Elastic Moduli and Strength of Nanocrystalline Cubic BC2N from X-ray Diffraction Under Nonhydrostatic Compression
The stress behavior of nanocrystalline cubic boron carbon nitride (c-BC2N) was investigated using radial and axial x-ray diffractions in the diamond-anvil cell under nonhydrostatic compression up to {approx}100 GPa. The radial x-ray diffraction (RXRD) data yield a bulk modulus K0=276{+-}20 GPa with a fixed pressure derivative K0{prime}=3.4 at {psi}=54.7, 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-BC2N sample could support a maximum differential stress of {approx}38 GPa when it started to yield at {approx}66 GPa under uniaxial compression. Moreover, the aggregate elastic moduli of the nanocrystalline c-BC2N have been determined from the RXRD data at high pressures.
- Research Organization:
- Brookhaven National Laboratory (BNL) National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 980174
- Report Number(s):
- BNL--93092-2010-JA
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Vol. 79; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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