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The Scientific World Journal
Volume 2013 (2013), Article ID 256758, 7 pages
http://dx.doi.org/10.1155/2013/256758
Research Article

Structure and Microhardness of Cu-Ta Joints Produced by Explosive Welding

1Novosibirsk State Technical University, Karl Marx Prospect 20, 630073 Novosibirsk, Russia
2Lavrentyev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Akademika Lavrentyev Prospect 15, 630090 Novosibirsk, Russia

Received 14 August 2013; Accepted 30 September 2013

Academic Editors: X. Cao, Y.-K. Gao, and Z. Zhou

Copyright © 2013 Iu. N. Maliutina et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The structure and microhardness of Cu-Ta joints produced by explosive welding were studied. It was found that, during explosive welding, an intermediate layer μm thick with a finely dispersed heterophase structure, formed between the welded copper and tantalum plates. The structure of the layer was studied by scanning and transmission electron microscopy. Microvolumes with tantalum particles distributed in a copper matrix and microvolumes of copper particles in a tantalum matrix were detected. The tantalum particles in copper have a size of  nm, with a predominance of  nm particles. A mechanism for the formation of the finely dispersed heterophase structure in explosive welding is proposed. The microhardness of interlayers with the heterophase structure reaches 280 HV, which far exceeds the microhardness of copper (~130 HV) and tantalum (~160 HV). Many twins of deformation origin were found in the structure of the copper plate. The effect of heating temperature in the range from 100 to on the microhardness of copper, tantalum, and the Cu-Ta welded joint was studied. Upon heating to , the microhardness of the intermediate layer decreases from 280 to 150 HV. The reduction in the strength properties of the weld material is mainly due to structural transformations in copper.