Effect of interlayer thickness on microstructure and mechanical properties of as welded Ti6Al4V/Cu/NiTi joints

Zoeram, A. Shojaei; Mousavi, S.A.A. Akbari

doi:10.1016/j.matlet.2014.06.141

Cited by 51 publications

(19 citation statements)

References 10 publications

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“…The insertion of an interlayer was tried by Zoeram et al [183,184], using Cu. The embrittlement of the welded joint was reduced, as the amount of Ti ?2 Ni decreased when compared to the joint welded without interlayer.…”

Section: Niti/ti6al4vmentioning

confidence: 99%

Welding and Joining of NiTi Shape Memory Alloys: A Review

Oliveira

Miranda

Fernandes

2017

Progress in Materials Science

272

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Section: Niti/ti6al4vmentioning

confidence: 99%

Welding and Joining of NiTi Shape Memory Alloys: A Review

Oliveira

Miranda

Fernandes

2017

Progress in Materials Science

272

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“…[17] As a soft metal, Cu exhibits not only excellent thermal and electrical conductivity, but also a good metallurgical compatibility with NiTi SMAs. [18][19][20] As such, Cu interlayer has been applied in laser welding of NiTi SMAs to Ti 6 Al 4 V and stainless steel [21,22] in order to limit the formation of brittle intermetallic compounds and therefore, enhance the mechanical properties of the joints. In our previous research work, [23,24] the insertion of a Cu interlayer during USW of NiTi resulted in an improvement of the mechanical properties due to a better metallurgical adhesion at the weld interface.…”

Section: Introductionmentioning

confidence: 99%

Variable-parameter NiTi ultrasonic spot welding with Cu interlayer

Zhang

et al. 2020

Materials and Manufacturing Processes

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NiTi thin sheets were ultrasonic spot welded with a Cu interlayer, where different welding vibration amplitudes were applied to study the influence on the surface and interface microstructural characteristics, phase transformation behavior and mechanical response of the joints, which aimed to enhance the joint performance by proper optimization of the process parameters. An excellent bonding interface was achieved when an optimized vibration amplitude was applied, with a recrystallized microstructure formed in the Cu foil side near the bonding interface, which helped to improve the mechanical performance of the joints. Joints made with vibration amplitude of 55 μm had an improved strength compared to the NiTi base material.

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“…To achieve successful fabrication of complex parts of NiTi, it is necessary to develop effective and efficient processing technologies due to the poor machinability of these alloys. In recent years, various welding technologies have been used to join NiTi SMAs both to themselves and to other conventional engineering alloys such as stainless steels [ 10 , 11 ], Ti6Al4V alloys [ 12 , 13 , 14 ] and Cu-based alloys [ 15 ]. Joining techniques such as resistance spot welding [ 11 , 16 ], arc welding [ 17 ] and laser welding [ 10 , 12 ] are some examples which are capable to produce defect-free joints.…”

Section: Introductionmentioning

confidence: 99%

“…Cu is a soft metal with a melting point lower than NiTi, and it shows not only high thermal and electrical conductivity, good corrosion resistance and ductility but also a good metallurgical compatibility with NiTi [ 23 , 24 , 25 ]. For this reason, Cu interlayers have been used in dissimilar laser welding of NiTi to titanium alloys or stainless steel [ 14 , 26 , 27 ] to limit the mixing of the base material (BM) and increase the mechanical properties of the joints. It has been found that proper selection of the thickness of the Cu interlayer can enhance the mechanical properties of joints by reducing the amount of brittle Ni-Ti-based IMCs [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, Cu interlayers have been used in dissimilar laser welding of NiTi to titanium alloys or stainless steel [ 14 , 26 , 27 ] to limit the mixing of the base material (BM) and increase the mechanical properties of the joints. It has been found that proper selection of the thickness of the Cu interlayer can enhance the mechanical properties of joints by reducing the amount of brittle Ni-Ti-based IMCs [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Characterization and Mechanical Behavior of NiTi Shape Memory Alloys Ultrasonic Joints Using Cu Interlayer

Zhang

Oliveira

et al. 2018

Materials

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NiTi shape memory alloys (SMAs) are a class of functional materials which can be significantly deformed and recover their original shape via a reversible martensitic phase transformation. Developing effective joining techniques can expand the application of SMAs in the medical and engineering fields. In this study, ultrasonic spot welding (USW), a solid-state joining technique, was used to join NiTi sheets using a Cu interlayer in between the two joining sheets. The influence of USW process on the microstructural characteristics and mechanical behavior of the NiTi joints was investigated. Compared with conventional fusion welding techniques, no intermetallic compounds formed in the joints, which is extreme importance for this particular class of alloys. The joining mechanisms involve a combination of shear plastic deformation, mechanical interlocking and formation of micro-welds. A better bonding interface was obtained with higher welding energy levels, which contributed to a higher tensile load. An interfacial fracture mode occurred and the fracture surfaces exhibited both brittle and ductile-like characteristics with the existence of tear ridges and dimples. The fracture initiated at the weak region of the joint border and then propagated through it, leading to tearing of Cu foil at the fracture interface.

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Effect of interlayer thickness on microstructure and mechanical properties of as welded Ti6Al4V/Cu/NiTi joints

Cited by 51 publications

References 10 publications

Welding and Joining of NiTi Shape Memory Alloys: A Review

Welding and Joining of NiTi Shape Memory Alloys: A Review

Variable-parameter NiTi ultrasonic spot welding with Cu interlayer

Microstructural Characterization and Mechanical Behavior of NiTi Shape Memory Alloys Ultrasonic Joints Using Cu Interlayer

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