Directional crystallization of columnar-grained monoclinic Y 2O3 under high pressure

Stuart Deutsch, Jafar F. Al-Sharab, Bernard H. Kear, Stephen D. Tse, Oleg A. Voronov, Christopher S. Nordahl

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A pressure-induced directional crystallization process is described to convert equiaxially-grained cubic Y2O3 into columnar-grained monoclinic Y2O3. The conversion to the columnar-grained structure initiates at the sample surface, propagates into the sample interior and eventually encompasses the entire sample volume. Optimal processing conditions are about 3.0 GPa at 1000 C. It is proposed that the phase transformation from cubic Y2O3 to the higher density monoclinic Y2O3 provides the driving force for columnar grain growth.

Original languageEnglish (US)
Pages (from-to)651-653
Number of pages3
JournalScripta Materialia
Volume69
Issue number9
DOIs
StatePublished - Nov 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

Keywords

  • Directional crystallization
  • Metal and alloys (rare earth)
  • Phase transformation kinetics
  • Polymorphic phase transformation
  • Recrystallization

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