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Grade 27 Titanium vs. 705.0 Aluminum

Grade 27 titanium belongs to the titanium alloys classification, while 705.0 aluminum belongs to the aluminum 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 grade 27 titanium and the bottom bar is 705.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
69
Elongation at Break, % 27
8.4 to 10
Fatigue Strength, MPa 170
63 to 98
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 41
26
Tensile Strength: Ultimate (UTS), MPa 270
240 to 260
Tensile Strength: Yield (Proof), MPa 230
130

Thermal Properties

Latent Heat of Fusion, J/g 420
390
Maximum Temperature: Mechanical, °C 320
180
Melting Completion (Liquidus), °C 1660
640
Melting Onset (Solidus), °C 1610
610
Specific Heat Capacity, J/kg-K 540
890
Thermal Conductivity, W/m-K 21
140
Thermal Expansion, µm/m-K 8.7
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
34
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
110

Otherwise Unclassified Properties

Base Metal Price, % relative 37
9.5
Density, g/cm3 4.5
2.8
Embodied Carbon, kg CO2/kg material 33
8.4
Embodied Energy, MJ/kg 530
150
Embodied Water, L/kg 320
1170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
18 to 20
Resilience: Unit (Modulus of Resilience), kJ/m3 240
120 to 130
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
49
Strength to Weight: Axial, points 17
24 to 26
Strength to Weight: Bending, points 21
31 to 32
Thermal Diffusivity, mm2/s 8.8
55
Thermal Shock Resistance, points 21
11

Alloy Composition

Aluminum (Al), % 0
92.3 to 98.6
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 0
0 to 0.4
Copper (Cu), % 0
0 to 0.2
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
0 to 0.8
Magnesium (Mg), % 0
1.4 to 1.8
Manganese (Mn), % 0
0 to 0.6
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 0.2
Titanium (Ti), % 99 to 99.92
0 to 0.25
Zinc (Zn), % 0
0 to 3.3
Residuals, % 0
0 to 0.15