Application of high-pressure torsion to WC-Co ceramic-based composites for improvement of consolidation, microstructure and hardness

Kaveh Edalati, Hideaki Iwaoka, Shoichi Toh, Ken Sasaki, Zenji Horita

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

This study shows that ultrafine-grained composites of WC11 mass% Co are successfully consolidated by high-pressure torsion (HPT) followed by sintering at lower sintering temperatures or shorter sintering time than hot isostatic pressing (HIP) and compression and sintering. For the samples processed by HPT and successive sintering, the grain size (∼700 nm) is smaller and the hardness (∼1700 Hv) is higher when compared to those consolidated by compression and sintering and HIP. A heterogeneous microstructure consisting of nanograins of Co and WC and coarse grains of WC ceramics with high dislocation density, 2 × 1016m-2, is formed during HPT, but the average grain size is slightly increased by subsequent sintering. A W3Co3C carbide forms by sintering, while its fraction increases with increasing the shear strain or with increasing the sintering temperature.

Original languageEnglish
Pages (from-to)1540-1548
Number of pages9
JournalMaterials Transactions
Volume54
Issue number9
DOIs
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

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

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