Grain-boundary structure and phase-transformation mechanism in yttria-stabilized tetragonal zirconia polycrystal

Koji Matsui, Hidehiro Yoshida, Yuichi Ikuhara

研究成果: Conference contribution

抄録

The microstructures in 3 mol% Y2O3-stabilized tetragonal zirconia polycrystal (Y-TZP) sintered at 1100°-1650°C were investigated to clarify cubic-formation and grain-growth mechanisms. The cubic phase in Y-TZP appeared at 1300°C and its mass fraction increased with increasing sintering temperature. High-resolution transmission electron microscopy (HRTEM) and nanoprobe X-ray energy dispersive spectroscopy (EDS) measurements revealed that no amorphous layer existed along the grain-boundary faces in Y-TZP, and Y3+ ions segregated not only along the tetragonal-tetragonal phase boundaries but also along tetragonal-cubic phase boundaries. Scanning transmission electron microscopy (STEM) and nanoprobe EDS measurements revealed that the Y3+ ion distribution was nearly homogeneous up to 1300°C, but cubic phase regions with high Y3+ ion concentration clearly formed inside grains at 1500°C These results indicate that cubic phase regions are formed from the grain boundaries and/or the multiple junctions in which Y3+ ions segregated. We termed such a new diffusive transformation phenomenon "grain boundary segregation-induced phase transformation (GBSIPT)". The grain-growth mechanism is controlled by the solute-drag effect of Y3+ ions segregating along the grain boundary.

本文言語English
ホスト出版物のタイトルRecrystallization and Grain Growth III - Proceedings of the Third International Conference on Recrystallization and Grain Growth, ReX and GG III
出版社Trans Tech Publications Ltd
ページ921-926
ページ数6
PART 2
ISBN(印刷版)087849443X, 9780878494439
DOI
出版ステータスPublished - 2007 1 1
外部発表はい
イベント3rd International Conference on Recrystallization and Grain Growth, ReX GG III - Jeju Island, Korea, Republic of
継続期間: 2007 6 102007 6 15

出版物シリーズ

名前Materials Science Forum
番号PART 2
558-559
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Other

Other3rd International Conference on Recrystallization and Grain Growth, ReX GG III
CountryKorea, Republic of
CityJeju Island
Period07/6/1007/6/15

ASJC Scopus subject areas

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

フィンガープリント 「Grain-boundary structure and phase-transformation mechanism in yttria-stabilized tetragonal zirconia polycrystal」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル