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7178 Aluminum vs. AISI 384 Stainless Steel

7178 aluminum belongs to the aluminum alloys classification, while AISI 384 stainless steel belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (9, 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 7178 aluminum and the bottom bar is AISI 384 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
76
Tensile Strength: Ultimate (UTS), MPa 240 to 640
480

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Maximum Temperature: Mechanical, °C 180
910
Melting Completion (Liquidus), °C 630
1420
Melting Onset (Solidus), °C 480
1380
Specific Heat Capacity, J/kg-K 860
480
Thermal Conductivity, W/m-K 130
16
Thermal Expansion, µm/m-K 23
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 91
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
20
Density, g/cm3 3.1
7.9
Embodied Carbon, kg CO2/kg material 8.2
3.7
Embodied Energy, MJ/kg 150
52
Embodied Water, L/kg 1110
150

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 21 to 58
17
Strength to Weight: Bending, points 28 to 54
17
Thermal Diffusivity, mm2/s 47
4.3
Thermal Shock Resistance, points 10 to 28
11

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0 to 0.040
Chromium (Cr), % 0.18 to 0.28
15 to 17
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
60.9 to 68
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0 to 2.0
Nickel (Ni), % 0
17 to 19
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0