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Grade 20 Titanium vs. 2218 Aluminum

Grade 20 titanium belongs to the titanium alloys classification, while 2218 aluminum belongs to the aluminum alloys. There are 25 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 20 titanium and the bottom bar is 2218 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
73
Elongation at Break, % 5.7 to 17
6.8 to 10
Fatigue Strength, MPa 550 to 630
110
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 47
27
Shear Strength, MPa 560 to 740
210 to 250
Tensile Strength: Ultimate (UTS), MPa 900 to 1270
330 to 430
Tensile Strength: Yield (Proof), MPa 850 to 1190
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 400
390
Maximum Temperature: Mechanical, °C 370
220
Melting Completion (Liquidus), °C 1660
640
Melting Onset (Solidus), °C 1600
510
Specific Heat Capacity, J/kg-K 520
870
Thermal Expansion, µm/m-K 9.6
22

Otherwise Unclassified Properties

Density, g/cm3 5.0
3.1
Embodied Carbon, kg CO2/kg material 52
8.2
Embodied Energy, MJ/kg 860
150
Embodied Water, L/kg 350
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 150
27 to 31
Resilience: Unit (Modulus of Resilience), kJ/m3 2940 to 5760
450 to 650
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 33
45
Strength to Weight: Axial, points 50 to 70
30 to 39
Strength to Weight: Bending, points 41 to 52
34 to 41
Thermal Shock Resistance, points 55 to 77
15 to 19

Alloy Composition

Aluminum (Al), % 3.0 to 4.0
88.8 to 93.6
Carbon (C), % 0 to 0.050
0
Chromium (Cr), % 5.5 to 6.5
0 to 0.1
Copper (Cu), % 0
3.5 to 4.5
Hydrogen (H), % 0 to 0.020
0
Iron (Fe), % 0 to 0.3
0 to 1.0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0
0 to 0.2
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 0
1.7 to 2.3
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.12
0
Palladium (Pd), % 0.040 to 0.080
0
Silicon (Si), % 0
0 to 0.9
Titanium (Ti), % 71 to 77
0
Vanadium (V), % 7.5 to 8.5
0
Zinc (Zn), % 0
0 to 0.25
Zirconium (Zr), % 3.5 to 4.5
0
Residuals, % 0
0 to 0.15

Comparable Variants