
Stiffness to Weight: Bending, points 9.1
13
Strength to Weight: Axial, points 4.2
4.9
Strength to Weight: Bending, points 4.9
6.9
Thermal Shock Resistance, points 13
9.5

Alloy Composition


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Iridium (Ir), % 9.5 to 10.5
0
Platinum (Pt), % 89.3 to 90.5
0
Silver (Ag), % 0
99.9 to 100
Residuals, % 0 to 0.2
0 to 0.1