Formation and Growth of Intermetallic Compound at Interface of Steel/Aluminum Bonding Sheet

Oikawa, Hatsuhiko; Saitoh, Tohru; Nagase, T.; Kiriyama, Tadao

doi:10.2355/tetsutohagane1955.83.10_641

Cited by 51 publications

(18 citation statements)

References 5 publications

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“…8) However, it has been a common problem that the formation of a brittle aluminum-rich Al-Fe intermetallic compound (IMC) layer at the bonded interface causes low strength in aluminum/steel dissimilar metal joints. 1) Therefore, microstructual control of the interfacial reaction layers is essential to obtain highreliability dissimilar metal joints. Our previous work reported that the interfacial reaction layer was modified by the addition of silicon and/or copper to 6000 series aluminum alloy through diffusion bonding, and this leads to a higher strength of an aluminum alloy/low carbon steel (SPCE) dissimilar metal joint for the same thickness of the reaction layer.…”

Section: Introductionmentioning

confidence: 99%

“…To achieve weight reduction in automobiles at lower cost, hybrid car bodies made from aluminum alloys and steels are feasible structures, and involve the joining of these dissimilar metals. [1][2][3][4][5] The dissimilar metal joining of 6000 series aluminum alloys and steels has been considerably researched using several joining techniques, such as spot welding, 6) laser welding 7) and friction stir welding (FSW). 8) However, it has been a common problem that the formation of a brittle aluminum-rich Al-Fe intermetallic compound (IMC) layer at the bonded interface causes low strength in aluminum/steel dissimilar metal joints.…”

Section: Introductionmentioning

confidence: 99%

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Nanoindentation Measurement of Interfacial Reaction Layers in 6000 Series Aluminum Alloys and Steel Dissimilar Metal Joints with Alloying Elements

et al. 2011

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Nanoindentation measurements were successfully applied to the interfacial reaction layers in dissimilar metal joints of 6000 series aluminum alloys containing alloying elements to steel in order to characterize their mechanical properties. The nanoindentation hardness of the reaction layer formed at the aluminum side was lower than that formed at the low carbon steel (SPCE) side of the investigated joints. At the aluminum side, the nanoindentation hardness changed by the addition of alloying elements. The hardness of the resulting Al 12 Fe 3 Si intermetallic compound (IMC) (and the same IMC containing Cu) was lower than that of Al 3 Fe. In comparison with the hardness values obtained from bulk Al-Fe binary series IMCs, it is considered that hardness changes of interfacial reaction layers are derived from the crystal structural changes produced by the alloying elements. The result of micro-testing of Al-Fe series IMCs indicates that the modification of the interfacial reaction layer by alloying elements contributes to higher ductility and the improvement of joint strength through crystal structural change.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanoindentation Measurement of Interfacial Reaction Layers in 6000 Series Aluminum Alloys and Steel Dissimilar Metal Joints with Alloying Elements

et al. 2011

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“…However, the reaction layers are considered to be aluminum-rich Al-Fe IMC, as normally observed in aluminum steel dissimilar joints in the precious works. [6][7][8] In the joint with SPCC, oxygen was not detected at the interface, showing that the oxide film on the surface of aluminum alloy is electrically and mechanically destroyed. In this time, however, the destruction of the oxide film and heating occur locally, resulting the ununiformity of the reaction layer formed as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Effects of Zn-Based Alloys Coating on Mechanical Properties and Interfacial Microstructures of Steel/Aluminum Alloy Dissimilar Metals Joints Using Resistance Spot Welding

et al. 2011

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The effects of Zn-based alloys coating (Zn, Al-Zn and Al-Mg-Zn) on the bondability of steel/aluminum alloy dissimilar metals joints were evaluated, in order to achieve strength in lower welding current. In the joint with Zn-based alloys insert, the oxide film on the aluminum alloy was sufficiently removed through eutectic reaction of Zn-based alloys and aluminum. In the joint with Zn-coated steel (GI), higher welding current is necessary to discharge the zinc coating and the oxide film from the bonding interface sufficiently. The thinner aluminum plate after welding and the thick reaction layer cause the decrease of cross tensile strength in the joints with no coating steel (SPCC) and Al-Zn-coated steel. Using Al-Mg-Zn-coated steel, higher strength was achieved in a lower welding current. This is because Al-Mg-Zn-coating melted at lower temperature than Zn and Al-Zn-coating, and the removal of the coating material and the oxide film on the aluminum alloy were sufficiently performed in the lower welding current.

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“…For the formation of the thin and uniform compound layer, the nucleation of the compound must occur simultaneously at the whole bonding interface, which is not easily achieved in solid state because of slow kinetics, and the introduction of a liquid is considered to be critical to the uniformity of the compound layer. At the same time, the liquid needs to disappear during the process since the remaining of the liquid degrades the bonding strength by promoting the growth of the compound layer 11) and forming a microstructure different from that of the base metal. For these purposes, we employed a method in accordance with the concept of transient liquid phase (TLP) bonding.…”

Section: Concept Of New Bonding Methodsmentioning

confidence: 99%

Reactive Transient Liquid Phase Bonding between AZ31 Magnesium Alloy and Low Carbon Steel

et al. 2011

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A new liquid-phase bonding method was developed to establish a strong bonding between Al bearing Mg alloys and steels by intentionally forming a thin and uniform reaction layer at the bonding interface. By adopting Ag as an interlayer between the Mg alloys and steel, Mg-Ag eutectic melt is produced at 773 K and nano-scale Fe-Al reaction layer is uniformly formed at the melt-steel interface during the isothermal solidification of the melt which is driven by the diffusion of Ag into the Mg alloy. At the completion of the solidification, exceptionally strong bonding, exceeding the yield strength of the base Mg alloys, is achieved.

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Formation and Growth of Intermetallic Compound at Interface of Steel/Aluminum Bonding Sheet

Cited by 51 publications

References 5 publications

Nanoindentation Measurement of Interfacial Reaction Layers in 6000 Series Aluminum Alloys and Steel Dissimilar Metal Joints with Alloying Elements

Nanoindentation Measurement of Interfacial Reaction Layers in 6000 Series Aluminum Alloys and Steel Dissimilar Metal Joints with Alloying Elements

Effects of Zn-Based Alloys Coating on Mechanical Properties and Interfacial Microstructures of Steel/Aluminum Alloy Dissimilar Metals Joints Using Resistance Spot Welding

Reactive Transient Liquid Phase Bonding between AZ31 Magnesium Alloy and Low Carbon Steel

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