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7178 Aluminum vs. Grade C-5 Titanium

7178 aluminum belongs to the aluminum alloys classification, while grade C-5 titanium belongs to the titanium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is 7178 aluminum and the bottom bar is grade C-5 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
110
Elongation at Break, % 4.5 to 12
6.7
Fatigue Strength, MPa 120 to 210
510
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 27
40
Tensile Strength: Ultimate (UTS), MPa 240 to 640
1000
Tensile Strength: Yield (Proof), MPa 120 to 560
940

Thermal Properties

Latent Heat of Fusion, J/g 370
410
Maximum Temperature: Mechanical, °C 180
340
Melting Completion (Liquidus), °C 630
1610
Melting Onset (Solidus), °C 480
1560
Specific Heat Capacity, J/kg-K 860
560
Thermal Conductivity, W/m-K 130
7.1
Thermal Expansion, µm/m-K 23
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 91
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 10
36
Density, g/cm3 3.1
4.4
Embodied Carbon, kg CO2/kg material 8.2
38
Embodied Energy, MJ/kg 150
610
Embodied Water, L/kg 1110
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
66
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
4200
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
35
Strength to Weight: Axial, points 21 to 58
63
Strength to Weight: Bending, points 28 to 54
50
Thermal Diffusivity, mm2/s 47
2.9
Thermal Shock Resistance, points 10 to 28
71

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
5.5 to 6.8
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 0.5
0 to 0.4
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0
Nickel (Ni), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.25
Silicon (Si), % 0 to 0.4
0
Titanium (Ti), % 0 to 0.2
87.5 to 91
Vanadium (V), % 0
3.5 to 4.5
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0
0 to 0.4