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Journal of Electron Microscopy 49(1): 5-16 (2000)
© 2000 Oxford University Press

Morphology and structure of various phases at the bonding interface of Al/steel formed by explosive welding

Yan Li1,2, Hatsujiro Hashimoto1,*, Eiichi Sukedai1, Yimin Zhang1,2 and Zenkui Zhang3

1Faculty of Engineering, Okayama University of Science Ridai-cho, Okayama 700-0005 Japan
2Luoyang Institute of Technology Luoyang, 471039 China
3Luoyang Ship Materials Research Institute Luoyang, China

*To whom correspondence should be addressed. E-mail: hashi{at}pub.ous.ac.jp

The bonding interface of explosively-welded aluminium and steel in three explosive conditions have been investigated by using scanning electron microscopy, transmission electron microscopy, electron diffraction and electron probe microanalysis methods. The results show that all the interfaces have the shape of waves with curled front formed by process of superplasticity and some discontinuous reacted zones. They consist of amorphous and nano sized crystals and quasi-crystals as well as the compounds such as AlFe, Al2Fe, Al3Fe and Al6Fe with various shapes. The basal steel crystal near the interface has structure of martensite and perlite crystals which are deformed by the process of superplasticity. The size of reacted zone becomes large with increasing amount of explosive charge powder and separation of the driver Al plate from the basal steel plate.

Keywords     explosive welding, bonding interface, interfaces of Al/steel, electron microscopy of explosively welded interface

Received     11 December 1998, accepted 11 May 1999


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