Improvement of Interfacial Strength with the Addition of Ni in Al/Cu Dissimilar Joints Produced via Laser Brazing

Furuya, H. S.; Sato, Yutaka; Kokawa, Hiroyuki; Huang, Ting; Xiao, Rongshi

doi:10.1007/s11661-018-4938-z

Cited by 18 publications

(12 citation statements)

References 33 publications

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“…The effect of the addition of Ni to the Al filler material on the strength associated with the microstructure of the IMC layer at the Al/Cu dissimilar joint interface was examined. Our research group previously showed that the strength of the Al/Cu dissimilar joint obtained via laser brazing was improved by the addition of Ni, resulting from the formation of a (Cu,Ni)Al layer at the weak interface between the Al 2 Cu and Al 4 Cu 9 layers [34], which is a different mechanism obtained in this study. The definitive difference in the Al/Cu dissimilar joints produced by arc and laser brazing is the fracture location within the IMC layers formed at the joint interface.…”

Section: Discussionmentioning

confidence: 49%

“…The thickness reduction and dispersion strengthening caused by the addition of Ni could be a reason for the apparent improvement in the strength of the Al/Cu dissimilar joint by the addition of Ni. research, the Al2Cu layer with over 30 μm thickness (produced via TIG arc brazing) tended to fail in the Al2Cu layer, whereas an IMC layer thinner than about 5 μm (produced via laser brazing) mostly failed at the interface between IMC layers [34]. The difference in fracture location observed between the arc-and laser-brazed Al/Cu dissimilar joints indicates a different mechanism for strength improvement.…”

Section: Strength Improvement Mechanism With Addition Of Nimentioning

confidence: 91%

“…(Ni,Cu)Al is generally a stable phase having large negative free energy over a wide range of chemical compositions and temperatures. Furuya et al [34] reported that a (Ni,Cu)Al layer was observed between the Al 2 Cu and Al 4 Cu 9 layers at the dissimilar interface during laser brazing (which has lower heat input than TIG arc brazing) between Al-Ni alloy and pure Cu. These results suggest that a (Ni,Cu)Al layer is inevitably formed by the addition of Ni at the Al/Cu dissimilar interface, implying that the IMC phase of location G in Figure 5c…”

Section: Formation Of the Reaction Layermentioning

confidence: 99%

“…Based on these findings, our research group attempted to examine the effect of alloying elements on the strength of the Al/Cu dissimilar joint obtained via laser brazing [34]. This study showed that the addition of Ni to Al effectively improved the strength of the~5 µm thick multi-IMC structured layer due to the formation of a (Cu,Ni)Al layer at the weak interface between the Al 2 Cu and Al 4 Cu 9 layers.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Control of the Interface Layer for Strength Enhancement of Dissimilar Al/Cu Joints via Ni Addition during TIG Arc Brazing

Furuya

Yabu

Sato

et al. 2021

Metals

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Dissimilar metal joining between Al and Cu is effective for reducing the weight and cost of electrical components. In this study, dissimilar lap joining of pure Al to pure Cu with an Al-Ni filler material was conducted using tungsten inert gas (TIG) arc brazing, and the effect of Ni on the joint strength associated with the microstructure of the intermetallic compound (IMC) layer at the dissimilar interface was examined. The addition of Ni effectively increased the interfacial strength of the joints. Regardless of the addition of Ni, the joints fractured in the thick Al2Cu layer formed at the Al/Cu interface. However, the Ni addition reduced the thickness of the IMC layer and led to the formation of Al7Cu4Ni particles in the weakest Al2Cu layer. Both the thickness reduction and reinforcing Al7Cu4Ni particle formation are thought to contribute to the increase in joint strength of the Al/Cu dissimilar interface.

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Section: Discussionmentioning

confidence: 49%

Section: Strength Improvement Mechanism With Addition Of Nimentioning

confidence: 91%

Section: Formation Of the Reaction Layermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructural Control of the Interface Layer for Strength Enhancement of Dissimilar Al/Cu Joints via Ni Addition during TIG Arc Brazing

Furuya

Yabu

Sato

et al. 2021

Metals

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“…Regarding brazing dissimilar materials, Furuya, H.S. et al [ 3 ] carried out dissimilar laser lap brazing formations between aluminum and pure copper by adding nickel, which highly improved the strength of Al–Cu dissimilar joints. Liu et al [ 4 ] added rare earths (La and Nd) to Zn–10Al–5Cu solder and found that the brazed seam shear strength of the Cu–Al butt joint reached the maximum when the content of rare earth element was 0.15%.…”

Section: Introductionmentioning

confidence: 99%

Equal Load-Carrying Design of Lapped Joints of Al–Cu Dissimilar Materials

Chen

Fang

et al. 2020

Materials

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In order to avoid the adverse effects of additional moment and stress concentration of traditional lap joints, a new lap joint was put forward, according to the concept of “equal load-carrying”. Through static analysis and brazing characteristics consideration, the equal load-carrying design method of Al–Cu lap joint based on brazing method was established. Through three types of brazing, the relationship among two fracture modes, brazing process and static tension curve of lap joint, was analyzed. The results demonstrated that the selection of solder was required to simultaneously meet the requirements of brazability and mechanical properties. A certain relationship existed between the fracture mode of the lap joint and the static tensile curve, while the segments of the static tensile curve corresponded to the fracture paths of the two fracture modes. When the brazing holding time was quite short, the interface bonding was poor, while the bearing capacity of the joint was low; when the holding time was suitable, the bearing capacity of the joint reached the corresponding highest, while the fracture mode conformed to the equal load-carrying design; when the brazing holding time was quite long, the bearing capacity of the joint remained at a high level, but the fracture mode was the same as the holding time was quite short.

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Microstructure and Mechanical Properties of Vacuum Brazed NbSS/Nb5Si3 Composite Joints Using Ni-Based Filler Alloys

Ren

Xiong

Kang

et al. 2019

Metall Mater Trans A

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Improvement of Interfacial Strength with the Addition of Ni in Al/Cu Dissimilar Joints Produced via Laser Brazing

Cited by 18 publications

References 33 publications

Microstructural Control of the Interface Layer for Strength Enhancement of Dissimilar Al/Cu Joints via Ni Addition during TIG Arc Brazing

Microstructural Control of the Interface Layer for Strength Enhancement of Dissimilar Al/Cu Joints via Ni Addition during TIG Arc Brazing

Equal Load-Carrying Design of Lapped Joints of Al–Cu Dissimilar Materials

Microstructure and Mechanical Properties of Vacuum Brazed NbSS/Nb5Si3 Composite Joints Using Ni-Based Filler Alloys

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