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8021 Aluminum vs. Grade 6 Titanium

8021 aluminum belongs to the aluminum alloys classification, while grade 6 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 8021 aluminum and the bottom bar is grade 6 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
100
Elongation at Break, % 2.3
11
Fatigue Strength, MPa 61
290
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
39
Tensile Strength: Ultimate (UTS), MPa 160
890
Tensile Strength: Yield (Proof), MPa 130
840

Thermal Properties

Latent Heat of Fusion, J/g 400
410
Maximum Temperature: Mechanical, °C 170
310
Melting Completion (Liquidus), °C 650
1580
Melting Onset (Solidus), °C 640
1530
Specific Heat Capacity, J/kg-K 900
550
Thermal Conductivity, W/m-K 220
7.8
Thermal Expansion, µm/m-K 23
9.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
1.2
Electrical Conductivity: Equal Weight (Specific), % IACS 180
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
36
Density, g/cm3 2.8
4.5
Embodied Carbon, kg CO2/kg material 8.1
30
Embodied Energy, MJ/kg 150
480
Embodied Water, L/kg 1180
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.4
92
Resilience: Unit (Modulus of Resilience), kJ/m3 130
3390
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 49
35
Strength to Weight: Axial, points 16
55
Strength to Weight: Bending, points 23
46
Thermal Diffusivity, mm2/s 88
3.2
Thermal Shock Resistance, points 7.0
65

Alloy Composition


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Aluminum (Al), % 98 to 98.8
4.0 to 6.0
Carbon (C), % 0
0 to 0.080
Copper (Cu), % 0 to 0.050
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 1.2 to 1.7
0 to 0.5
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.2
Silicon (Si), % 0 to 0.15
0
Tin (Sn), % 0
2.0 to 3.0
Titanium (Ti), % 0
89.8 to 94
Residuals, % 0 to 0.15
0 to 0.4