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Grade 27 Titanium vs. 2117 Aluminum

Grade 27 titanium belongs to the titanium alloys classification, while 2117 aluminum belongs to the aluminum alloys. 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 27 titanium and the bottom bar is 2117 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
71
Elongation at Break, % 27
26
Fatigue Strength, MPa 170
95
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 41
27
Shear Strength, MPa 180
200
Tensile Strength: Ultimate (UTS), MPa 270
300
Tensile Strength: Yield (Proof), MPa 230
170

Thermal Properties

Latent Heat of Fusion, J/g 420
400
Maximum Temperature: Mechanical, °C 320
220
Melting Completion (Liquidus), °C 1660
650
Melting Onset (Solidus), °C 1610
550
Specific Heat Capacity, J/kg-K 540
880
Thermal Conductivity, W/m-K 21
150
Thermal Expansion, µm/m-K 8.7
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
40
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
120

Otherwise Unclassified Properties

Base Metal Price, % relative 37
10
Density, g/cm3 4.5
3.0
Embodied Carbon, kg CO2/kg material 33
8.2
Embodied Energy, MJ/kg 530
150
Embodied Water, L/kg 320
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
64
Resilience: Unit (Modulus of Resilience), kJ/m3 240
190
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
47
Strength to Weight: Axial, points 17
28
Strength to Weight: Bending, points 21
33
Thermal Diffusivity, mm2/s 8.8
59
Thermal Shock Resistance, points 21
12

Alloy Composition

Aluminum (Al), % 0
91 to 97.6
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0
2.2 to 4.5
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
0 to 0.7
Magnesium (Mg), % 0
0.2 to 1.0
Manganese (Mn), % 0
0.4 to 1.0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0.2 to 0.8
Titanium (Ti), % 99 to 99.92
0 to 0.25
Zinc (Zn), % 0
0 to 0.25
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15