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Microstructural characterisation of interfaces in magnetic pulse welded aluminum/aluminum joints

Sharafiev, Semen and Pabst, Christian and Wagner, Martin F.-X. and Groche, Peter (2016):
Microstructural characterisation of interfaces in magnetic pulse welded aluminum/aluminum joints.
In: 18th Chemnitz Seminar on Materials Engineering – 18. Werkstofftechnisches Kolloquium, [Conference or Workshop Item]

Abstract

Electromagnetic pulse welding provides novel and useful solutions in the field of multi-material structures. The joining occurs through the high-energy mechanical impact of metal sheets, which leads to a strong, cohesive, metallic bonding between the sheets. The high-velocity collision results in changes of the microstructure in the regions adjacent to the interface. The aim of this work is the microstructural characterization of the interface and the welding zone of Al/Al joints. One typical interface is analysed by optical and electron microscopy and using the electron backscatter diffraction technique. Our results show that the interface exhibits a well-known type of wavy weld geometry. Moreover, the formation of an intermediate layer that is different from the bulk aluminium structure is observed. The microstructure of this intermediate layer consists of ultrafine grains and in some regions exhibits a columnar grain structure. It is likely that this special microstructure (which plays an important role in determining the cohesive, continuous bonding between the metal sheets) is formed through a rapid melting and crystallisation process in the interface region.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Sharafiev, Semen and Pabst, Christian and Wagner, Martin F.-X. and Groche, Peter
Title: Microstructural characterisation of interfaces in magnetic pulse welded aluminum/aluminum joints
Language: English
Abstract:

Electromagnetic pulse welding provides novel and useful solutions in the field of multi-material structures. The joining occurs through the high-energy mechanical impact of metal sheets, which leads to a strong, cohesive, metallic bonding between the sheets. The high-velocity collision results in changes of the microstructure in the regions adjacent to the interface. The aim of this work is the microstructural characterization of the interface and the welding zone of Al/Al joints. One typical interface is analysed by optical and electron microscopy and using the electron backscatter diffraction technique. Our results show that the interface exhibits a well-known type of wavy weld geometry. Moreover, the formation of an intermediate layer that is different from the bulk aluminium structure is observed. The microstructure of this intermediate layer consists of ultrafine grains and in some regions exhibits a columnar grain structure. It is likely that this special microstructure (which plays an important role in determining the cohesive, continuous bonding between the metal sheets) is formed through a rapid melting and crystallisation process in the interface region.

Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institut für Produktionstechnik und Umformmaschinen (PtU)
Event Title: 18th Chemnitz Seminar on Materials Engineering – 18. Werkstofftechnisches Kolloquium
Date Deposited: 18 May 2016 09:47
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