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• W652199103 abstract "High-temperature plastic deformation characteristics such as flow stress and elongation to failure in polycrystalline Al2O3 with an average grain size of about 1 micron is remarkably changed by the doping of 0.1 mol% YO1.5, SiO2, TiO2 or ZrO2 at 1400°C under an initial strain rate of 1.2×10−4 s−1. The difference in the flow stress and the tensile ductility is considered to be originated from change in the grain boundary chemistry in Al2O3 due to segregation of the dopant cation in the vicinity of the grain boundary. A change in the chemical bonding state in the cations-doped Al2O3 is examined by first-principle molecular orbital calculations using DV-Xα method based on [Al5O21]27− cluster model. Chemical shift observed in electron energy-loss spectra (EELS) at the grain boundary due to the dopant segregation can be roughly reproduced by the molecular orbital calculations. A correlation is found between the flow stress and product of net charges of aluminum and oxygen ions. Moreover, the tensile elongation to failure seems to correlate with bond overlap population between Al and O. The change in the chemical bonding strength at the grain boundary must dominantly affect to the grain boundary diffusion and bond strength at the grain boundary, and thus seems to be an important factor to determine the plastic flow behavior in polycrystalline Al2O3." @default.
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• W652199103 date "2002-01-01" @default.
• W652199103 modified "2023-10-01" @default.
• W652199103 title "Effect of Chemical Bonding State on High-temperature Plastic Flow Behavior in Fine-grained, Polycrystalline Cation-doped Al<SUB>2</SUB>O<SUB>3</SUB>" @default.
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• W652199103 doi "https://doi.org/10.2320/matertrans.43.1566" @default.
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