Improvement of high-temperature creep resistance in fine-grained Al2O3 by Zr4+ segregation in grain boundaries

H. Yoshida; K. Okada; Y. Ikuhara; T. Sakuma

doi:10.1080/095008397179327

Improvement of high-temperature creep resistance in fine-grained Al₂O₃ by Zr⁴⁺ segregation in grain boundaries

H. Yoshida, K. Okada, Y. Ikuhara, T. Sakuma

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

68 Citations (Scopus)

Abstract

The high-temperature creep resistance in Al₂O₃ is improved greatly by ZrO₂ doping. Zirconium ions are found to be segregated in Al₂O₃ grain boundaries. The activation energies for creep in high-purity Al₂O₃ and ZrO₂-doped Al₂O₃ are estimated to be 430 and 650 kJ mol^-1 respectively. The grain boundary diffusivity of Al ions is expected to be reduced by the segregation of Zr⁴⁺ in the grain boundaries.

Original language	English
Pages (from-to)	9-14
Number of pages	6
Journal	Philosophical Magazine Letters
Volume	76
Issue number	1
DOIs	https://doi.org/10.1080/095008397179327
Publication status	Published - 1997 Jul

ASJC Scopus subject areas

Condensed Matter Physics

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10.1080/095008397179327

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abstract = "The high-temperature creep resistance in Al2O3 is improved greatly by ZrO2 doping. Zirconium ions are found to be segregated in Al2O3 grain boundaries. The activation energies for creep in high-purity Al2O3 and ZrO2-doped Al2O3 are estimated to be 430 and 650 kJ mol-1 respectively. The grain boundary diffusivity of Al ions is expected to be reduced by the segregation of Zr4+ in the grain boundaries.",

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AU - Sakuma, T.

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AB - The high-temperature creep resistance in Al2O3 is improved greatly by ZrO2 doping. Zirconium ions are found to be segregated in Al2O3 grain boundaries. The activation energies for creep in high-purity Al2O3 and ZrO2-doped Al2O3 are estimated to be 430 and 650 kJ mol-1 respectively. The grain boundary diffusivity of Al ions is expected to be reduced by the segregation of Zr4+ in the grain boundaries.

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Improvement of high-temperature creep resistance in fine-grained Al₂O₃ by Zr⁴⁺ segregation in grain boundaries

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