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6065 Aluminum vs. 7021 Aluminum

Both 6065 aluminum and 7021 aluminum are aluminum alloys. They have a moderately high 94% of their average alloy composition in common.

For each property being compared, the top bar is 6065 aluminum and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
69
Elongation at Break, % 4.5 to 11
9.4
Fatigue Strength, MPa 96 to 110
150
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
26
Shear Strength, MPa 190 to 230
270
Tensile Strength: Ultimate (UTS), MPa 310 to 400
460
Tensile Strength: Yield (Proof), MPa 270 to 380
390

Thermal Properties

Latent Heat of Fusion, J/g 400
380
Maximum Temperature: Mechanical, °C 180
200
Melting Completion (Liquidus), °C 640
630
Melting Onset (Solidus), °C 590
510
Specific Heat Capacity, J/kg-K 890
870
Thermal Conductivity, W/m-K 170
150
Thermal Expansion, µm/m-K 23
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 43
38
Electrical Conductivity: Equal Weight (Specific), % IACS 140
120

Otherwise Unclassified Properties

Base Metal Price, % relative 11
9.5
Density, g/cm3 2.8
2.9
Embodied Carbon, kg CO2/kg material 8.4
8.3
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1200
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17 to 34
41
Resilience: Unit (Modulus of Resilience), kJ/m3 540 to 1040
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 49
47
Strength to Weight: Axial, points 31 to 40
44
Strength to Weight: Bending, points 36 to 43
45
Thermal Diffusivity, mm2/s 67
59
Thermal Shock Resistance, points 14 to 18
20

Alloy Composition

Aluminum (Al), % 94.4 to 98.2
90.7 to 93.7
Bismuth (Bi), % 0.5 to 1.5
0
Chromium (Cr), % 0 to 0.15
0 to 0.050
Copper (Cu), % 0.15 to 0.4
0 to 0.25
Iron (Fe), % 0 to 0.7
0 to 0.4
Lead (Pb), % 0 to 0.050
0
Magnesium (Mg), % 0.8 to 1.2
1.2 to 1.8
Manganese (Mn), % 0 to 0.15
0 to 0.1
Silicon (Si), % 0.4 to 0.8
0 to 0.25
Titanium (Ti), % 0 to 0.1
0 to 0.1
Zinc (Zn), % 0 to 0.25
5.0 to 6.0
Zirconium (Zr), % 0 to 0.15
0.080 to 0.18
Residuals, % 0
0 to 0.15