High-Speed Deformation and Collision Behavior of Pure Aluminum Plates in Magnetic Pulse Welding

Watanabe, Mitsuhiro; Kumai, Shinji

doi:10.2320/matertrans.l-m2009816

Cited by 64 publications

(49 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In terms of application and properties, CS is perhaps best to be compared to thermal spraying processes, as in [24,25]. In view of relevant physical phenomena, however, CS is most closely related to explosive powder shock compaction, magnetic pulse welding (MPW) [26] and explosive welding. Likewise, some of the conventional thermal spraying processes, such as arc or plasma spraying where there is extensive melting and resolidification, may be best compared to fusion welding from the viewpoint of solidification science.…”

Section: Introductionmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

View full text Add to dashboard Cite

Cold spraying is a solid-state powder deposition process with several unique characteristics, allowing production of coatings or bulk components from a wide range of materials. The process has attracted much attention from academia and industry over the past two decades.The technical interest in cold spraying is twofold: first as a coating process for applications in surface technology, and second as a solid-state additive manufacturing process, offering an alternative to selective laser melting or electron beam melting methods. Moreover, cold spraying can be used to study materials behaviour under extremely high strain rates, high pressures and high cooling rates. The cold spraying process is thus considered to be relevant for various industrial applications, as well as for fundamental studies in materials science.This article aims to provide an overview of the cold spray process, the current understanding of the deposition mechanisms, and the related models and experiments, from a materials science perspective. IntroductionCold spraying (CS) is a solid-state material deposition technique, where micron-sized particles of a powder bond to a substrate as a result of high-velocity impact and the associated severe plastic deformation. Acceleration of particles to high velocities is obtained via expansion of a pressurised and (ironically) 'hot' gas through a diverging-converging nozzle.Despite heating the process gas -which is to provide higher acceleration of the gas and also to facilitate particle deformation through thermal softening -the feedstock remains in the solid state throughout the entire process; hence the name 'cold' spraying. This is to underline the contrast to conventional thermal spraying where particles are completely or partially molten upon impact onto the substrate. Alternative terminology includes cold gas spray, micro cold spray, cold gas dynamic spray, kinetic spray, supersonic particle deposition and metal powder application (MPA), all of which refer to the same principle of solid-state powder deposition as described above. CS is used for coating and repair. It is also used for additive manufacturing (AM) at relatively high deposition rates as compared to the methods based on selective laser or electron beam melting. The main advantage of CS is that it alleviates the problems associated with high temperature processing of materials, such as oxidation and unfavourable structural changes. It is possibly the only continuous method to produce bulk components of metastable materials that are available only in the powder form, e.g. as obtained from mechanical attrition or gas atomisation. The aim of the present paper is to provide an overview of CS from a materials perspective, particularly for a broader audience in materials research, e.g. with interest in dynamic phenomena, plasticity and phase transformations. In terms of application and properties, CS is perhaps best to be compared to thermal spraying processes, as in [24,25]. In view of relevant physical phenomena, however, CS is mos...

show abstract

Section: Introductionmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

View full text Add to dashboard Cite

show abstract

“…The welding interface exhibited characteristic wavy morphology, as well as similar and dissimilar metal joints. 1,13,14) A thin intermediate layer was also produced along the wavy interface. In the intermediate layer, several shadings of medium contrast between the aluminum and the metallic glass were observed.…”

Section: Welding Interface Of Lap Jointsmentioning

confidence: 99%

Microstructural Characterization of Intermediate Layer Produced at Aluminum/Metallic Glass Interface Fabricated by Magnetic Pulse Welding

