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Grade Ti-Pd18 Titanium vs. 85-platinum 15-iridium

Grade Ti-Pd18 titanium belongs to the titanium alloys classification, while 85-platinum 15-iridium belongs to the otherwise unclassified metals. There are 18 material properties with values for both materials. Properties with values for just one material (13, 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 grade Ti-Pd18 titanium and the bottom bar is 85-platinum 15-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 17
5.5 to 34
Poisson's Ratio 0.32
0.38
Shear Modulus, GPa 40
81
Tensile Strength: Ultimate (UTS), MPa 710
560 to 730

Thermal Properties

Latent Heat of Fusion, J/g 410
110
Melting Completion (Liquidus), °C 1640
1820
Melting Onset (Solidus), °C 1590
1790
Specific Heat Capacity, J/kg-K 550
130
Thermal Expansion, µm/m-K 9.1
8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.6

Otherwise Unclassified Properties

Density, g/cm3 4.5
22

Common Calculations

Stiffness to Weight: Axial, points 13
5.7
Stiffness to Weight: Bending, points 35
9.3
Strength to Weight: Axial, points 44
7.1 to 9.3
Strength to Weight: Bending, points 39
6.9 to 8.3
Thermal Shock Resistance, points 52
21 to 28

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.1
0
Hydrogen (H), % 0 to 0.015
0
Iridium (Ir), % 0
14.5 to 15.5
Iron (Fe), % 0 to 0.25
0
Nickel (Ni), % 0 to 0.050
0
Oxygen (O), % 0 to 0.15
0
Palladium (Pd), % 0.040 to 0.080
0
Platinum (Pt), % 0
84.3 to 85.5
Titanium (Ti), % 92.5 to 95.5
0
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0
0 to 0.2