The formation of intermetallics in Ti/steel dissimilar joints welded by Cu-Nb composite filler

Chu, Qiaoling; Tong, Xiongwei; Xu, Shuai; Zhang, Min; Yan, Fuxue; Cheng, Peng; Yan, Cheng

doi:10.1016/j.jallcom.2020.154389

Cited by 30 publications

(9 citation statements)

References 45 publications

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“…Figure 5(h) shows that the welded joint shows a low tensile strength. Compared with previous studies [4,[9][10][11], this experiment shows a relatively higher hardness and more fragile joint. The main reason may be closely related to the immense number of Ti element in the WZ.…”

Section: Weld Formation and Joint Performancecontrasting

confidence: 67%

“…The tensile strength of the BM is 502 MPa. And a low tensile strength with an average value of 123 MPa is presented in the welded joint, which is lower than that of the titanium/steel bimetallic joint in previous studies [4,[9][10][11]. Figure 5(i) shows the fracture with an apparent necking deformation in the BM sample.…”

Section: Mechanical Propertiesmentioning

confidence: 70%

“…Many scholars have focused on exploring appropriate interlayer materials. It is widely reported that Cu, Cu-V, and Cu-Nb wires, as well as Mo wires, can be used as interlayer materials [8][9][10][11]. However, even if at least three types of filler materials are used to finish the butt welding of titanium/steel bimetallic sheets, cracks are often generated near the interlayer interfaces.…”

Section: Introductionmentioning

confidence: 99%

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A novel Ni–Co–Al multi-principal filler wire for inhibiting Fe–Ti intermetallic compounds in welding CP-Ti/Q345 bimetallic sheets

Liu

Wang

et al. 2022

Science and Technology of Welding and Joining

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In this work, a novel Ni-Co-Al multi-principal wire was used as only one type of filler material to finish the joining of TA1/Q345 bimetallic sheets by in situ preparation of high-entropy materials in the weld zone (WZ). The results indicated that a good weld formation could be achieved by using the Ni-Co-Al wire. The thermodynamic environment with high mixing entropy ( S mix ) and low mixing Gibbs free energy ( G mix ) in the WZ could be created by the Ni-Co-Al wire and the elements introduced from base metals. It could efficiently inhibit the formation of Fe-Ti IMCs and promote the solid-solution structures of FCC and BCC in the WZ. Fe-Ti IMCs were only presented in the transition zones on the TA1 flyer layer as well as a narrow region of the WZ within ∼ 30 μm away from the Q345/WZ interface, where the G mix was higher than the G of Fe-Ti IMCs.

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Section: Weld Formation and Joint Performancecontrasting

confidence: 67%

Section: Mechanical Propertiesmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A novel Ni–Co–Al multi-principal filler wire for inhibiting Fe–Ti intermetallic compounds in welding CP-Ti/Q345 bimetallic sheets

Liu

Wang

et al. 2022

Science and Technology of Welding and Joining

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“…The Fe–Nb intermetallic layer was formed and cracks occurred at the interface. Chu et al [12] used the Cu–Nb composite filler to butt join the explosion-welded Ti/Steel bimetallic plate. The brittle intermetallic Fe 2 Nb is dispersed and surrounded by a soft Cu phase.…”

Section: Introductionmentioning

confidence: 99%

The interface microstructure and phase constitution of Nb/316L composite plates fabricated by explosive welding

Liang

Luo

Chen

et al. 2023

Science and Technology of Welding and Joining

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Niobium has a reputation for its superior superconducting, high strength and corrosion resistance at elevated temperatures. In this work, the explosive welding technique was successfully performed to join Nb/316L dissimilar metals. To reveal the phase constitution and texture distribution at the joining interface, the EBSD test was carried out. It was concluded that an irregular large wavy structure of fine crystal, sub-grains and twin structures was formed. In addition, the recrystallised structures, substructures, deformed structures and local internal stress at the joining interface were attributed to severe plastic deformation and rapid solidification of liquid metal. Furthermore, six different deformation textures and recrystallisation textures were confirmed at the joining interface due to severe plastic deformation and dynamic recrystallisation.

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“…[5][6][7] The good plasticity of Cu-Nb flux-cored wire without any detrimental phases during welding makes it valuable to the welding of dissimilar joints. [8] The design of new high strength and high conductivity copper alloys requires information about the phase equilibria and thermodynamic properties of the Cu-based ternary systems. Therefore, a thorough thermodynamic assessment of the Cu-Nb-Ni system is necessary for providing a set of reliable thermodynamic parameters for thermodynamic extrapolations to related higher order systems.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Thermodynamic Modeling of the Phase Equilibria in the Cu-Nb-Ni Ternary System

Zhou

Shi

et al. 2021

J. Phase Equilib. Diffus.

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The phase equilibria of the Cu-Nb-Ni system were investigated via a combination of key equilibrated alloys and thermodynamic modeling. Twelve different compositions of ternary alloys were prepared to determine the isothermal sections at 700, 800 and 900°C, by means of x-ray diffraction and scanning electron microscopy with energy dispersive x-ray spectroscopy. The three-and twophase regions were determined. The solubilities of the NbNi 3 and Nb 7 Ni 6 phases were measured. No ternary compound was found in this ternary system. Based on the experimental equilibria data from the literature and the present work, a thermodynamic description of the Cu-Nb-Ni system was carried out by using the CALPHAD (CALculation of PHAse Diagrams) method. The substitutional model and sublattice model were employed to describe the solution phases and intermediate phases, respectively. A set of self-consistent thermodynamic parameters of the Cu-Nb-Ni system was conclusively obtained. Most of the reliable experimental data were reproduced by the present thermodynamic modeling.

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The formation of intermetallics in Ti/steel dissimilar joints welded by Cu-Nb composite filler

Cited by 30 publications

References 45 publications

A novel Ni–Co–Al multi-principal filler wire for inhibiting Fe–Ti intermetallic compounds in welding CP-Ti/Q345 bimetallic sheets

A novel Ni–Co–Al multi-principal filler wire for inhibiting Fe–Ti intermetallic compounds in welding CP-Ti/Q345 bimetallic sheets

The interface microstructure and phase constitution of Nb/316L composite plates fabricated by explosive welding

Experimental Investigation and Thermodynamic Modeling of the Phase Equilibria in the Cu-Nb-Ni Ternary System

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