2012

Self Cite

View full text Add to dashboard Cite

Lap joining of crystalline pure aluminum and metallic glass (Zr 48 Cu 36 Al 8 Ag 8 and Cu 50 Zr 42.5 Al 7.5 ) was carried out by using magnetic pulse welding. Transmission electron microscopy was performed for the welding interface in order to investigate microstructure of the intermediate layer produced at the welding interface. The welding interface exhibited characteristic wavy morphology as well as similar-and dissimilar-metal joints. The intermediate layer was produced along the wavy interface. TEM observation and electron diffraction pattern analysis revealed that the intermediate layer was not monolithic but had a multi-phase structure. A part of the layer consisted of the extremely fine grains and amorphous phase particles. The other part of the layer was composed of the stacked extremely thin amorphous layers. STEM-EDS analysis found that the chemical composition of the amorphous phase in the intermediate layer was not constant and was different from that of the metallic glass matrix.

show abstract

“…The collision speed estimated by Watanabe et al was 250 m/s, which is twice higher than the average collision speed (130 m/s) investigated in the same method of present study. 25) This difference is suggested to be due to electromagnetic force generated by the interaction of discharge current, magnetic ux and eddy current, which continues to accelerate the yer sheet until discharge current disappears. The pure Al sheet and the Al alloy used in the present study have different electrical conductivity and mechanical properties.…”

Section: Collision Speed and Weld Widthmentioning

confidence: 99%

“…Previously, Okagawa and Watanabe et al have reported on the collision speed of pure aluminum sheet and pure copper sheet. 19,25,26) However, there are still no studies on the lap joint of 2017-T3 or 2024-T3 sheets. Figure 7 shows the relationship of discharge energy, travelling velocity and collision time for both 2017-T3/ 2017-T3 and 2024-T3/2024-T3 lap joints when the gap is set to 1 mm.…”

Section: Collision Speed and Weld Widthmentioning

confidence: 99%

“…It was reported that a ash was observed, 1 micro-second after the initial collision between the two sheets, and this ash indicates that metal jet was discharged during the process. 25) This means, the inclined collision between parent sheet and yer sheet in MPW, (similarly in explosive welding), eliminates the oxide and contaminations on the surface of the metal sheet, thus producing clean metal surfaces suitable for bonding. This phenomenon is consistent with the results from SEM observation in this study.…”

Section: Microstructure Of Metal Jet and Joint Interfacementioning

confidence: 99%

See 1 more Smart Citation

Fabrication of 2000 Series Aluminum Alloy Lap Joint Sheets by Magnetic Pulse Welding and Their Interfacial Microstructure Observations

2017

View full text Add to dashboard Cite

Lap joint sheets of 2017-T3/2017-T3 and 2024-T3/2024-T3 were fabricated by magnetic pulse welding (MPW). Tensile shear tests were performed on the welded sheet, and a good lap joint was achieved at a discharge energy more than 3.0 kJ for both lap joint sheets. Weld interface showed wavy morphology when bonding at an adequate amount of discharge energy. Weld width of the lap joint sheets tend to increase with increasing of discharge energy. Collision speed calculated based on collision time was 211 m/s and estimated 1.5 GPa of the collision pressure at discharge energy of 3.5 kJ. SEM and EDS results showed that the weld interface exhibited no signi cant contrast of intermediate layer and oxides. A Metal jet was observed as aggregates of ne particles with size of less than 100 nm at the outside of bonded area. From TEM observation at the bonding interface, Al phases between yer and parent sheets had direct contact without the intervention of the oxide, and localized melting was not recognized. From these obtained results, good lap joint is attributed to true-contact of Al phases, an increasing of weld width, the anchor effect, and work hardening at weld interface.

show abstract

High-Speed Deformation and Collision Behavior of Pure Aluminum Plates in Magnetic Pulse Welding

Cited by 64 publications

References 23 publications

Cold spraying – A materials perspective

Cold spraying – A materials perspective

Microstructural Characterization of Intermediate Layer Produced at Aluminum/Metallic Glass Interface Fabricated by Magnetic Pulse Welding

Fabrication of 2000 Series Aluminum Alloy Lap Joint Sheets by Magnetic Pulse Welding and Their Interfacial Microstructure Observations

Contact Info

Product

Resources

About