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4145 Aluminum vs. AISI 205 Stainless Steel

4145 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 (8, 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 4145 aluminum and the bottom bar is AISI 205 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
11 to 51
Fatigue Strength, MPa 48
410 to 640
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Shear Strength, MPa 69
560 to 850
Tensile Strength: Ultimate (UTS), MPa 120
800 to 1430
Tensile Strength: Yield (Proof), MPa 68
450 to 1100

Thermal Properties

Latent Heat of Fusion, J/g 540
280
Maximum Temperature: Mechanical, °C 160
880
Melting Completion (Liquidus), °C 590
1380
Melting Onset (Solidus), °C 520
1340
Specific Heat Capacity, J/kg-K 880
480
Thermal Expansion, µm/m-K 21
18

Otherwise Unclassified Properties

Base Metal Price, % relative 10
11
Density, g/cm3 2.8
7.6
Embodied Carbon, kg CO2/kg material 7.6
2.6
Embodied Energy, MJ/kg 140
37
Embodied Water, L/kg 1040
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
150 to 430
Resilience: Unit (Modulus of Resilience), kJ/m3 31
510 to 3060
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
26
Strength to Weight: Axial, points 12
29 to 52
Strength to Weight: Bending, points 19
25 to 37
Thermal Shock Resistance, points 5.5
16 to 29

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0.12 to 0.25
Chromium (Cr), % 0 to 0.15
16.5 to 18.5
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
62.6 to 68.1
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
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), % 9.3 to 10.7
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0