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Grade 6 Titanium vs. 7178 Aluminum

Grade 6 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 6 titanium and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
71
Elongation at Break, % 11
4.5 to 12
Fatigue Strength, MPa 290
120 to 210
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 39
27
Shear Strength, MPa 530
140 to 380
Tensile Strength: Ultimate (UTS), MPa 890
240 to 640
Tensile Strength: Yield (Proof), MPa 840
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 410
370
Maximum Temperature: Mechanical, °C 310
180
Melting Completion (Liquidus), °C 1580
630
Melting Onset (Solidus), °C 1530
480
Specific Heat Capacity, J/kg-K 550
860
Thermal Conductivity, W/m-K 7.8
130
Thermal Expansion, µm/m-K 9.4
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
31
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
91

Otherwise Unclassified Properties

Base Metal Price, % relative 36
10
Density, g/cm3 4.5
3.1
Embodied Carbon, kg CO2/kg material 30
8.2
Embodied Energy, MJ/kg 480
150
Embodied Water, L/kg 190
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 92
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 3390
110 to 2220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
45
Strength to Weight: Axial, points 55
21 to 58
Strength to Weight: Bending, points 46
28 to 54
Thermal Diffusivity, mm2/s 3.2
47
Thermal Shock Resistance, points 65
10 to 28

Alloy Composition

Aluminum (Al), % 4.0 to 6.0
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 0.5
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 0.2
0
Silicon (Si), % 0
0 to 0.4
Tin (Sn), % 2.0 to 3.0
0
Titanium (Ti), % 89.8 to 94
0 to 0.2
Zinc (Zn), % 0
6.3 to 7.3
Residuals, % 0 to 0.4
0 to 0.15