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7049 Aluminum vs. SAE-AISI M42 Steel

7049 aluminum belongs to the aluminum alloys classification, while SAE-AISI M42 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, 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 7049 aluminum and the bottom bar is SAE-AISI M42 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
78
Tensile Strength: Ultimate (UTS), MPa 510 to 530
810 to 2310

Thermal Properties

Latent Heat of Fusion, J/g 370
270
Melting Completion (Liquidus), °C 640
1540
Melting Onset (Solidus), °C 480
1490
Specific Heat Capacity, J/kg-K 860
450
Thermal Conductivity, W/m-K 130
20
Thermal Expansion, µm/m-K 23
12

Otherwise Unclassified Properties

Base Metal Price, % relative 10
30
Density, g/cm3 3.1
8.2
Embodied Carbon, kg CO2/kg material 8.1
7.4
Embodied Energy, MJ/kg 140
100
Embodied Water, L/kg 1110
140

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 46 to 47
28 to 79
Strength to Weight: Bending, points 46 to 47
24 to 48
Thermal Diffusivity, mm2/s 51
5.4
Thermal Shock Resistance, points 22 to 23
25 to 71

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
1.1 to 1.2
Chromium (Cr), % 0.1 to 0.22
3.5 to 4.3
Cobalt (Co), % 0
7.8 to 8.8
Copper (Cu), % 1.2 to 1.9
0 to 0.25
Iron (Fe), % 0 to 0.35
76.3 to 81
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0.15 to 0.4
Molybdenum (Mo), % 0
9.0 to 10
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.25
0.15 to 0.65
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
1.2 to 1.9
Vanadium (V), % 0
1.0 to 1.4
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0