Elastic moduli and strength of nanocrystalline cubic BC2N from x-ray diffraction under nonhydrostatic compression

Haini Dong, Duanwei He, Thomas S. Duffy, Yusheng Zhao

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

The stress behavior of nanocrystalline cubic boron carbon nitride (c -BC2 N) was investigated using radial and axial x-ray diffractions in the diamond-anvil cell under nonhydrostatic compression up to ∼100 GPa. The radial x-ray diffraction (RXRD) data yield a bulk modulus K0 =276±20 GPa with a fixed pressure derivative K0′ =3.4 at ψ=54.7deg;, which corresponds to the hydrostatic compression curve. The bulk modulus obtained from axial x-ray diffraction (AXRD) gives a value of 420±11 GPa. A comparative study of the observed compression curves from radial and axial diffractions shows that the ruby-fluorescence pressure scale may reflect the maximum stress under nonhydrostatic compression. It was found that nanocrystalline c -BC2 N sample could support a maximum differential stress of ~38 GPa when it started to yield at ~66 GPa under uniaxial compression. Moreover, the aggregate elastic moduli of the nanocrystalline c -BC2 N have been determined from the RXRD data at high pressures.

Original languageEnglish (US)
Article number014105
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number1
DOIs
StatePublished - Jan 5 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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