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7075 Aluminum vs. SAE-AISI 4140 Steel

7075 aluminum belongs to the aluminum alloys classification, while SAE-AISI 4140 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 7075 aluminum and the bottom bar is SAE-AISI 4140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 1.8 to 12
11 to 26
Fatigue Strength, MPa 110 to 190
360 to 650
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 150 to 340
410 to 660
Tensile Strength: Ultimate (UTS), MPa 240 to 590
690 to 1080
Tensile Strength: Yield (Proof), MPa 120 to 510
590 to 990

Thermal Properties

Latent Heat of Fusion, J/g 380
250
Maximum Temperature: Mechanical, °C 200
420
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 480
1420
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 130
43
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 98
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.4
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1120
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8 to 44
74 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 1870
920 to 2590
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 22 to 54
25 to 38
Strength to Weight: Bending, points 28 to 52
22 to 30
Thermal Diffusivity, mm2/s 50
12
Thermal Shock Resistance, points 10 to 25
20 to 32

Alloy Composition

Aluminum (Al), % 86.9 to 91.4
0
Carbon (C), % 0
0.38 to 0.43
Chromium (Cr), % 0.18 to 0.28
0.8 to 1.1
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 0 to 0.5
96.8 to 97.8
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.3
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 5.1 to 6.1
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0

Comparable Variants