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7129 Aluminum vs. 2124 Aluminum

Both 7129 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 7129 Aluminum and the bottom bar is 2124 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
71
Elongation at Break, % 9.0 to 9.1
5.7
Fatigue Strength, MPa 150 to 190
130
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
27
Shear Strength, MPa 250 to 260
280
Tensile Strength: Ultimate (UTS), MPa 430
490
Tensile Strength: Yield (Proof), MPa 380 to 390
430

Thermal Properties

Latent Heat of Fusion, J/g 380
390
Maximum Temperature: Mechanical, °C 180
190
Melting Completion (Liquidus), °C 630
640
Melting Onset (Solidus), °C 510
500
Specific Heat Capacity, J/kg-K 880
880
Thermal Conductivity, W/m-K 150
150
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
38
Electrical Conductivity: Equal Weight (Specific), % IACS 120
110

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.9
3.0
Embodied Carbon, kg CO2/kg material 8.3
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1150
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
27
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
1290
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
46
Strength to Weight: Axial, points 41
45
Strength to Weight: Bending, points 43 to 44
46
Thermal Diffusivity, mm2/s 58
58
Thermal Shock Resistance, points 19
21

Alloy Composition

Aluminum (Al), % 91 to 94
91.3 to 94.7
Chromium (Cr), % 0 to 0.1
0 to 0.1
Copper (Cu), % 0.5 to 0.9
3.8 to 4.9
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
0 to 0.3
Magnesium (Mg), % 1.3 to 2.0
1.2 to 1.8
Manganese (Mn), % 0 to 0.1
0.3 to 0.9
Silicon (Si), % 0 to 0.15
0 to 0.2
Titanium (Ti), % 0 to 0.050
0 to 0.15
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 4.2 to 5.2
0 to 0.25
Residuals, % 0
0 to 0.15