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7021 Aluminum vs. Grade 12 Titanium

7021 aluminum belongs to the aluminum alloys classification, while grade 12 titanium belongs to the titanium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is grade 12 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
110
Elongation at Break, % 9.4
21
Fatigue Strength, MPa 150
280
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 26
39
Shear Strength, MPa 270
330
Tensile Strength: Ultimate (UTS), MPa 460
530
Tensile Strength: Yield (Proof), MPa 390
410

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
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
3.3
Electrical Conductivity: Equal Weight (Specific), % IACS 120
6.6

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
31
Embodied Energy, MJ/kg 150
500
Embodied Water, L/kg 1140
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
770
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
35
Strength to Weight: Axial, points 44
32
Strength to Weight: Bending, points 45
32
Thermal Diffusivity, mm2/s 59
8.5
Thermal Shock Resistance, points 20
37

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
Molybdenum (Mo), % 0
0.2 to 0.4
Nickel (Ni), % 0
0.6 to 0.9
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.25
Silicon (Si), % 0 to 0.25
0
Titanium (Ti), % 0 to 0.1
97.6 to 99.2
Zinc (Zn), % 5.0 to 6.0
0
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0
0 to 0.4