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ASTM B477 Au-Ni-Ag vs. 85-platinum 15-iridium

Both ASTM B477 Au-Ni-Ag and 85-platinum 15-iridium are otherwise unclassified metals. There are 19 material properties with values for both materials. Properties with values for just one material (1, 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 85-platinum 15-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 95
220
Elongation at Break, % 5.5 to 11
5.5 to 34
Poisson's Ratio 0.41
0.38
Shear Modulus, GPa 34
81
Shear Strength, MPa 190 to 320
370 to 420
Tensile Strength: Ultimate (UTS), MPa 310 to 550
560 to 730

Thermal Properties

Latent Heat of Fusion, J/g 80
110
Melting Completion (Liquidus), °C 1010
1820
Melting Onset (Solidus), °C 930
1790
Specific Heat Capacity, J/kg-K 160
130
Thermal Expansion, µm/m-K 15
8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 7.5
2.6

Otherwise Unclassified Properties

Density, g/cm3 17
22

Common Calculations

Stiffness to Weight: Axial, points 3.1
5.7
Stiffness to Weight: Bending, points 8.9
9.3
Strength to Weight: Axial, points 5.0 to 9.0
7.1 to 9.3
Strength to Weight: Bending, points 6.0 to 8.8
6.9 to 8.3
Thermal Shock Resistance, points 16 to 28
21 to 28

Alloy Composition

Gold (Au), % 74.2 to 75.8
0
Iridium (Ir), % 0
14.5 to 15.5
Nickel (Ni), % 2.6 to 3.4
0
Platinum (Pt), % 0
84.3 to 85.5
Silver (Ag), % 21.4 to 22.6
0
Residuals, % 0
0 to 0.2