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7020 Aluminum vs. Grade 21 Titanium

7020 aluminum belongs to the aluminum alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 28 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 7020 aluminum and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
140
Elongation at Break, % 8.4 to 14
9.0 to 17
Fatigue Strength, MPa 110 to 130
550 to 660
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
51
Shear Strength, MPa 110 to 230
550 to 790
Tensile Strength: Ultimate (UTS), MPa 190 to 390
890 to 1340
Tensile Strength: Yield (Proof), MPa 120 to 310
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 380
410
Maximum Temperature: Mechanical, °C 210
310
Melting Completion (Liquidus), °C 650
1740
Melting Onset (Solidus), °C 610
1690
Specific Heat Capacity, J/kg-K 880
500
Thermal Conductivity, W/m-K 150
7.5
Thermal Expansion, µm/m-K 23
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
60
Density, g/cm3 2.9
5.4
Embodied Carbon, kg CO2/kg material 8.3
32
Embodied Energy, MJ/kg 150
490
Embodied Water, L/kg 1150
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 46
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 690
2760 to 5010
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
32
Strength to Weight: Axial, points 18 to 37
46 to 69
Strength to Weight: Bending, points 25 to 41
38 to 50
Thermal Diffusivity, mm2/s 59
2.8
Thermal Shock Resistance, points 8.3 to 17
66 to 100

Alloy Composition

Aluminum (Al), % 91.2 to 94.8
2.5 to 3.5
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0.1 to 0.35
0
Copper (Cu), % 0 to 0.2
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 0.4
0 to 0.4
Magnesium (Mg), % 1.0 to 1.4
0
Manganese (Mn), % 0.050 to 0.5
0
Molybdenum (Mo), % 0
14 to 16
Niobium (Nb), % 0
2.2 to 3.2
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.17
Silicon (Si), % 0 to 0.35
0.15 to 0.25
Titanium (Ti), % 0 to 0.25
76 to 81.2
Zinc (Zn), % 4.0 to 5.0
0
Zirconium (Zr), % 0.080 to 0.25
0
Residuals, % 0
0 to 0.4

Comparable Variants