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308.0 Aluminum vs. 4145 Aluminum

Both 308.0 aluminum and 4145 aluminum are aluminum alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 95% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is 308.0 aluminum and the bottom bar is 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
73
Elongation at Break, % 2.0
2.2
Fatigue Strength, MPa 89
48
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 27
28
Shear Strength, MPa 150
69
Tensile Strength: Ultimate (UTS), MPa 190
120
Tensile Strength: Yield (Proof), MPa 110
68

Thermal Properties

Latent Heat of Fusion, J/g 470
540
Maximum Temperature: Mechanical, °C 170
160
Melting Completion (Liquidus), °C 620
590
Melting Onset (Solidus), °C 540
520
Specific Heat Capacity, J/kg-K 870
880
Thermal Conductivity, W/m-K 140
100
Thermal Expansion, µm/m-K 20
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
26
Electrical Conductivity: Equal Weight (Specific), % IACS 110
84

Otherwise Unclassified Properties

Base Metal Price, % relative 10
10
Density, g/cm3 2.9
2.8
Embodied Carbon, kg CO2/kg material 7.7
7.6
Embodied Energy, MJ/kg 140
140
Embodied Water, L/kg 1080
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.3
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 83
31
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 47
50
Strength to Weight: Axial, points 18
12
Strength to Weight: Bending, points 25
19
Thermal Diffusivity, mm2/s 55
42
Thermal Shock Resistance, points 9.2
5.5

Alloy Composition

Aluminum (Al), % 85.7 to 91
83 to 87.4
Chromium (Cr), % 0
0 to 0.15
Copper (Cu), % 4.0 to 5.0
3.3 to 4.7
Iron (Fe), % 0 to 1.0
0 to 0.8
Magnesium (Mg), % 0 to 0.1
0 to 0.15
Manganese (Mn), % 0 to 0.5
0 to 0.15
Silicon (Si), % 5.0 to 6.0
9.3 to 10.7
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 1.0
0 to 0.2
Residuals, % 0
0 to 0.15