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Grade 38 Titanium vs. 90-platinum 10-iridium

Grade 38 titanium belongs to the titanium alloys classification, while 90-platinum 10-iridium belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (16, 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 38 titanium and the bottom bar is 90-platinum 10-iridium.

Grade 38 (R54250) Titanium90-Platinum 10-Iridium Electrical Contact Alloy
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 11
5.5 to 34
Poisson's Ratio 0.32
0.38
Shear Modulus, GPa 40
74
Shear Strength, MPa 600
220 to 320
Tensile Strength: Ultimate (UTS), MPa 1000
330 to 550

Thermal Properties

Latent Heat of Fusion, J/g 410
100
Specific Heat Capacity, J/kg-K 550
130
Thermal Expansion, µm/m-K 9.3
8.6

Otherwise Unclassified Properties

Density, g/cm3 4.5
22

Common Calculations

Stiffness to Weight: Axial, points 13
5.3
Stiffness to Weight: Bending, points 35
9.1
Strength to Weight: Axial, points 62
4.2 to 7.1
Strength to Weight: Bending, points 49
4.9 to 6.9
Thermal Shock Resistance, points 72
13 to 22

Alloy Composition

Aluminum (Al), % 3.5 to 4.5
0
Carbon (C), % 0 to 0.080
0
Hydrogen (H), % 0 to 0.015
0
Iridium (Ir), % 0
9.5 to 10.5
Iron (Fe), % 1.2 to 1.8
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0.2 to 0.3
0
Platinum (Pt), % 0
89.3 to 90.5
Titanium (Ti), % 89.9 to 93.1
0
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0
0 to 0.2