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7021 Aluminum vs. Grade 7 Titanium

7021 aluminum belongs to the aluminum alloys classification, while grade 7 titanium belongs to the titanium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is grade 7 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
110
Elongation at Break, % 9.4
24
Fatigue Strength, MPa 150
250
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 26
38
Shear Strength, MPa 270
270
Tensile Strength: Ultimate (UTS), MPa 460
420
Tensile Strength: Yield (Proof), MPa 390
340

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
22
Thermal Expansion, µm/m-K 24
9.2

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 120
7.2

Otherwise Unclassified Properties

Density, g/cm3 2.9
4.5
Embodied Carbon, kg CO2/kg material 8.3
47
Embodied Energy, MJ/kg 150
800
Embodied Water, L/kg 1140
470

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
95
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
560
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
35
Strength to Weight: Axial, points 44
26
Strength to Weight: Bending, points 45
28
Thermal Diffusivity, mm2/s 59
8.9
Thermal Shock Resistance, points 20
31

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 0.3
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 0.25
Palladium (Pd), % 0
0.12 to 0.25
Silicon (Si), % 0 to 0.25
0
Titanium (Ti), % 0 to 0.1
98.7 to 99.88
Zinc (Zn), % 5.0 to 6.0
0
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0
0 to 0.4