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Grade 6 Titanium vs. 7021 Aluminum

Grade 6 titanium belongs to the titanium alloys classification, while 7021 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is grade 6 titanium and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
69
Elongation at Break, % 11
9.4
Fatigue Strength, MPa 290
150
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 39
26
Shear Strength, MPa 530
270
Tensile Strength: Ultimate (UTS), MPa 890
460
Tensile Strength: Yield (Proof), MPa 840
390

Thermal Properties

Latent Heat of Fusion, J/g 410
380
Maximum Temperature: Mechanical, °C 310
200
Melting Completion (Liquidus), °C 1580
630
Melting Onset (Solidus), °C 1530
510
Specific Heat Capacity, J/kg-K 550
870
Thermal Conductivity, W/m-K 7.8
150
Thermal Expansion, µm/m-K 9.4
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
38
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
120

Otherwise Unclassified Properties

Base Metal Price, % relative 36
9.5
Density, g/cm3 4.5
2.9
Embodied Carbon, kg CO2/kg material 30
8.3
Embodied Energy, MJ/kg 480
150
Embodied Water, L/kg 190
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 92
41
Resilience: Unit (Modulus of Resilience), kJ/m3 3390
1110
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
47
Strength to Weight: Axial, points 55
44
Strength to Weight: Bending, points 46
45
Thermal Diffusivity, mm2/s 3.2
59
Thermal Shock Resistance, points 65
20

Alloy Composition

Aluminum (Al), % 4.0 to 6.0
90.7 to 93.7
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 0
0 to 0.050
Copper (Cu), % 0
0 to 0.25
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.5
0 to 0.4
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0
0 to 0.1
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.2
0
Silicon (Si), % 0
0 to 0.25
Tin (Sn), % 2.0 to 3.0
0
Titanium (Ti), % 89.8 to 94
0 to 0.1
Zinc (Zn), % 0
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15