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7021 Aluminum vs. Grade 27 Titanium

7021 aluminum belongs to the aluminum alloys classification, while grade 27 titanium belongs to the titanium 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 7021 aluminum and the bottom bar is grade 27 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
110
Elongation at Break, % 9.4
27
Fatigue Strength, MPa 150
170
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 26
41
Shear Strength, MPa 270
180
Tensile Strength: Ultimate (UTS), MPa 460
270
Tensile Strength: Yield (Proof), MPa 390
230

Thermal Properties

Latent Heat of Fusion, J/g 380
420
Maximum Temperature: Mechanical, °C 200
320
Melting Completion (Liquidus), °C 630
1660
Melting Onset (Solidus), °C 510
1610
Specific Heat Capacity, J/kg-K 870
540
Thermal Conductivity, W/m-K 150
21
Thermal Expansion, µm/m-K 24
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 120
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
37
Density, g/cm3 2.9
4.5
Embodied Carbon, kg CO2/kg material 8.3
33
Embodied Energy, MJ/kg 150
530
Embodied Water, L/kg 1140
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
70
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
240
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
35
Strength to Weight: Axial, points 44
17
Strength to Weight: Bending, points 45
21
Thermal Diffusivity, mm2/s 59
8.8
Thermal Shock Resistance, points 20
21

Alloy Composition

Aluminum (Al), % 90.7 to 93.7
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.050
0
Copper (Cu), % 0 to 0.25
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 0.4
0 to 0.2
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.1
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.18
Ruthenium (Ru), % 0
0.080 to 0.14
Silicon (Si), % 0 to 0.25
0
Titanium (Ti), % 0 to 0.1
99 to 99.92
Zinc (Zn), % 5.0 to 6.0
0
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0
0 to 0.4