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Grade 21 Titanium vs. Titanium 6-7

Both grade 21 titanium and titanium 6-7 are titanium alloys. They have a moderately high 92% of their average alloy composition in common. There are 27 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 21 titanium and the bottom bar is titanium 6-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
120
Elongation at Break, % 9.0 to 17
11
Fatigue Strength, MPa 550 to 660
530
Poisson's Ratio 0.32
0.33
Reduction in Area, % 22
29
Shear Modulus, GPa 51
45
Shear Strength, MPa 550 to 790
610
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
1020
Tensile Strength: Yield (Proof), MPa 870 to 1170
900

Thermal Properties

Latent Heat of Fusion, J/g 410
410
Maximum Temperature: Mechanical, °C 310
300
Melting Completion (Liquidus), °C 1740
1700
Melting Onset (Solidus), °C 1690
1650
Specific Heat Capacity, J/kg-K 500
520
Thermal Expansion, µm/m-K 7.1
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 60
75
Density, g/cm3 5.4
5.1
Embodied Carbon, kg CO2/kg material 32
34
Embodied Energy, MJ/kg 490
540
Embodied Water, L/kg 180
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
110
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
3460
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 32
32
Strength to Weight: Axial, points 46 to 69
56
Strength to Weight: Bending, points 38 to 50
44
Thermal Shock Resistance, points 66 to 100
66

Alloy Composition


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Aluminum (Al), % 2.5 to 3.5
5.5 to 6.5
Carbon (C), % 0 to 0.050
0 to 0.080
Hydrogen (H), % 0 to 0.015
0 to 0.0090
Iron (Fe), % 0 to 0.4
0 to 0.25
Molybdenum (Mo), % 14 to 16
6.5 to 7.5
Niobium (Nb), % 2.2 to 3.2
6.5 to 7.5
Nitrogen (N), % 0 to 0.030
0 to 0.050
Oxygen (O), % 0 to 0.17
0 to 0.2
Silicon (Si), % 0.15 to 0.25
0
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 76 to 81.2
84.9 to 88
Residuals, % 0 to 0.4
0