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Grade 20 Titanium vs. 4145 Aluminum

Grade 20 titanium belongs to the titanium alloys classification, while 4145 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 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
73
Elongation at Break, % 5.7 to 17
2.2
Fatigue Strength, MPa 550 to 630
48
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 47
28
Shear Strength, MPa 560 to 740
69
Tensile Strength: Ultimate (UTS), MPa 900 to 1270
120
Tensile Strength: Yield (Proof), MPa 850 to 1190
68

Thermal Properties

Latent Heat of Fusion, J/g 400
540
Maximum Temperature: Mechanical, °C 370
160
Melting Completion (Liquidus), °C 1660
590
Melting Onset (Solidus), °C 1600
520
Specific Heat Capacity, J/kg-K 520
880
Thermal Expansion, µm/m-K 9.6
21

Otherwise Unclassified Properties

Density, g/cm3 5.0
2.8
Embodied Carbon, kg CO2/kg material 52
7.6
Embodied Energy, MJ/kg 860
140
Embodied Water, L/kg 350
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 150
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 2940 to 5760
31
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 33
50
Strength to Weight: Axial, points 50 to 70
12
Strength to Weight: Bending, points 41 to 52
19
Thermal Shock Resistance, points 55 to 77
5.5

Alloy Composition

Aluminum (Al), % 3.0 to 4.0
83 to 87.4
Carbon (C), % 0 to 0.050
0
Chromium (Cr), % 5.5 to 6.5
0 to 0.15
Copper (Cu), % 0
3.3 to 4.7
Hydrogen (H), % 0 to 0.020
0
Iron (Fe), % 0 to 0.3
0 to 0.8
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0
0 to 0.15
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
9.3 to 10.7
Titanium (Ti), % 71 to 77
0
Vanadium (V), % 7.5 to 8.5
0
Zinc (Zn), % 0
0 to 0.2
Zirconium (Zr), % 3.5 to 4.5
0
Residuals, % 0
0 to 0.15