Plastic deformation of dense nanocrystalline yttrium oxide at elevated temperatures

Abstract : Nanocrystalline yttrium oxide, Y2O3 with 110 nm average grain size was plastically deformed between 800 ◦C and 1100 ◦C by compression at different strain rates and by creep at different stresses. The onset temperature for plasticity was at 1000 ◦C. Yield stress was strongly temperature dependent and the strain hardening disappeared at 1100 ◦C. The polyhedral and equiaxed grain morphology were preserved in the deformed specimens. The experimentally measured and theoretically calculated stress exponent n = 2 was consistent with the plastic deformation by grain boundary sliding. Decrease in the grain size was consistent with decrease in the brittle to ductile transition temperature.
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Angela Gallardo-López, Arturo Domínguez-Rodríguez, Claude Estournès, Rachel Marder, Rachman Chaim. Plastic deformation of dense nanocrystalline yttrium oxide at elevated temperatures. Journal of the European Ceramic Society, Elsevier, 2012, vol. 32, pp. 3115-3121. ⟨10.1016/j.jeurceramsoc.2012.04.035⟩. ⟨hal-00836868⟩

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