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Grade 20 Titanium vs. 7021 Aluminum

Grade 20 titanium belongs to the titanium alloys classification, while 7021 aluminum belongs to the aluminum alloys. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is grade 20 titanium and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
69
Elongation at Break, % 5.7 to 17
9.4
Fatigue Strength, MPa 550 to 630
150
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 47
26
Shear Strength, MPa 560 to 740
270
Tensile Strength: Ultimate (UTS), MPa 900 to 1270
460
Tensile Strength: Yield (Proof), MPa 850 to 1190
390

Thermal Properties

Latent Heat of Fusion, J/g 400
380
Maximum Temperature: Mechanical, °C 370
200
Melting Completion (Liquidus), °C 1660
630
Melting Onset (Solidus), °C 1600
510
Specific Heat Capacity, J/kg-K 520
870
Thermal Expansion, µm/m-K 9.6
24

Otherwise Unclassified Properties

Density, g/cm3 5.0
2.9
Embodied Carbon, kg CO2/kg material 52
8.3
Embodied Energy, MJ/kg 860
150
Embodied Water, L/kg 350
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 150
41
Resilience: Unit (Modulus of Resilience), kJ/m3 2940 to 5760
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 33
47
Strength to Weight: Axial, points 50 to 70
44
Strength to Weight: Bending, points 41 to 52
45
Thermal Shock Resistance, points 55 to 77
20

Alloy Composition

Aluminum (Al), % 3.0 to 4.0
90.7 to 93.7
Carbon (C), % 0 to 0.050
0
Chromium (Cr), % 5.5 to 6.5
0 to 0.050
Copper (Cu), % 0
0 to 0.25
Hydrogen (H), % 0 to 0.020
0
Iron (Fe), % 0 to 0.3
0 to 0.4
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0
0 to 0.1
Molybdenum (Mo), % 3.5 to 4.5
0
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 0.25
Titanium (Ti), % 71 to 77
0 to 0.1
Vanadium (V), % 7.5 to 8.5
0
Zinc (Zn), % 0
5.0 to 6.0
Zirconium (Zr), % 3.5 to 4.5
0.080 to 0.18
Residuals, % 0
0 to 0.15