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Grade 21 Titanium vs. 7075 Aluminum

Grade 21 titanium belongs to the titanium alloys classification, while 7075 aluminum belongs to the aluminum 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 grade 21 titanium and the bottom bar is 7075 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
70
Elongation at Break, % 9.0 to 17
1.8 to 12
Fatigue Strength, MPa 550 to 660
110 to 190
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 51
26
Shear Strength, MPa 550 to 790
150 to 340
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
240 to 590
Tensile Strength: Yield (Proof), MPa 870 to 1170
120 to 510

Thermal Properties

Latent Heat of Fusion, J/g 410
380
Maximum Temperature: Mechanical, °C 310
200
Melting Completion (Liquidus), °C 1740
640
Melting Onset (Solidus), °C 1690
480
Specific Heat Capacity, J/kg-K 500
870
Thermal Conductivity, W/m-K 7.5
130
Thermal Expansion, µm/m-K 7.1
23

Otherwise Unclassified Properties

Base Metal Price, % relative 60
10
Density, g/cm3 5.4
3.0
Embodied Carbon, kg CO2/kg material 32
8.3
Embodied Energy, MJ/kg 490
150
Embodied Water, L/kg 180
1120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
7.8 to 44
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
110 to 1870
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 32
46
Strength to Weight: Axial, points 46 to 69
22 to 54
Strength to Weight: Bending, points 38 to 50
28 to 52
Thermal Diffusivity, mm2/s 2.8
50
Thermal Shock Resistance, points 66 to 100
10 to 25

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
86.9 to 91.4
Carbon (C), % 0 to 0.050
0
Chromium (Cr), % 0
0.18 to 0.28
Copper (Cu), % 0
1.2 to 2.0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
0 to 0.5
Magnesium (Mg), % 0
2.1 to 2.9
Manganese (Mn), % 0
0 to 0.3
Molybdenum (Mo), % 14 to 16
0
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0
Silicon (Si), % 0.15 to 0.25
0 to 0.4
Titanium (Ti), % 76 to 81.2
0 to 0.2
Zinc (Zn), % 0
5.1 to 6.1
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0 to 0.4
0 to 0.15

Comparable Variants