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Grain growth stagnation in fully dense nanocrystalline Y2O3 by spark plasma sintering

Marder, Rachel and Chaim, Rachman and Estournès, Claude Grain growth stagnation in fully dense nanocrystalline Y2O3 by spark plasma sintering. (2010) Materials Science and Engineering A, vol. 527 (n° 6). pp. 1577-1585. ISSN 0921-5093

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Official URL: http://dx.doi.org/10.1016/j.msea.2009.11.009

Abstract

Nanocrystalline (nc) Y2O3 powders with 18nmcrystallite size were sintered using spark plasma sintering (SPS) at 1100 ◦C and 100MPa for different durations. Specimens with 98% density and 106±33nm mean grain size were formed after 20 min. The grain size at the final stage of sintering first increased and then tended to stagnation with the SPS duration. The nanostructure consisted of convex tetrahedron shaped nano-pores at part of the grain boundary junctions. Theoretical calculations were made for grain growth stagnation imposed by either drag from nano-pores at grain junctions or from dense triple junctions; the experimental results were in agreement with grain growth stagnation due to nano-pore drag in nc-Y2O3. The conditions for the stabilization of the nanostructure in Y2O3 were determined. Extended SPS duration up to 40 min led to sudden grain coarsening and loss of the nanocrystalline character.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Materials Science and Engineering: A website : http://www.sciencedirect.com/science/journal/09215093
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Technion – Israel Institute of Technology (ISRAEL)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By: Nihad Lahdifi

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