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7175 Aluminum vs. 7178 Aluminum

Both 7175 aluminum and 7178 aluminum are aluminum alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is 7175 aluminum and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
71
Elongation at Break, % 3.8 to 5.9
4.5 to 12
Fatigue Strength, MPa 150 to 180
120 to 210
Poisson's Ratio 0.32
0.32
Shear Modulus, GPa 26
27
Shear Strength, MPa 290 to 330
140 to 380
Tensile Strength: Ultimate (UTS), MPa 520 to 570
240 to 640
Tensile Strength: Yield (Proof), MPa 430 to 490
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 380
370
Maximum Temperature: Mechanical, °C 180
180
Melting Completion (Liquidus), °C 640
630
Melting Onset (Solidus), °C 480
480
Specific Heat Capacity, J/kg-K 870
860
Thermal Conductivity, W/m-K 140
130
Thermal Expansion, µm/m-K 23
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
31
Electrical Conductivity: Equal Weight (Specific), % IACS 99
91

Otherwise Unclassified Properties

Base Metal Price, % relative 10
10
Density, g/cm3 3.0
3.1
Embodied Carbon, kg CO2/kg material 8.2
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1130
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 29
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 1310 to 1730
110 to 2220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 46
45
Strength to Weight: Axial, points 48 to 52
21 to 58
Strength to Weight: Bending, points 48 to 51
28 to 54
Thermal Diffusivity, mm2/s 53
47
Thermal Shock Resistance, points 23 to 25
10 to 28

Alloy Composition

Aluminum (Al), % 88 to 91.4
85.4 to 89.5
Chromium (Cr), % 0.18 to 0.28
0.18 to 0.28
Copper (Cu), % 1.2 to 2.0
1.6 to 2.4
Iron (Fe), % 0 to 0.2
0 to 0.5
Magnesium (Mg), % 2.1 to 2.9
2.4 to 3.1
Manganese (Mn), % 0 to 0.1
0 to 0.3
Silicon (Si), % 0 to 0.15
0 to 0.4
Titanium (Ti), % 0 to 0.1
0 to 0.2
Zinc (Zn), % 5.1 to 6.1
6.3 to 7.3
Residuals, % 0
0 to 0.15