@inproceedings{58d60485472c403d9e6b7049ea9a70fc,
title = "Grain-boundary structure and phase-transformation mechanism in yttria-stabilized tetragonal zirconia polycrystal",
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.",
keywords = "Grain boundary segregation-induced phase transformation, Grain growth, Microstructure, Sintering, Y-TZP",
author = "Koji Matsui and Hidehiro Yoshida and Yuichi Ikuhara",
year = "2007",
month = jan,
day = "1",
doi = "10.4028/0-87849-443-x.921",
language = "English",
isbn = "087849443X",
series = "Materials Science Forum",
publisher = "Trans Tech Publications Ltd",
number = "PART 2",
pages = "921--926",
booktitle = "Recrystallization and Grain Growth III - Proceedings of the Third International Conference on Recrystallization and Grain Growth, ReX and GG III",
edition = "PART 2",
note = "3rd International Conference on Recrystallization and Grain Growth, ReX GG III ; Conference date: 10-06-2007 Through 15-06-2007",
}