Advanced characterization of intermetallic compounds in dissimilar aluminum-steel joints obtained by laser welding-brazing with Al Si filler metals

Wallerstein, D.; Solla, E.L.; Lusquiños, F.; Comesaña, R.; Val, J. del; Riveiro, A.; Pou, J.

doi:10.1016/j.matchar.2021.111345

Cited by 26 publications

(4 citation statements)

References 38 publications

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“…Among light materials, which include Mg alloys and carbon fiber-reinforced plastics (CFRPs), the lower cost, better moldability, and higher specific strength of Al alloys make them the most promising material for the Al alloy/steel-based design of multi-material automobiles 1,2) . However, to implement the widespread use of multi-material automobiles, several technical issues need to be addressed, such as the challenges of joining dissimilar materials 3,4) , lack of life cycle assessments of multi-material structures for recycling 5,6) , and galvanic corrosion between dissimilar materials [7][8][9][10][11][12] . The prevention of galvanic corrosion on Al alloys coupled with carbon steels has become one of the main challenges in the development of multi-material designs.…”

Section: Introductionmentioning

confidence: 99%

Role of KMnO<sub>4</sub>–NaF Treatment in Galvanic Corrosion Resistance of AA5083 Coupled to Steel

et al. 2023

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The role of KMnO 4 -NaF conversion treatment in the galvanic corrosion resistance of AA5083 aluminum alloy coupled to AISI 1045 carbon steel in synthetic seawater (diluted 100 times) was investigated. The 10 min-treated AA5083 was observed to reduce the period of high current density during the early stage of coupling and decrease the number of localized corrosion damages on the AA5083. The 10 min conversion treatment significantly reduced the electrode potential of bulk Al 6 (Fe, Mn), and it was concluded that the Al 6 (Fe, Mn) particles on the conversion-treated AA5083 no longer acted as a local cathode at the electrode potential when the AA5083 was in contact with AISI 1045 carbon steel. The decrease in cathodic activity of Al 6 (Fe, Mn) was attributed to the removal of Fe from the surface film of Al 6 (Fe, Mn), addition of Mn by the conversion treatment, and thickening of the film.

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Section: Introductionmentioning

confidence: 99%

Role of KMnO<sub>4</sub>–NaF Treatment in Galvanic Corrosion Resistance of AA5083 Coupled to Steel

et al. 2023

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“…5,6 Therefore, AlSi alloys need to be jointed to form a sealed integrated circuit for signal transmission, and the study of alloy joining properties is inevitable. [7][8][9][10] And, the brazed joint between AlSi alloy and itself (AlSi-AlSi joint) is necessary.…”

Section: Introductionmentioning

confidence: 99%

“…However, the use of AlSi alloys in large‐scale industrial application was still limited, because of its difficult machinability 5,6 . Therefore, AlSi alloys need to be jointed to form a sealed integrated circuit for signal transmission, and the study of alloy joining properties is inevitable 7–10 . And, the brazed joint between AlSi alloy and itself (AlSi‐AlSi joint) is necessary.…”

Section: Introductionmentioning

confidence: 99%

Interfacial structure and strength of Al‐25Si‐4Mg‐1Cu joint brazed with Zn interlayer

Chen

et al. 2023

Engineering Reports

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A high‐quality joint of the parent metal Al‐25Si‐4Mg‐1Cu alloy (AlSi alloy) was brazed to itself using Zn layer as a filler material. The typical microstructure of AlSi/Zn/AlSi joint was Al‐Zn solid solution, primary Si phase and α‐Al phase. When brazing temperature was increased from 400 to 405°C, Zn began to melt and reacted with Al diffused from base material, then Si phase formed. While the increase in brazing temperature to 415°C caused the gradual buring of Zn from Al‐Zn solid solution, and α‐Al remained. Furthermore, the shear strength of the joint increased because of α‐Al phase and Si phase formation. In addition, with brazing time extending from 8 to 12 min, the amount of Al‐Zn solid solution decreased, while the amount of Si phase and α‐Al phase increased, thus the shear strength of the joint was improved. While the increase in holding time extending to 14 min caused many micro‐voids formed, and the shear strength of the joint was reduced. Finally, the shear strength of the joint brazed at 415°C for 12 min reached 65.6 MPa.

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“…They found that the thickness of the IMCs at the interface reached a minimum of 2 µm when using an AlSi12 welding wire as the filler metal. Wallerstein et al [18] analyzed the phase composition at the interface of the Al alloy and steel laser welding-brazing joints. They confirmed that the η-Fe 2 Al 5 phase was generated perpendicular to the steel side while θ-Fe 4 Al 13 was generated on the Al alloy side.…”

Section: Introductionmentioning

confidence: 99%

Research on the Microstructure and Properties of Al Alloy/Steel CMT Welding-Brazing Joints with Al–Si Flux-Cored Welding Wires

Liu,

Pu,

et al. 2023

Coatings

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Al alloy/steel composite structures combine the advantage of a lightweight Al alloy and high-strength steel and are widely used in new energy vehicles, solar photovoltaic, and other fields. The main problems with the connection of an Al alloy and steel are poor weld formation and difficulty in controlling the thickness of the intermetallic compounds (IMCs) at the interface of the Al alloy and steel, which deteriorates the mechanical properties and corrosion resistance of the Al alloy/steel joints. Therefore, experiments on Al alloy/steel CMT (cold metal transfer, CMT) welding brazing were conducted by using AlSi5 and AlSi12 flux-cored welding wires as filler metals. The macro morphology, microstructure composition, tensile strength, and corrosion resistance of the Al alloy/steel joints were then analyzed. The mechanism of the Noclock flux on the wettability and spreadability of the Al–Si welding wire to a low-carbon steel surface was discussed and the formation behavior of the IMCs at the interface layer of the Al alloy/steel joints was clarified. The results showed that the NH4F and NH4AlF4 of the Noclock flux induced and accelerated the removal of oxide films on the surface of the Al alloy and Al–Si welding wire at a high temperature. It promoted the wettability and spreadability of the Al–Si welding wire, which resulted in the improvement of the Al alloy/steel joint formation. Under the CMT arc heat source, the Al–Si welding wire melted, and then a chemical metallurgical reaction occurred among the Al, Si, and Fe elements. The τ5-Al7.2Fe1.8Si phase formed preferentially near the Al alloy fusion zone while the θ-Fe (Al, Si)3 phase formed near the steel side. Actually, the interface reaction layer was composed of a double-layer compound including the τ5-Al7.2Fe1.8Si phase and θ-Fe (Al, Si)3 phase. Additionally, the IMC thickness of the Al alloy/steel joint with the AlSi12 flux-cored welding wire was 3.01 μm, which was less than that with the AlSi5 flux-cored welding wire, so its tensile strength was less but its corrosion resistance was superior. The main reason for the corrosion resistance of Al alloy/steel joints was the presence of a large amount of Al2O3, FeO, and Fe2O3 in the passive film.

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Advanced characterization of intermetallic compounds in dissimilar aluminum-steel joints obtained by laser welding-brazing with Al Si filler metals

Cited by 26 publications

References 38 publications

Role of KMnO<sub>4</sub>–NaF Treatment in Galvanic Corrosion Resistance of AA5083 Coupled to Steel

Role of KMnO<sub>4</sub>–NaF Treatment in Galvanic Corrosion Resistance of AA5083 Coupled to Steel

Interfacial structure and strength of Al‐25Si‐4Mg‐1Cu joint brazed with Zn interlayer

Research on the Microstructure and Properties of Al Alloy/Steel CMT Welding-Brazing Joints with Al–Si Flux-Cored Welding Wires

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