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6261 Aluminum vs. 2618A Aluminum

Both 6261 aluminum and 2618A aluminum are aluminum alloys. They have a very high 95% of their average alloy composition in common.

For each property being compared, the top bar is 6261 aluminum and the bottom bar is 2618A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
72
Elongation at Break, % 9.0 to 16
4.5
Fatigue Strength, MPa 60 to 120
120
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
27
Shear Strength, MPa 90 to 180
260
Tensile Strength: Ultimate (UTS), MPa 150 to 300
440
Tensile Strength: Yield (Proof), MPa 100 to 260
410

Thermal Properties

Latent Heat of Fusion, J/g 400
390
Maximum Temperature: Mechanical, °C 160
230
Melting Completion (Liquidus), °C 640
670
Melting Onset (Solidus), °C 610
560
Specific Heat Capacity, J/kg-K 900
880
Thermal Conductivity, W/m-K 180
150
Thermal Expansion, µm/m-K 23
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 48
37
Electrical Conductivity: Equal Weight (Specific), % IACS 160
110

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
11
Density, g/cm3 2.7
3.0
Embodied Carbon, kg CO2/kg material 8.3
8.4
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21 to 27
19
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 500
1180
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
47
Strength to Weight: Axial, points 15 to 31
41
Strength to Weight: Bending, points 23 to 37
44
Thermal Diffusivity, mm2/s 75
59
Thermal Shock Resistance, points 6.5 to 13
19

Alloy Composition

Aluminum (Al), % 96.6 to 98.6
91.5 to 95.2
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 0.15 to 0.4
1.8 to 2.7
Iron (Fe), % 0 to 0.4
0.9 to 1.4
Magnesium (Mg), % 0.7 to 1.0
1.2 to 1.8
Manganese (Mn), % 0.2 to 0.35
0 to 0.25
Nickel (Ni), % 0
0.8 to 1.4
Silicon (Si), % 0.4 to 0.7
0.15 to 0.25
Titanium (Ti), % 0 to 0.1
0 to 0.2
Zinc (Zn), % 0 to 0.2
0 to 0.15
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15