High resolution electron microscopy study in ZrC-doped WC-12mass%co alloys

Y. Yamanaka, T. Taniuchi, F. Shirase, T. Tanase, Y. Ikuhara, T. Yamamoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Microstructures in ZrC-doped WC-Co alloys, which were prepared by liquid-phase and solid-phase sintering, were investigated mainly by high-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectrometry (EDS). HRTEM study has revealed that multi facet structures, which are often observed in VC-doped alloys, were not formed in ZrC-doped alloys. In addition, the segregation of Zr at WC/Co interfaces could not be detected by EDS analysis even with nano size electron probe. Doped ZrC was found to exist as other carbide grains without dissolving into γ-phase, i.e., Co phase by EDS-mapping performed for liquid-phase sintered alloys. In the case of liquid-phase sintering, the inhibition effect for the grain growth caused by ZrC-doping was confirmed to be very small as previously reported. In contrast, it was found that ZrC-doping largely retards WC grain growth in the case of solid-phase sintering. The retardation of WC grain growth observed in solid-phase sintered alloys was considered to be closely related to a low sinterbility due to a low wettability between Co and ZrC.

Original languageEnglish
Pages (from-to)1096-1101
Number of pages6
JournalMaterials Transactions
Volume50
Issue number5
DOIs
Publication statusPublished - 2009 May
Externally publishedYes

Keywords

  • Cemented carbides
  • Energy dispersive X-ray spectrometry (EDS)
  • Grain growth
  • High-resolution transmission electron microscopy (HRTEM)
  • ZrC

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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