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4047 Aluminum vs. 4145 Aluminum

Both 4047 aluminum and 4145 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 4047 aluminum and the bottom bar is 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 72
73
Elongation at Break, % 3.4
2.2
Fatigue Strength, MPa 45
48
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 27
28
Shear Strength, MPa 69
69
Tensile Strength: Ultimate (UTS), MPa 120
120
Tensile Strength: Yield (Proof), MPa 64
68

Thermal Properties

Brazing Temperature, °C 580 to 600
570 to 600
Latent Heat of Fusion, J/g 570
540
Maximum Temperature: Mechanical, °C 160
160
Melting Completion (Liquidus), °C 580
590
Melting Onset (Solidus), °C 580
520
Specific Heat Capacity, J/kg-K 900
880
Thermal Conductivity, W/m-K 130
100
Thermal Expansion, µm/m-K 21
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
26
Electrical Conductivity: Equal Weight (Specific), % IACS 120
84

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.5
2.8
Embodied Carbon, kg CO2/kg material 7.7
7.6
Embodied Energy, MJ/kg 140
140
Embodied Water, L/kg 1050
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.5
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 28
31
Stiffness to Weight: Axial, points 16
14
Stiffness to Weight: Bending, points 55
50
Strength to Weight: Axial, points 13
12
Strength to Weight: Bending, points 21
19
Thermal Diffusivity, mm2/s 59
42
Thermal Shock Resistance, points 5.6
5.5

Alloy Composition

Aluminum (Al), % 85.3 to 89
83 to 87.4
Chromium (Cr), % 0
0 to 0.15
Copper (Cu), % 0 to 0.3
3.3 to 4.7
Iron (Fe), % 0 to 0.8
0 to 0.8
Magnesium (Mg), % 0 to 0.1
0 to 0.15
Manganese (Mn), % 0 to 0.15
0 to 0.15
Silicon (Si), % 11 to 13
9.3 to 10.7
Zinc (Zn), % 0 to 0.2
0 to 0.2
Residuals, % 0
0 to 0.15