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Grade 28 Titanium vs. 7108 Aluminum

Grade 28 titanium belongs to the titanium alloys classification, while 7108 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 28 titanium and the bottom bar is 7108 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
69
Elongation at Break, % 11 to 17
11
Fatigue Strength, MPa 330 to 480
120
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 40
26
Shear Strength, MPa 420 to 590
210
Tensile Strength: Ultimate (UTS), MPa 690 to 980
350
Tensile Strength: Yield (Proof), MPa 540 to 810
290

Thermal Properties

Latent Heat of Fusion, J/g 410
380
Maximum Temperature: Mechanical, °C 330
210
Melting Completion (Liquidus), °C 1640
630
Melting Onset (Solidus), °C 1590
530
Specific Heat Capacity, J/kg-K 550
880
Thermal Conductivity, W/m-K 8.3
150
Thermal Expansion, µm/m-K 9.9
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.3
39
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
120

Otherwise Unclassified Properties

Base Metal Price, % relative 36
9.5
Density, g/cm3 4.5
2.9
Embodied Carbon, kg CO2/kg material 37
8.3
Embodied Energy, MJ/kg 600
150
Embodied Water, L/kg 370
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 110
38
Resilience: Unit (Modulus of Resilience), kJ/m3 1370 to 3100
620
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
47
Strength to Weight: Axial, points 43 to 61
34
Strength to Weight: Bending, points 39 to 49
38
Thermal Diffusivity, mm2/s 3.4
59
Thermal Shock Resistance, points 47 to 66
16

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
92.4 to 94.7
Carbon (C), % 0 to 0.080
0
Copper (Cu), % 0
0 to 0.050
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
0 to 0.1
Magnesium (Mg), % 0
0.7 to 1.4
Manganese (Mn), % 0
0 to 0.050
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.15
0
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0 to 0.1
Titanium (Ti), % 92.4 to 95.4
0 to 0.050
Vanadium (V), % 2.0 to 3.0
0
Zinc (Zn), % 0
4.5 to 5.5
Zirconium (Zr), % 0
0.12 to 0.25
Residuals, % 0
0 to 0.15