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7049 Aluminum vs. SAE-AISI 5140 Steel

7049 aluminum belongs to the aluminum alloys classification, while SAE-AISI 5140 steel belongs to the iron alloys. 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 7049 aluminum and the bottom bar is SAE-AISI 5140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
170 to 290
Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 6.2 to 7.0
12 to 29
Fatigue Strength, MPa 160 to 170
220 to 570
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 300 to 310
360 to 600
Tensile Strength: Ultimate (UTS), MPa 510 to 530
560 to 970
Tensile Strength: Yield (Proof), MPa 420 to 450
290 to 840

Thermal Properties

Latent Heat of Fusion, J/g 370
250
Maximum Temperature: Mechanical, °C 180
420
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 480
1420
Specific Heat Capacity, J/kg-K 860
470
Thermal Conductivity, W/m-K 130
45
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.1
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.4
Embodied Energy, MJ/kg 140
19
Embodied Water, L/kg 1110
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
76 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
220 to 1880
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 46 to 47
20 to 34
Strength to Weight: Bending, points 46 to 47
19 to 28
Thermal Diffusivity, mm2/s 51
12
Thermal Shock Resistance, points 22 to 23
16 to 29

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
0.38 to 0.43
Chromium (Cr), % 0.1 to 0.22
0.7 to 0.9
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
97.3 to 98.1
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0.7 to 0.9
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.25
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0