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5021 Aluminum vs. 2124 Aluminum

Both 5021 aluminum and 2124 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 5021 aluminum and the bottom bar is 2124 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
71
Elongation at Break, % 1.1 to 3.4
5.7
Fatigue Strength, MPa 85 to 110
130
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
27
Shear Strength, MPa 170
280
Tensile Strength: Ultimate (UTS), MPa 300 to 310
490
Tensile Strength: Yield (Proof), MPa 240 to 270
430

Thermal Properties

Latent Heat of Fusion, J/g 400
390
Maximum Temperature: Mechanical, °C 180
190
Melting Completion (Liquidus), °C 640
640
Melting Onset (Solidus), °C 590
500
Specific Heat Capacity, J/kg-K 900
880
Thermal Conductivity, W/m-K 140
150
Thermal Expansion, µm/m-K 23
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
38
Electrical Conductivity: Equal Weight (Specific), % IACS 120
110

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.7
3.0
Embodied Carbon, kg CO2/kg material 8.6
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.1 to 10
27
Resilience: Unit (Modulus of Resilience), kJ/m3 440 to 550
1290
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
46
Strength to Weight: Axial, points 30 to 32
45
Strength to Weight: Bending, points 37
46
Thermal Diffusivity, mm2/s 57
58
Thermal Shock Resistance, points 13 to 14
21

Alloy Composition

Aluminum (Al), % 95.2 to 97.7
91.3 to 94.7
Chromium (Cr), % 0 to 0.15
0 to 0.1
Copper (Cu), % 0 to 0.15
3.8 to 4.9
Iron (Fe), % 0 to 0.5
0 to 0.3
Magnesium (Mg), % 2.2 to 2.8
1.2 to 1.8
Manganese (Mn), % 0.1 to 0.5
0.3 to 0.9
Silicon (Si), % 0 to 0.4
0 to 0.2
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0 to 0.15
0 to 0.25
Residuals, % 0
0 to 0.15