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7108 Aluminum vs. Grade 20 Titanium

7108 aluminum belongs to the aluminum alloys classification, while grade 20 titanium belongs to the titanium 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 7108 aluminum and the bottom bar is grade 20 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
120
Elongation at Break, % 11
5.7 to 17
Fatigue Strength, MPa 120
550 to 630
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
47
Shear Strength, MPa 210
560 to 740
Tensile Strength: Ultimate (UTS), MPa 350
900 to 1270
Tensile Strength: Yield (Proof), MPa 290
850 to 1190

Thermal Properties

Latent Heat of Fusion, J/g 380
400
Maximum Temperature: Mechanical, °C 210
370
Melting Completion (Liquidus), °C 630
1660
Melting Onset (Solidus), °C 530
1600
Specific Heat Capacity, J/kg-K 880
520
Thermal Expansion, µm/m-K 24
9.6

Otherwise Unclassified Properties

Density, g/cm3 2.9
5.0
Embodied Carbon, kg CO2/kg material 8.3
52
Embodied Energy, MJ/kg 150
860
Embodied Water, L/kg 1150
350

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 38
71 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 620
2940 to 5760
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
33
Strength to Weight: Axial, points 34
50 to 70
Strength to Weight: Bending, points 38
41 to 52
Thermal Shock Resistance, points 16
55 to 77

Alloy Composition

Aluminum (Al), % 92.4 to 94.7
3.0 to 4.0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
5.5 to 6.5
Copper (Cu), % 0 to 0.050
0
Hydrogen (H), % 0
0 to 0.020
Iron (Fe), % 0 to 0.1
0 to 0.3
Magnesium (Mg), % 0.7 to 1.4
0
Manganese (Mn), % 0 to 0.050
0
Molybdenum (Mo), % 0
3.5 to 4.5
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.12
Palladium (Pd), % 0
0.040 to 0.080
Silicon (Si), % 0 to 0.1
0
Titanium (Ti), % 0 to 0.050
71 to 77
Vanadium (V), % 0
7.5 to 8.5
Zinc (Zn), % 4.5 to 5.5
0
Zirconium (Zr), % 0.12 to 0.25
3.5 to 4.5
Residuals, % 0
0 to 0.4