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6081 Aluminum vs. 6066 Aluminum

Both 6081 aluminum and 6066 aluminum are aluminum alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is 6081 aluminum and the bottom bar is 6066 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
70
Elongation at Break, % 9.0
7.8 to 17
Fatigue Strength, MPa 110
94 to 130
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
26
Shear Strength, MPa 180
95 to 240
Tensile Strength: Ultimate (UTS), MPa 310
160 to 400
Tensile Strength: Yield (Proof), MPa 270
93 to 360

Thermal Properties

Latent Heat of Fusion, J/g 410
410
Maximum Temperature: Mechanical, °C 160
170
Melting Completion (Liquidus), °C 640
650
Melting Onset (Solidus), °C 610
560
Specific Heat Capacity, J/kg-K 900
890
Thermal Conductivity, W/m-K 180
150
Thermal Expansion, µm/m-K 23
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 47
40
Electrical Conductivity: Equal Weight (Specific), % IACS 160
130

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.7
2.8
Embodied Carbon, kg CO2/kg material 8.3
8.3
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
23 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 540
61 to 920
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
49
Strength to Weight: Axial, points 32
16 to 39
Strength to Weight: Bending, points 37
23 to 43
Thermal Diffusivity, mm2/s 74
61
Thermal Shock Resistance, points 14
6.9 to 17

Alloy Composition

Aluminum (Al), % 96.3 to 98.6
93 to 97
Chromium (Cr), % 0 to 0.1
0 to 0.4
Copper (Cu), % 0 to 0.1
0.7 to 1.2
Iron (Fe), % 0 to 0.5
0 to 0.5
Magnesium (Mg), % 0.6 to 1.0
0.8 to 1.4
Manganese (Mn), % 0.1 to 0.45
0.6 to 1.1
Silicon (Si), % 0.7 to 1.1
0.9 to 1.8
Titanium (Ti), % 0 to 0.15
0 to 0.2
Zinc (Zn), % 0 to 0.2
0 to 0.25
Residuals, % 0
0 to 0.15