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7021 Aluminum vs. 6065 Aluminum

Both 7021 aluminum and 6065 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 7021 aluminum and the bottom bar is 6065 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition


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