Formation of microcracks in cubic boron nitride

M. Aki, Y. Ohno, H. Kohno, S. Takeda

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We have found that microcracks are formed in a cubic boron nitride crystal, grown by a hot-press method, by annealing at temperatures above 673 K. Analyses of the data obtained by transmission electron microscopy and diffraction have shown that these microcracks do not extend on the most easily cleaved {110}-type planes but do extend on {lll}-type planes. The electron- energy-loss spectroscopy data have indicated that the microcracks are formed by the condensation of excess nitrogen atoms into the {111}-type planes. We have shown that a microcrack originates from the segment of a 60° dislocation, and it extends to the dilation side of the dislocation; that is the habit plane of the microcrack is not the glide plane of the dislocation.

Original languageEnglish
Pages (from-to)747-758
Number of pages12
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume80
Issue number3
DOIs
Publication statusPublished - 2000 Mar

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys

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