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Grade Ti-Pd18 Titanium vs. Grade Ti-Pd8A Titanium

Both grade Ti-Pd18 titanium and grade Ti-Pd8A titanium are titanium alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a moderately high 95% of their average alloy composition in common.

For each property being compared, the top bar is grade Ti-Pd18 titanium and the bottom bar is grade Ti-Pd8A titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 320
200
Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 17
13
Fatigue Strength, MPa 350
260
Poisson's Ratio 0.32
0.32
Rockwell C Hardness 34
21
Shear Modulus, GPa 40
40
Tensile Strength: Ultimate (UTS), MPa 710
500
Tensile Strength: Yield (Proof), MPa 540
430

Thermal Properties

Latent Heat of Fusion, J/g 410
420
Maximum Temperature: Mechanical, °C 330
320
Melting Completion (Liquidus), °C 1640
1660
Melting Onset (Solidus), °C 1590
1610
Specific Heat Capacity, J/kg-K 550
540
Thermal Conductivity, W/m-K 8.2
21
Thermal Expansion, µm/m-K 9.1
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
3.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
6.9

Otherwise Unclassified Properties

Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 41
49
Embodied Energy, MJ/kg 670
840
Embodied Water, L/kg 270
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
65
Resilience: Unit (Modulus of Resilience), kJ/m3 1380
880
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 44
31
Strength to Weight: Bending, points 39
31
Thermal Diffusivity, mm2/s 3.3
8.6
Thermal Shock Resistance, points 52
39

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.1
0 to 0.1
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 0 to 0.25
0 to 0.25
Nickel (Ni), % 0 to 0.050
0 to 0.050
Oxygen (O), % 0 to 0.15
0 to 0.4
Palladium (Pd), % 0.040 to 0.080
0.12 to 0.3
Titanium (Ti), % 92.5 to 95.5
98.8 to 99.9
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0
0 to 0.4