TEM Characterization of Explosive Cladding Interfaces between Refractory Metal (group V or VI) and Cu Plates

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  • PARCHURI Pradeep K
    Department of Welding Mechanism, Research Division of Materials Joining, Joining and Welding Research Institute, Osaka University
  • TAKAHASHI Makoto
    Department of Welding Mechanism, Research Division of Materials Joining, Joining and Welding Research Institute, Osaka University
  • ITO Kazuhiro
    Department of Welding Mechanism, Research Division of Materials Joining, Joining and Welding Research Institute, Osaka University
  • YAMAMOTO Hajime
    Department of Welding Mechanism, Research Division of Materials Joining, Joining and Welding Research Institute, Osaka University
  • HOKAMOTO Kazuyuki
    Institute of Pulsed Power Science, Kumamoto University

Bibliographic Information

Other Title
  • 第5,6 族金属/Cu 爆発圧接クラッド材の接合界面の透過電子顕微鏡観察
  • ダイ5,6ゾク キンゾク/Cu バクハツ アッセツ クラッドザイ ノ セツゴウ カイメン ノ トウカ デンシ ケンビキョウ カンサツ

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Description

The formation mechanism of dissimilar material interface using explosive welding（EW）has always been discussed among the researchers. One suggested that EW is purely a solid state welding technique, and another considered that EW is similar to fusion welding. In this study, cladding of a group V or VI refractory metal（RM）plate on a Cu plate was conducted using EW, to investigate the interface morphology and microstructure for discussion of the formation mechanism of RM/Cu wavy interfaces, which are regarded as a strong EW interface. Since, the RMs are inherently brittle in nature, a gelatin medium or an underwater medium was employed to obtain the RM/Cu clads instead of the conventional EW setup. The RM/Cu EW clads exhibited a wavy interface with various amplitude and wavelength depending on RM physical properties, except the W/Cu clad whose W plate had cracks initiating at the surface and reaching to the interface. TEM observation indicated that RM and Cu areas separated clearly at the interface without any mixing area or oxide layer. At the crest of wave in the Mo/Cu clad, metal jets were trapped due to relatively low collision angle, resulting in two phase structure consisting of ultrafine Mo and Cu grains. Many dislocations were observed in the RM grains near the interface, suggesting severe deformation, while some dislocations were observed in the recrystallized Cu grains not only below but also away from the interface. The observation indicates that dynamic deformation due to hydro pressure caused by collision of both metal plates at the collision point played a key role in formation of the interface morphology and microstructure.

Journal

  • Journal of Smart Processing

    Journal of Smart Processing 8 (6), 261-266, 2019-11-10

    Smart Processing Society for Materials, Environment & Energy (High Temperature Society of Japan)

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