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7021 Aluminum vs. 6351 Aluminum

Both 7021 aluminum and 6351 aluminum are aluminum alloys. They have a moderately high 93% of their average alloy composition in common.

For each property being compared, the top bar is 7021 aluminum and the bottom bar is 6351 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
69
Elongation at Break, % 9.4
7.8 to 18
Fatigue Strength, MPa 150
79 to 130
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 26
26
Shear Strength, MPa 270
84 to 200
Tensile Strength: Ultimate (UTS), MPa 460
140 to 310
Tensile Strength: Yield (Proof), MPa 390
95 to 270

Thermal Properties

Latent Heat of Fusion, J/g 380
410
Maximum Temperature: Mechanical, °C 200
160
Melting Completion (Liquidus), °C 630
650
Melting Onset (Solidus), °C 510
570
Specific Heat Capacity, J/kg-K 870
900
Thermal Conductivity, W/m-K 150
180
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
46
Electrical Conductivity: Equal Weight (Specific), % IACS 120
150

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.9
2.7
Embodied Carbon, kg CO2/kg material 8.3
8.3
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1140
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
20 to 38
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
65 to 540
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
50
Strength to Weight: Axial, points 44
14 to 32
Strength to Weight: Bending, points 45
22 to 38
Thermal Diffusivity, mm2/s 59
72
Thermal Shock Resistance, points 20
6.1 to 14

Alloy Composition


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Aluminum (Al), % 90.7 to 93.7
96 to 98.5
Chromium (Cr), % 0 to 0.050
0
Copper (Cu), % 0 to 0.25
0 to 0.1
Iron (Fe), % 0 to 0.4
0 to 0.5
Magnesium (Mg), % 1.2 to 1.8
0.4 to 0.8
Manganese (Mn), % 0 to 0.1
0.4 to 0.8
Silicon (Si), % 0 to 0.25
0.7 to 1.3
Titanium (Ti), % 0 to 0.1
0 to 0.2
Zinc (Zn), % 5.0 to 6.0
0 to 0.2
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0 to 0.15
0 to 0.15