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3105 Aluminum vs. Grade 18 Titanium

3105 aluminum belongs to the aluminum alloys classification, while grade 18 titanium belongs to the titanium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is 3105 aluminum and the bottom bar is grade 18 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
110
Elongation at Break, % 1.1 to 20
11 to 17
Fatigue Strength, MPa 39 to 95
330 to 480
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
40
Shear Strength, MPa 77 to 140
420 to 590
Tensile Strength: Ultimate (UTS), MPa 120 to 240
690 to 980
Tensile Strength: Yield (Proof), MPa 46 to 220
540 to 810

Thermal Properties

Latent Heat of Fusion, J/g 400
410
Maximum Temperature: Mechanical, °C 180
330
Melting Completion (Liquidus), °C 660
1640
Melting Onset (Solidus), °C 640
1590
Specific Heat Capacity, J/kg-K 900
550
Thermal Conductivity, W/m-K 170
8.3
Thermal Expansion, µm/m-K 24
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
1.3
Electrical Conductivity: Equal Weight (Specific), % IACS 140
2.7

Otherwise Unclassified Properties

Density, g/cm3 2.8
4.5
Embodied Carbon, kg CO2/kg material 8.2
41
Embodied Energy, MJ/kg 150
670
Embodied Water, L/kg 1180
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.6 to 19
87 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 15 to 340
1380 to 3110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
35
Strength to Weight: Axial, points 12 to 24
43 to 61
Strength to Weight: Bending, points 20 to 31
39 to 49
Thermal Diffusivity, mm2/s 68
3.4
Thermal Shock Resistance, points 5.2 to 11
47 to 67

Alloy Composition

Aluminum (Al), % 96 to 99.5
2.5 to 3.5
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.2
0
Copper (Cu), % 0 to 0.3
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 0.7
0 to 0.25
Magnesium (Mg), % 0.2 to 0.8
0
Manganese (Mn), % 0.3 to 0.8
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.15
Palladium (Pd), % 0
0.040 to 0.080
Silicon (Si), % 0 to 0.6
0
Titanium (Ti), % 0 to 0.1
92.5 to 95.5
Vanadium (V), % 0
2.0 to 3.0
Zinc (Zn), % 0 to 0.4
0
Residuals, % 0
0 to 0.4

Comparable Variants