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7108 Aluminum vs. 7129 Aluminum

Both 7108 aluminum and 7129 Aluminum are aluminum alloys. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is 7108 aluminum and the bottom bar is 7129 Aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
69
Elongation at Break, % 11
9.0 to 9.1
Fatigue Strength, MPa 120
150 to 190
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
26
Shear Strength, MPa 210
250 to 260
Tensile Strength: Ultimate (UTS), MPa 350
430
Tensile Strength: Yield (Proof), MPa 290
380 to 390

Thermal Properties

Latent Heat of Fusion, J/g 380
380
Maximum Temperature: Mechanical, °C 210
180
Melting Completion (Liquidus), °C 630
630
Melting Onset (Solidus), °C 530
510
Specific Heat Capacity, J/kg-K 880
880
Thermal Conductivity, W/m-K 150
150
Thermal Expansion, µm/m-K 24
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
40
Electrical Conductivity: Equal Weight (Specific), % IACS 120
120

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 38
37 to 38
Resilience: Unit (Modulus of Resilience), kJ/m3 620
1050 to 1090
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
47
Strength to Weight: Axial, points 34
41
Strength to Weight: Bending, points 38
43 to 44
Thermal Diffusivity, mm2/s 59
58
Thermal Shock Resistance, points 16
19

Alloy Composition

Aluminum (Al), % 92.4 to 94.7
91 to 94
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0 to 0.050
0.5 to 0.9
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 0 to 0.1
0 to 0.3
Magnesium (Mg), % 0.7 to 1.4
1.3 to 2.0
Manganese (Mn), % 0 to 0.050
0 to 0.1
Silicon (Si), % 0 to 0.1
0 to 0.15
Titanium (Ti), % 0 to 0.050
0 to 0.050
Vanadium (V), % 0
0 to 0.050
Zinc (Zn), % 4.5 to 5.5
4.2 to 5.2
Zirconium (Zr), % 0.12 to 0.25
0
Residuals, % 0
0 to 0.15