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Annealed 90-platinum 10-iridium vs. Annealed ASTM B685 Alloy

Both annealed 90-platinum 10-iridium and annealed ASTM B685 alloy 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 (4, in this case) are not shown.

For each property being compared, the top bar is annealed 90-platinum 10-iridium and the bottom bar is annealed ASTM B685 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
120
Elongation at Break, % 34
23
Poisson's Ratio 0.38
0.37
Shear Modulus, GPa 74
43
Shear Strength, MPa 220
410
Tensile Strength: Ultimate (UTS), MPa 330
660

Thermal Properties

Latent Heat of Fusion, J/g 100
180
Melting Completion (Liquidus), °C 1830
1230
Specific Heat Capacity, J/kg-K 130
300
Thermal Expansion, µm/m-K 8.6
14

Otherwise Unclassified Properties

Density, g/cm3 22
11

Common Calculations

Stiffness to Weight: Axial, points 5.3
6.1
Stiffness to Weight: Bending, points 9.1
15
Strength to Weight: Axial, points 4.2
17
Strength to Weight: Bending, points 4.9
16
Thermal Shock Resistance, points 13
28

Alloy Composition

Aluminum (Al), % 0
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Copper (Cu), % 0
39.5 to 40.5
Iridium (Ir), % 9.5 to 10.5
0
Iron (Fe), % 0
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Palladium (Pd), % 0
59 to 60.5
Platinum (Pt), % 89.3 to 90.5
0
Silver (Ag), % 0
0 to 0.1
Zinc (Zn), % 0
0 to 0.060
Residuals, % 0
0 to 0.2