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4145 Aluminum vs. 4045 Aluminum

Both 4145 aluminum and 4045 aluminum are aluminum alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 96% of their average alloy composition in common.

For each property being compared, the top bar is 4145 aluminum and the bottom bar is 4045 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
71
Elongation at Break, % 2.2
2.3
Fatigue Strength, MPa 48
45
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 28
27
Shear Strength, MPa 69
69
Tensile Strength: Ultimate (UTS), MPa 120
120
Tensile Strength: Yield (Proof), MPa 68
64

Thermal Properties

Brazing Temperature, °C 570 to 600
590 to 600
Latent Heat of Fusion, J/g 540
540
Maximum Temperature: Mechanical, °C 160
160
Melting Completion (Liquidus), °C 590
600
Melting Onset (Solidus), °C 520
580
Specific Heat Capacity, J/kg-K 880
900
Thermal Conductivity, W/m-K 100
170
Thermal Expansion, µm/m-K 21
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
45
Electrical Conductivity: Equal Weight (Specific), % IACS 84
160

Otherwise Unclassified Properties

Base Metal Price, % relative 10
9.5
Density, g/cm3 2.8
2.6
Embodied Carbon, kg CO2/kg material 7.6
7.8
Embodied Energy, MJ/kg 140
150
Embodied Water, L/kg 1040
1070

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
2.4
Resilience: Unit (Modulus of Resilience), kJ/m3 31
29
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
54
Strength to Weight: Axial, points 12
13
Strength to Weight: Bending, points 19
21
Thermal Diffusivity, mm2/s 42
74
Thermal Shock Resistance, points 5.5
5.7

Alloy Composition

Aluminum (Al), % 83 to 87.4
87.4 to 91
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 3.3 to 4.7
0 to 0.3
Iron (Fe), % 0 to 0.8
0 to 0.8
Magnesium (Mg), % 0 to 0.15
0 to 0.050
Manganese (Mn), % 0 to 0.15
0 to 0.050
Silicon (Si), % 9.3 to 10.7
9.0 to 11
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0 to 0.2
0 to 0.1
Residuals, % 0 to 0.15
0 to 0.15