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7021 Aluminum vs. Grade 25 Titanium

7021 aluminum belongs to the aluminum alloys classification, while grade 25 titanium belongs to the titanium alloys. There are 29 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 25 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
110
Elongation at Break, % 9.4
11
Fatigue Strength, MPa 150
550
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 26
40
Shear Strength, MPa 270
600
Tensile Strength: Ultimate (UTS), MPa 460
1000
Tensile Strength: Yield (Proof), MPa 390
940

Thermal Properties

Latent Heat of Fusion, J/g 380
410
Maximum Temperature: Mechanical, °C 200
340
Melting Completion (Liquidus), °C 630
1610
Melting Onset (Solidus), °C 510
1560
Specific Heat Capacity, J/kg-K 870
560
Thermal Conductivity, W/m-K 150
7.1
Thermal Expansion, µm/m-K 24
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.0

Otherwise Unclassified Properties

Density, g/cm3 2.9
4.5
Embodied Carbon, kg CO2/kg material 8.3
43
Embodied Energy, MJ/kg 150
700
Embodied Water, L/kg 1140
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
4220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
35
Strength to Weight: Axial, points 44
62
Strength to Weight: Bending, points 45
50
Thermal Diffusivity, mm2/s 59
2.8
Thermal Shock Resistance, points 20
71

Alloy Composition

Aluminum (Al), % 90.7 to 93.7
5.5 to 6.8
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 0.013
Iron (Fe), % 0 to 0.4
0 to 0.4
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.1
0
Nickel (Ni), % 0
0.3 to 0.8
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.2
Palladium (Pd), % 0
0.040 to 0.080
Silicon (Si), % 0 to 0.25
0
Titanium (Ti), % 0 to 0.1
86.7 to 90.6
Vanadium (V), % 0
3.5 to 4.5
Zinc (Zn), % 5.0 to 6.0
0
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0
0 to 0.4