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

Both ASTM B477 Au-Ni-Ag and 90-platinum 10-iridium 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 ASTM B477 Au-Ni-Ag and the bottom bar is 90-platinum 10-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

Density, g/cm3 17
22

Common Calculations

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

Alloy Composition

Gold (Au), % 74.2 to 75.8
0
Iridium (Ir), % 0
9.5 to 10.5
Nickel (Ni), % 2.6 to 3.4
0
Platinum (Pt), % 0
89.3 to 90.5
Silver (Ag), % 21.4 to 22.6
0
Residuals, % 0
0 to 0.2