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Grade 27 Titanium vs. 4145 Aluminum

Grade 27 titanium belongs to the titanium alloys classification, while 4145 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 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
73
Elongation at Break, % 27
2.2
Fatigue Strength, MPa 170
48
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 41
28
Shear Strength, MPa 180
69
Tensile Strength: Ultimate (UTS), MPa 270
120
Tensile Strength: Yield (Proof), MPa 230
68

Thermal Properties

Latent Heat of Fusion, J/g 420
540
Maximum Temperature: Mechanical, °C 320
160
Melting Completion (Liquidus), °C 1660
590
Melting Onset (Solidus), °C 1610
520
Specific Heat Capacity, J/kg-K 540
880
Thermal Conductivity, W/m-K 21
100
Thermal Expansion, µm/m-K 8.7
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
26
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
84

Otherwise Unclassified Properties

Base Metal Price, % relative 37
10
Density, g/cm3 4.5
2.8
Embodied Carbon, kg CO2/kg material 33
7.6
Embodied Energy, MJ/kg 530
140
Embodied Water, L/kg 320
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 240
31
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
50
Strength to Weight: Axial, points 17
12
Strength to Weight: Bending, points 21
19
Thermal Diffusivity, mm2/s 8.8
42
Thermal Shock Resistance, points 21
5.5

Alloy Composition

Aluminum (Al), % 0
83 to 87.4
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 0
0 to 0.15
Copper (Cu), % 0
3.3 to 4.7
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
0 to 0.8
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0
0 to 0.15
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
9.3 to 10.7
Titanium (Ti), % 99 to 99.92
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15