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6151 Aluminum vs. 7021 Aluminum

Both 6151 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 6151 aluminum and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
69
Elongation at Break, % 1.1 to 5.7
9.4
Fatigue Strength, MPa 80 to 100
150
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
26
Shear Strength, MPa 190 to 200
270
Tensile Strength: Ultimate (UTS), MPa 330 to 340
460
Tensile Strength: Yield (Proof), MPa 270 to 280
390

Thermal Properties

Latent Heat of Fusion, J/g 410
380
Maximum Temperature: Mechanical, °C 170
200
Melting Completion (Liquidus), °C 650
630
Melting Onset (Solidus), °C 590
510
Specific Heat Capacity, J/kg-K 900
870
Thermal Conductivity, W/m-K 170
150
Thermal Expansion, µm/m-K 23
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 45
38
Electrical Conductivity: Equal Weight (Specific), % IACS 150
120

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.7
2.9
Embodied Carbon, kg CO2/kg material 8.2
8.3
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.5 to 18
41
Resilience: Unit (Modulus of Resilience), kJ/m3 520 to 580
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
47
Strength to Weight: Axial, points 34
44
Strength to Weight: Bending, points 39
45
Thermal Diffusivity, mm2/s 70
59
Thermal Shock Resistance, points 15
20

Alloy Composition

Aluminum (Al), % 95.6 to 98.8
90.7 to 93.7
Chromium (Cr), % 0.15 to 0.35
0 to 0.050
Copper (Cu), % 0 to 0.35
0 to 0.25
Iron (Fe), % 0 to 1.0
0 to 0.4
Magnesium (Mg), % 0.45 to 0.8
1.2 to 1.8
Manganese (Mn), % 0 to 0.2
0 to 0.1
Silicon (Si), % 0.6 to 1.2
0 to 0.25
Titanium (Ti), % 0 to 0.15
0 to 0.1
Zinc (Zn), % 0 to 0.25
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15