Grain-boundary structure and microstructure development mechanism in 2-8 mol% yttria-stabilized zirconia polycrystals

K. Matsui; H. Yoshida; Yuichi Ikuhara

doi:10.1016/j.actamat.2007.11.026

Grain-boundary structure and microstructure development mechanism in 2-8 mol% yttria-stabilized zirconia polycrystals

K. Matsui, H. Yoshida, Yuichi Ikuhara

Research output: Contribution to journal › Article › peer-review

120 Citations (Scopus)

Abstract

Microstructural developments during sintering in 2 and 3 mol% Y₂O₃-stabilized tetragonal zirconia polycrystals (2Y- and 3Y-TZPs) and 8 mol% Y₂O₃-stabilized cubic zirconia (8Y-CSZ) were systematically investigated in the sintering temperature range of 1100-1500 °C. Above 1200 °C, grain growth in 8Y-CSZ was much faster than that in 2Y- and 3Y-TZPs. In the grain-boundary faces in these specimens, amorphous layers did not exist; however, Y³⁺ ions segregated at the grain boundaries over a width of ∼10 nm. The amount of segregated Y³⁺ ions in 8Y-CSZ was significantly less than in 2Y- and 3Y-TZPs. This indicates that 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. The segregation of Y³⁺ ions, which directly affects grain growth, is closely related to the driving force for grain-boundary segregation-induced phase transformation (GBSIPT).

Original language	English
Pages (from-to)	1315-1325
Number of pages	11
Journal	Acta Materialia
Volume	56
Issue number	6
DOIs	https://doi.org/10.1016/j.actamat.2007.11.026
Publication status	Published - 2008 Apr 1

Keywords

Grain growth
Grain-boundary segregation-induced phase transformation
Microstructure
Sintering
Yttria-stabilized zirconia polycrystal

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2007.11.026

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title = "Grain-boundary structure and microstructure development mechanism in 2-8 mol% yttria-stabilized zirconia polycrystals",

abstract = "Microstructural developments during sintering in 2 and 3 mol% Y2O3-stabilized tetragonal zirconia polycrystals (2Y- and 3Y-TZPs) and 8 mol% Y2O3-stabilized cubic zirconia (8Y-CSZ) were systematically investigated in the sintering temperature range of 1100-1500 °C. Above 1200 °C, grain growth in 8Y-CSZ was much faster than that in 2Y- and 3Y-TZPs. In the grain-boundary faces in these specimens, amorphous layers did not exist; however, Y3+ ions segregated at the grain boundaries over a width of ∼10 nm. The amount of segregated Y3+ ions in 8Y-CSZ was significantly less than in 2Y- and 3Y-TZPs. This indicates that 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. The segregation of Y3+ ions, which directly affects grain growth, is closely related to the driving force for grain-boundary segregation-induced phase transformation (GBSIPT).",

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N2 - Microstructural developments during sintering in 2 and 3 mol% Y2O3-stabilized tetragonal zirconia polycrystals (2Y- and 3Y-TZPs) and 8 mol% Y2O3-stabilized cubic zirconia (8Y-CSZ) were systematically investigated in the sintering temperature range of 1100-1500 °C. Above 1200 °C, grain growth in 8Y-CSZ was much faster than that in 2Y- and 3Y-TZPs. In the grain-boundary faces in these specimens, amorphous layers did not exist; however, Y3+ ions segregated at the grain boundaries over a width of ∼10 nm. The amount of segregated Y3+ ions in 8Y-CSZ was significantly less than in 2Y- and 3Y-TZPs. This indicates that 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. The segregation of Y3+ ions, which directly affects grain growth, is closely related to the driving force for grain-boundary segregation-induced phase transformation (GBSIPT).

AB - Microstructural developments during sintering in 2 and 3 mol% Y2O3-stabilized tetragonal zirconia polycrystals (2Y- and 3Y-TZPs) and 8 mol% Y2O3-stabilized cubic zirconia (8Y-CSZ) were systematically investigated in the sintering temperature range of 1100-1500 °C. Above 1200 °C, grain growth in 8Y-CSZ was much faster than that in 2Y- and 3Y-TZPs. In the grain-boundary faces in these specimens, amorphous layers did not exist; however, Y3+ ions segregated at the grain boundaries over a width of ∼10 nm. The amount of segregated Y3+ ions in 8Y-CSZ was significantly less than in 2Y- and 3Y-TZPs. This indicates that 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. The segregation of Y3+ ions, which directly affects grain growth, is closely related to the driving force for grain-boundary segregation-induced phase transformation (GBSIPT).

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KW - Grain-boundary segregation-induced phase transformation

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KW - Sintering

KW - Yttria-stabilized zirconia polycrystal

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Grain-boundary structure and microstructure development mechanism in 2-8 mol% yttria-stabilized zirconia polycrystals

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