Surface Modification in Polycrystalline Y2O3 Under High-Pressure/High-Temperature Processing Conditions

A pressure‐induced phase transformation is used to refine the grain size of polycrystalline Y2O3, by a factor of 3000. A surface modification effect accompanies the observed grain refinement, which becomes more apparent with increasing holding time under high pressure. The surface‐modified layer exh...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2013-06, Vol.96 (6), p.1966-1971
Main Authors: Al-Sharab, Jafar F., Deutsch, Stuart, Nordahl, Christopher S., Tse, Stephen D., Kear, Bernard H.
Format: Article
Language:English
Subjects:
Ceramics
Columnar structure
Columns (structural)
Crucibles
Dislocation density
Grain refinement
Grain size
Hardness
Imaging
Oxygen content
Plastic deformation
Superplasticity
Symmetry
Yttrium oxide
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Summary:A pressure‐induced phase transformation is used to refine the grain size of polycrystalline Y2O3, by a factor of 3000. A surface modification effect accompanies the observed grain refinement, which becomes more apparent with increasing holding time under high pressure. The surface‐modified layer exhibits lower hardness and lower oxygen content relative to the underlying material. Moreover, it possesses columnar‐grained structure with cubic symmetry, whereas the interior has a monoclinic structure.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.12245