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7178 Aluminum vs. AISI 205 Stainless Steel

7178 aluminum belongs to the aluminum alloys classification, while AISI 205 stainless steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (7, 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 205 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.5 to 12
11 to 51
Fatigue Strength, MPa 120 to 210
410 to 640
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 140 to 380
560 to 850
Tensile Strength: Ultimate (UTS), MPa 240 to 640
800 to 1430
Tensile Strength: Yield (Proof), MPa 120 to 560
450 to 1100

Thermal Properties

Latent Heat of Fusion, J/g 370
280
Maximum Temperature: Mechanical, °C 180
880
Melting Completion (Liquidus), °C 630
1380
Melting Onset (Solidus), °C 480
1340
Specific Heat Capacity, J/kg-K 860
480
Thermal Expansion, µm/m-K 23
18

Otherwise Unclassified Properties

Base Metal Price, % relative 10
11
Density, g/cm3 3.1
7.6
Embodied Carbon, kg CO2/kg material 8.2
2.6
Embodied Energy, MJ/kg 150
37
Embodied Water, L/kg 1110
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
150 to 430
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
510 to 3060
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
26
Strength to Weight: Axial, points 21 to 58
29 to 52
Strength to Weight: Bending, points 28 to 54
25 to 37
Thermal Shock Resistance, points 10 to 28
16 to 29

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0.12 to 0.25
Chromium (Cr), % 0.18 to 0.28
16.5 to 18.5
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
62.6 to 68.1
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
14 to 15.5
Nickel (Ni), % 0
1.0 to 1.7
Nitrogen (N), % 0
0.32 to 0.4
Phosphorus (P), % 0
0 to 0.060
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

Comparable Variants