4047 (BAlSi-4) Aluminum
4047 aluminum is a 4000-series aluminum alloy. The main alloying addition is silicon. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 4047 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-4047. BAlSi-4 is the AWS designation. Additionally, the UNS number is A94047.
It originally received its standard designation in 1964.
The graph bars on the material properties cards below compare 4047 aluminum to: 4000-series alloys (top), all aluminum alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
72 GPa 10 x 106 psi
Elongation at Break
3.4 %
Fatigue Strength
45 MPa 6.6 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
27 GPa 3.9 x 106 psi
Shear Strength
69 MPa 10 x 103 psi
Tensile Strength: Ultimate (UTS)
120 MPa 17 x 103 psi
Tensile Strength: Yield (Proof)
64 MPa 9.2 x 103 psi
Thermal Properties
Brazing Temperature
580 to 600 °C 1080 to 1120 °F
Latent Heat of Fusion
570 J/g
Maximum Temperature: Mechanical
160 °C 320 °F
Melting Completion (Liquidus)
580 °C 1080 °F
Melting Onset (Solidus)
580 °C 1070 °F
Specific Heat Capacity
900 J/kg-K 0.22 BTU/lb-°F
Thermal Conductivity
130 W/m-K 77 BTU/h-ft-°F
Thermal Expansion
21 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
33 % IACS
Electrical Conductivity: Equal Weight (Specific)
120 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
2.5 g/cm3 160 lb/ft3
Embodied Carbon
7.7 kg CO2/kg material
Embodied Energy
140 MJ/kg 62 x 103 BTU/lb
Embodied Water
1050 L/kg 130 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
3.5 MJ/m3
Resilience: Unit (Modulus of Resilience)
28 kJ/m3
Stiffness to Weight: Axial
16 points
Stiffness to Weight: Bending
55 points
Strength to Weight: Axial
13 points
Strength to Weight: Bending
21 points
Thermal Diffusivity
59 mm2/s
Thermal Shock Resistance
5.6 points
Alloy Composition
Among wrought aluminum alloys, the composition of 4047 aluminum is notable for containing a comparatively high amount of silicon (Si). Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy.
| Al | 85.3 to 89 | |
| Si | 11 to 13 | |
| Fe | 0 to 0.8 | |
| Cu | 0 to 0.3 | |
| Zn | 0 to 0.2 | |
| Mn | 0 to 0.15 | |
| Mg | 0 to 0.1 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
AWS A5.8: Specification for Filler Metals for Brazing and Braze Welding
Aluminum Standards and Data, Aluminum Association Inc., 2013
ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993