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5251 Aluminum vs. 2117 Aluminum

Both 5251 aluminum and 2117 aluminum are aluminum alloys. They have a very high 96% of their average alloy composition in common.

For each property being compared, the top bar is 5251 aluminum and the bottom bar is 2117 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 44 to 79
70
Elastic (Young's, Tensile) Modulus, GPa 68
71
Elongation at Break, % 2.0 to 19
26
Fatigue Strength, MPa 59 to 110
95
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
27
Shear Strength, MPa 110 to 160
200
Tensile Strength: Ultimate (UTS), MPa 180 to 280
300
Tensile Strength: Yield (Proof), MPa 67 to 250
170

Thermal Properties

Latent Heat of Fusion, J/g 400
400
Maximum Temperature: Mechanical, °C 180
220
Melting Completion (Liquidus), °C 650
650
Melting Onset (Solidus), °C 610
550
Specific Heat Capacity, J/kg-K 900
880
Thermal Conductivity, W/m-K 150
150
Thermal Expansion, µm/m-K 24
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
40
Electrical Conductivity: Equal Weight (Specific), % IACS 120
120

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.7
3.0
Embodied Carbon, kg CO2/kg material 8.5
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.4 to 27
64
Resilience: Unit (Modulus of Resilience), kJ/m3 33 to 450
190
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
47
Strength to Weight: Axial, points 18 to 29
28
Strength to Weight: Bending, points 26 to 35
33
Thermal Diffusivity, mm2/s 61
59
Thermal Shock Resistance, points 7.9 to 13
12

Alloy Composition


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Aluminum (Al), % 95.5 to 98.2
91 to 97.6
Chromium (Cr), % 0 to 0.15
0 to 0.1
Copper (Cu), % 0 to 0.15
2.2 to 4.5
Iron (Fe), % 0 to 0.5
0 to 0.7
Magnesium (Mg), % 1.7 to 2.4
0.2 to 1.0
Manganese (Mn), % 0.1 to 0.5
0.4 to 1.0
Silicon (Si), % 0 to 0.4
0.2 to 0.8
Titanium (Ti), % 0 to 0.15
0 to 0.25
Zinc (Zn), % 0 to 0.15
0 to 0.25
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0 to 0.15
0 to 0.15