Grain boundary segregation-induced phase transformation and grain growth in Y2O3-stabilized ZrO2 polycrystals

Koji Matsui, Hidehiro Yoshida, Yuichi Ikuhara

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

    Abstract

    We systematically investigated the phase- Transformation and grain-growth behaviors during sintering in 2 and 3 mol% Y2O3-stabilized tetragonal ZrO2 (2Y and 3Y) and 8 mol% Y2O 3-stabilized cubic ZrO2 polycrystals (8Y). In particular, grain-boundary segregation and grain-interior distribution of Y3+ ions were examined by high-resolution transmission electron microscopy (HRTEM)- And scanning transmission electron microscopy (STEM)-nanoprobe X-ray energy dispersive spectroscopy (EDS) techniques. Above 1200°C, grain growth during sintering in 8Y was much faster than that in 2Y and 3Y. In the grain boundaries in these specimens, amorphous layers did not present; however, Y3+ ions segregated at the grain boundaries over a width of about 10 nm. The amount of segregated Y3+ ions in 8Y was significantly less than in 2Y and 3Y. This indicates that the amount of segregated Y3+ ions is related to grain growth behavior; i.e., an increase in segregated Y3+ ions retards grain growth. Therefore, grain-growth behavior during sintering can be reasonably explained by the solute-drag mechanism of Y3+ ions segregating along the grain boundary. In 2Y and 3Y, the cubic-phase regions were formed in grain interiors adjacent to the grain boundaries and/or the multiple junctions in which Y3+ ions segregated, which can be explained by a grain boundary segregation-induced phase transformation (GBSIPT) mechanism.

    Original languageEnglish
    Title of host publicationAdvanced Ceramics and Novel Processing
    PublisherTrans Tech Publications Ltd
    Pages8-13
    Number of pages6
    ISBN (Print)9783038351306
    DOIs
    Publication statusPublished - 2014
    Event5th International Symposium on Advanced Ceramics, ISAC 2013 and 3rd International Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2013 - Wuhan, China
    Duration: 2013 Dec 92013 Dec 12

    Publication series

    NameKey Engineering Materials
    Volume616
    ISSN (Print)1013-9826
    ISSN (Electronic)1662-9795

    Other

    Other5th International Symposium on Advanced Ceramics, ISAC 2013 and 3rd International Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2013
    CountryChina
    CityWuhan
    Period13/12/913/12/12

    Keywords

    • Grain boundary segregation-induced phase transformation
    • Grain growth
    • Grain-boundary segregation
    • Microstructure
    • Sintering
    • YSZ

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

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