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5021 Aluminum vs. 7129 Aluminum

Both 5021 aluminum and 7129 Aluminum are aluminum alloys. They have a moderately 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 7129 Aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
69
Elongation at Break, % 1.1 to 3.4
9.0 to 9.1
Fatigue Strength, MPa 85 to 110
150 to 190
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
26
Shear Strength, MPa 170
250 to 260
Tensile Strength: Ultimate (UTS), MPa 300 to 310
430
Tensile Strength: Yield (Proof), MPa 240 to 270
380 to 390

Thermal Properties

Latent Heat of Fusion, J/g 400
380
Maximum Temperature: Mechanical, °C 180
180
Melting Completion (Liquidus), °C 640
630
Melting Onset (Solidus), °C 590
510
Specific Heat Capacity, J/kg-K 900
880
Thermal Conductivity, W/m-K 140
150
Thermal Expansion, µm/m-K 23
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
40
Electrical Conductivity: Equal Weight (Specific), % IACS 120
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 8.6
8.3
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
37 to 38
Resilience: Unit (Modulus of Resilience), kJ/m3 440 to 550
1050 to 1090
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
47
Strength to Weight: Axial, points 30 to 32
41
Strength to Weight: Bending, points 37
43 to 44
Thermal Diffusivity, mm2/s 57
58
Thermal Shock Resistance, points 13 to 14
19

Alloy Composition

Aluminum (Al), % 95.2 to 97.7
91 to 94
Chromium (Cr), % 0 to 0.15
0 to 0.1
Copper (Cu), % 0 to 0.15
0.5 to 0.9
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 0 to 0.5
0 to 0.3
Magnesium (Mg), % 2.2 to 2.8
1.3 to 2.0
Manganese (Mn), % 0.1 to 0.5
0 to 0.1
Silicon (Si), % 0 to 0.4
0 to 0.15
Titanium (Ti), % 0
0 to 0.050
Vanadium (V), % 0
0 to 0.050
Zinc (Zn), % 0 to 0.15
4.2 to 5.2
Residuals, % 0
0 to 0.15