Surface Modification in Polycrystalline Y2O3 Under High‐Pressure/High‐Temperature Processing Conditions |
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| Authors: | Jafar F. Al‐Sharab Stuart Deutsch Christopher S. Nordahl Stephen D. Tse Bernard H. Kear |
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| Affiliation: | 1. Center for Nanomaterials Research, Rutgers University, , Piscataway, New Jersey 08854;2. Department of Mechanical & Aerospace Engineering, Polytechnic Institute of New York University (NYU‐Poly), Six MetroTech Center, , Brooklyn, New York 11201;3. Raytheon IDS, , Andover, Massachusetts 01810 |
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| Abstract: | 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. |
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