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7108 Aluminum vs. 7108A Aluminum

Both 7108 aluminum and 7108A aluminum are aluminum alloys. Their average alloy composition is basically identical.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
69
Elongation at Break, % 11
11 to 13
Fatigue Strength, MPa 120
120 to 130
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
26
Shear Strength, MPa 210
210
Tensile Strength: Ultimate (UTS), MPa 350
350
Tensile Strength: Yield (Proof), MPa 290
290 to 300

Thermal Properties

Latent Heat of Fusion, J/g 380
380
Maximum Temperature: Mechanical, °C 210
210
Melting Completion (Liquidus), °C 630
630
Melting Onset (Solidus), °C 530
520
Specific Heat Capacity, J/kg-K 880
870
Thermal Conductivity, W/m-K 150
150
Thermal Expansion, µm/m-K 24
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
36
Electrical Conductivity: Equal Weight (Specific), % IACS 120
110

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
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
38 to 44
Resilience: Unit (Modulus of Resilience), kJ/m3 620
610 to 640
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
47
Strength to Weight: Axial, points 34
33 to 34
Strength to Weight: Bending, points 38
38
Thermal Diffusivity, mm2/s 59
59
Thermal Shock Resistance, points 16
15 to 16

Alloy Composition

Aluminum (Al), % 92.4 to 94.7
91.6 to 94.4
Chromium (Cr), % 0
0 to 0.040
Copper (Cu), % 0 to 0.050
0 to 0.050
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 0 to 0.1
0 to 0.3
Magnesium (Mg), % 0.7 to 1.4
0.7 to 1.5
Manganese (Mn), % 0 to 0.050
0 to 0.050
Silicon (Si), % 0 to 0.1
0 to 0.2
Titanium (Ti), % 0 to 0.050
0 to 0.030
Zinc (Zn), % 4.5 to 5.5
4.8 to 5.8
Zirconium (Zr), % 0.12 to 0.25
0.15 to 0.25
Residuals, % 0
0 to 0.15