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Grade 21 Titanium vs. Grade Ti-Pd18 Titanium

Both grade 21 titanium and grade Ti-Pd18 titanium are titanium alloys. They have 82% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is grade 21 titanium and the bottom bar is grade Ti-Pd18 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
110
Elongation at Break, % 9.0 to 17
17
Fatigue Strength, MPa 550 to 660
350
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 51
40
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
710
Tensile Strength: Yield (Proof), MPa 870 to 1170
540

Thermal Properties

Latent Heat of Fusion, J/g 410
410
Maximum Temperature: Mechanical, °C 310
330
Melting Completion (Liquidus), °C 1740
1640
Melting Onset (Solidus), °C 1690
1590
Specific Heat Capacity, J/kg-K 500
550
Thermal Conductivity, W/m-K 7.5
8.2
Thermal Expansion, µm/m-K 7.1
9.1

Otherwise Unclassified Properties

Density, g/cm3 5.4
4.5
Embodied Carbon, kg CO2/kg material 32
41
Embodied Energy, MJ/kg 490
670
Embodied Water, L/kg 180
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
110
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
1380
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 32
35
Strength to Weight: Axial, points 46 to 69
44
Strength to Weight: Bending, points 38 to 50
39
Thermal Diffusivity, mm2/s 2.8
3.3
Thermal Shock Resistance, points 66 to 100
52

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
2.5 to 3.5
Carbon (C), % 0 to 0.050
0 to 0.1
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 0 to 0.4
0 to 0.25
Molybdenum (Mo), % 14 to 16
0
Nickel (Ni), % 0
0 to 0.050
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0 to 0.15
Palladium (Pd), % 0
0.040 to 0.080
Silicon (Si), % 0.15 to 0.25
0
Titanium (Ti), % 76 to 81.2
92.5 to 95.5
Vanadium (V), % 0
2.0 to 3.0
Residuals, % 0
0 to 0.4