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90-platinum 10-iridium vs. ASTM B477 Au-Ni-Ag

Both 90-platinum 10-iridium and ASTM B477 Au-Ni-Ag are otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is 90-platinum 10-iridium and the bottom bar is ASTM B477 Au-Ni-Ag.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
95
Elongation at Break, % 5.5 to 34
5.5 to 11
Poisson's Ratio 0.38
0.41
Shear Modulus, GPa 74
34
Shear Strength, MPa 220 to 320
190 to 320
Tensile Strength: Ultimate (UTS), MPa 330 to 550
310 to 550

Thermal Properties

Latent Heat of Fusion, J/g 100
80
Specific Heat Capacity, J/kg-K 130
160
Thermal Expansion, µm/m-K 8.6
15

Otherwise Unclassified Properties

Density, g/cm3 22
17

Common Calculations

Stiffness to Weight: Axial, points 5.3
3.1
Stiffness to Weight: Bending, points 9.1
8.9
Strength to Weight: Axial, points 4.2 to 7.1
5.0 to 9.0
Strength to Weight: Bending, points 4.9 to 6.9
6.0 to 8.8
Thermal Shock Resistance, points 13 to 22
16 to 28

Alloy Composition

Gold (Au), % 0
74.2 to 75.8
Iridium (Ir), % 9.5 to 10.5
0
Nickel (Ni), % 0
2.6 to 3.4
Platinum (Pt), % 89.3 to 90.5
0
Silver (Ag), % 0
21.4 to 22.6
Residuals, % 0
0 to 0.3