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4047 Aluminum vs. 4045 Aluminum

Both 4047 aluminum and 4045 aluminum are aluminum alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is 4047 aluminum and the bottom bar is 4045 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 72
71
Elongation at Break, % 3.4
2.3
Fatigue Strength, MPa 45
45
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 27
27
Shear Strength, MPa 69
69
Tensile Strength: Ultimate (UTS), MPa 120
120
Tensile Strength: Yield (Proof), MPa 64
64

Thermal Properties

Brazing Temperature, °C 580 to 600
590 to 600
Latent Heat of Fusion, J/g 570
540
Maximum Temperature: Mechanical, °C 160
160
Melting Completion (Liquidus), °C 580
600
Melting Onset (Solidus), °C 580
580
Specific Heat Capacity, J/kg-K 900
900
Thermal Conductivity, W/m-K 130
170
Thermal Expansion, µm/m-K 21
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
45
Electrical Conductivity: Equal Weight (Specific), % IACS 120
160

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.5
Density, g/cm3 2.5
2.6
Embodied Carbon, kg CO2/kg material 7.7
7.8
Embodied Energy, MJ/kg 140
150
Embodied Water, L/kg 1050
1070

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.5
2.4
Resilience: Unit (Modulus of Resilience), kJ/m3 28
29
Stiffness to Weight: Axial, points 16
15
Stiffness to Weight: Bending, points 55
54
Strength to Weight: Axial, points 13
13
Strength to Weight: Bending, points 21
21
Thermal Diffusivity, mm2/s 59
74
Thermal Shock Resistance, points 5.6
5.7

Alloy Composition

Aluminum (Al), % 85.3 to 89
87.4 to 91
Copper (Cu), % 0 to 0.3
0 to 0.3
Iron (Fe), % 0 to 0.8
0 to 0.8
Magnesium (Mg), % 0 to 0.1
0 to 0.050
Manganese (Mn), % 0 to 0.15
0 to 0.050
Silicon (Si), % 11 to 13
9.0 to 11
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0 to 0.2
0 to 0.1
Residuals, % 0
0 to 0.15