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5042 Aluminum vs. 7178 Aluminum

Both 5042 aluminum and 7178 aluminum are aluminum alloys. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is 5042 aluminum and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
71
Elongation at Break, % 1.1 to 3.4
4.5 to 12
Fatigue Strength, MPa 97 to 120
120 to 210
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
27
Shear Strength, MPa 200
140 to 380
Tensile Strength: Ultimate (UTS), MPa 340 to 360
240 to 640
Tensile Strength: Yield (Proof), MPa 270 to 310
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 400
370
Maximum Temperature: Mechanical, °C 180
180
Melting Completion (Liquidus), °C 640
630
Melting Onset (Solidus), °C 570
480
Specific Heat Capacity, J/kg-K 900
860
Thermal Conductivity, W/m-K 130
130
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
31
Electrical Conductivity: Equal Weight (Specific), % IACS 110
91

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.7
3.1
Embodied Carbon, kg CO2/kg material 8.8
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.6 to 12
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 550 to 720
110 to 2220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
45
Strength to Weight: Axial, points 35 to 37
21 to 58
Strength to Weight: Bending, points 40 to 42
28 to 54
Thermal Diffusivity, mm2/s 53
47
Thermal Shock Resistance, points 15 to 16
10 to 28

Alloy Composition

Aluminum (Al), % 94.2 to 96.8
85.4 to 89.5
Chromium (Cr), % 0 to 0.1
0.18 to 0.28
Copper (Cu), % 0 to 0.15
1.6 to 2.4
Iron (Fe), % 0 to 0.35
0 to 0.5
Magnesium (Mg), % 3.0 to 4.0
2.4 to 3.1
Manganese (Mn), % 0.2 to 0.5
0 to 0.3
Silicon (Si), % 0 to 0.2
0 to 0.4
Titanium (Ti), % 0 to 0.1
0 to 0.2
Zinc (Zn), % 0 to 0.25
6.3 to 7.3
Residuals, % 0
0 to 0.15