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

Koji Matsui, Hidehiro Yoshida, Yuichi Ikuhara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationRecrystallization and Grain Growth III - Proceedings of the Third International Conference on Recrystallization and Grain Growth, ReX and GG III
PublisherTrans Tech Publications Ltd
Pages921-926
Number of pages6
EditionPART 2
ISBN (Print)087849443X, 9780878494439
DOIs
Publication statusPublished - 2007 Jan 1
Externally publishedYes
Event3rd International Conference on Recrystallization and Grain Growth, ReX GG III - Jeju Island, Korea, Republic of
Duration: 2007 Jun 102007 Jun 15

Publication series

NameMaterials Science Forum
NumberPART 2
Volume558-559
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

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

Keywords

  • Grain boundary segregation-induced phase transformation
  • Grain growth
  • Microstructure
  • Sintering
  • Y-TZP

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Grain-boundary structure and phase-transformation mechanism in yttria-stabilized tetragonal zirconia polycrystal'. Together they form a unique fingerprint.

  • Cite this

    Matsui, K., Yoshida, H., & Ikuhara, Y. (2007). Grain-boundary structure and phase-transformation mechanism in yttria-stabilized tetragonal zirconia polycrystal. In Recrystallization and Grain Growth III - Proceedings of the Third International Conference on Recrystallization and Grain Growth, ReX and GG III (PART 2 ed., pp. 921-926). (Materials Science Forum; Vol. 558-559, No. PART 2). Trans Tech Publications Ltd. https://doi.org/10.4028/0-87849-443-x.921