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Grade 7 Titanium vs. Grade 9 Titanium

Both grade 7 titanium and grade 9 titanium are titanium alloys. They have a moderately high 95% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is grade 7 titanium and the bottom bar is grade 9 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 24
11 to 17
Fatigue Strength, MPa 250
330 to 480
Poisson's Ratio 0.32
0.32
Reduction in Area, % 34
28
Shear Modulus, GPa 38
40
Shear Strength, MPa 270
430 to 580
Tensile Strength: Ultimate (UTS), MPa 420
700 to 960
Tensile Strength: Yield (Proof), MPa 340
540 to 830

Thermal Properties

Latent Heat of Fusion, J/g 420
410
Maximum Temperature: Mechanical, °C 320
330
Melting Completion (Liquidus), °C 1660
1640
Melting Onset (Solidus), °C 1610
1590
Specific Heat Capacity, J/kg-K 540
550
Thermal Conductivity, W/m-K 22
8.1
Thermal Expansion, µm/m-K 9.2
9.1

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 7.2
2.7

Otherwise Unclassified Properties

Density, g/cm3 4.5
4.5
Embodied Carbon, kg CO2/kg material 47
36
Embodied Energy, MJ/kg 800
580
Embodied Water, L/kg 470
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
89 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 560
1380 to 3220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
35
Strength to Weight: Axial, points 26
43 to 60
Strength to Weight: Bending, points 28
39 to 48
Thermal Diffusivity, mm2/s 8.9
3.3
Thermal Shock Resistance, points 31
52 to 71

Alloy Composition


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Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0 to 0.080
0 to 0.080
Hydrogen (H), % 0 to 0.015
0 to 0.015
Iron (Fe), % 0 to 0.3
0 to 0.25
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0 to 0.25
0 to 0.15
Palladium (Pd), % 0.12 to 0.25
0
Titanium (Ti), % 98.7 to 99.88
92.6 to 95.5
Vanadium (V), % 0
2.0 to 3.0
Residuals, % 0 to 0.4
0 to 0.4