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7075-T6 Aluminum vs. Normalized SAE-AISI 4140

7075-T6 aluminum belongs to the aluminum alloys classification, while normalized SAE-AISI 4140 belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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-T6 aluminum and the bottom bar is normalized SAE-AISI 4140.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
300
Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 7.9
18
Fatigue Strength, MPa 160
440
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 330
630
Tensile Strength: Ultimate (UTS), MPa 560
1020
Tensile Strength: Yield (Proof), MPa 480
660

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 42
160
Resilience: Unit (Modulus of Resilience), kJ/m3 1630
1140
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 51
36
Strength to Weight: Bending, points 50
29
Thermal Diffusivity, mm2/s 50
12
Thermal Shock Resistance, points 24
30

Alloy Composition


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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