Microstructure formation of Al2O3-HfO2 eutectic

Kyosuke Seya, Byungkoog Jang, Shunkichi Ueno

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The microstructure formation of Al2O3-HfO2 eutectic prepared by unidirectional solidification and rapid solidification was examined. The microstructure of the Al2O3-HfO2 eutectic samples showed lamellar structure and the relationship between the inter-lamellar spacing λ and solidification rate R can be expressed by λ2R=constant. A small amount of tetragonal HfO2 phase exists in the sample prepared by rapid solidification. Only monoclinic HfO2 phase can be found in the eutectic samples prepared by unidirectional solidification. A tensile stress was induced in Al2O3 phase during the cooling step due to the transformation of HfO2 from tetragonal to monoclinic phase. The tensile stress of the Al2O3 phase in the eutectic structure was estimated to 420 MPa.

Original languageEnglish
Pages (from-to)433-436
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume123
Issue number1437
DOIs
Publication statusPublished - Jan 1 2015
Externally publishedYes

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eutectics
Eutectics
solidification
Solidification
rapid solidification
microstructure
Microstructure
Rapid solidification
tensile stress
Tensile stress
Lamellar structures
spacing
Cooling
cooling

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Microstructure formation of Al2O3-HfO2 eutectic. / Seya, Kyosuke; Jang, Byungkoog; Ueno, Shunkichi.

In: Journal of the Ceramic Society of Japan, Vol. 123, No. 1437, 01.01.2015, p. 433-436.

Research output: Contribution to journalArticle

Seya, Kyosuke ; Jang, Byungkoog ; Ueno, Shunkichi. / Microstructure formation of Al2O3-HfO2 eutectic. In: Journal of the Ceramic Society of Japan. 2015 ; Vol. 123, No. 1437. pp. 433-436.
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