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Grade 27 Titanium vs. 7178 Aluminum

Grade 27 titanium belongs to the titanium alloys classification, while 7178 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is grade 27 titanium and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
71
Elongation at Break, % 27
4.5 to 12
Fatigue Strength, MPa 170
120 to 210
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 41
27
Shear Strength, MPa 180
140 to 380
Tensile Strength: Ultimate (UTS), MPa 270
240 to 640
Tensile Strength: Yield (Proof), MPa 230
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 420
370
Maximum Temperature: Mechanical, °C 320
180
Melting Completion (Liquidus), °C 1660
630
Melting Onset (Solidus), °C 1610
480
Specific Heat Capacity, J/kg-K 540
860
Thermal Conductivity, W/m-K 21
130
Thermal Expansion, µm/m-K 8.7
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
31
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
91

Otherwise Unclassified Properties

Base Metal Price, % relative 37
10
Density, g/cm3 4.5
3.1
Embodied Carbon, kg CO2/kg material 33
8.2
Embodied Energy, MJ/kg 530
150
Embodied Water, L/kg 320
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 240
110 to 2220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
45
Strength to Weight: Axial, points 17
21 to 58
Strength to Weight: Bending, points 21
28 to 54
Thermal Diffusivity, mm2/s 8.8
47
Thermal Shock Resistance, points 21
10 to 28

Alloy Composition

Aluminum (Al), % 0
85.4 to 89.5
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 0
0.18 to 0.28
Copper (Cu), % 0
1.6 to 2.4
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
0 to 0.5
Magnesium (Mg), % 0
2.4 to 3.1
Manganese (Mn), % 0
0 to 0.3
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
0 to 0.4
Titanium (Ti), % 99 to 99.92
0 to 0.2
Zinc (Zn), % 0
6.3 to 7.3
Residuals, % 0
0 to 0.15