Directional crystallization of columnar-grained monoclinic Y2O3 under high pressure

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 en...

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Bibliographic Details
Published in:Scripta materialia 2013-11, Vol.69 (9), p.651-653
Main Authors: Deutsch, Stuart, Al-Sharab, Jafar F., Kear, Bernard H., Tse, Stephen D., Voronov, Oleg A., Nordahl, Christopher S.
Format: Article
Language:English
Subjects:
Columns (process)
Columns (structural)
Conversion
Crystallization
Density
Directional crystallization
Driving conditions
Metal and alloys (rare earth)
Optimization
Phase transformation kinetics
Polymorphic phase transformation
Recrystallization
Yttrium oxide
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Description
Summary: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 3.0GPa 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.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2013.07.021