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Abstract

The exact mechanism of creep resistance enhancement due to yttrium (Y) doping in a-alumina is still subject to speculation, although it is known that dopants segregate strongly to grain boundaries. The current work applies atomistic simulation techniques to the study of segregation to a reasonable number of interfaces in Y-doped a-alumina. Y is shown to segregate stronger to surfaces than grain boundaries and to form ordered structures at the interfaces, which may decrease diffusion coefficients. These Y-ordered regions may act as nucleation sites for YAG precipitates particularly for rapid sintering techniques.

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