Grain Boundary Nanostructure and High Temperature Plastic Flow in Polycrystalline Oxide Ceramics

Hidehiro Yoshida; Koji Morita; Byung Nam Kim; Keijiro Hiraga

doi:10.4028/www.scientific.net/MSF.638-642.1731

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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Grain Boundary Nanostructure and High Temperature...

Grain Boundary Nanostructure and High Temperature Plastic Flow in Polycrystalline Oxide Ceramics

Abstract:

High temperature creep and superplastic flow in high-purity, polycrystalline oxide ceramics is very sensitive to a small amount of doping by various oxides. The doping effect is attributed to change in grain boundary diffusivity owing to grain boundary segregation of the doped cations. The doping effect on the grain boundary diffusivity is caused mainly by change of chemical bonding state in the vicinity of the grain boundary segregated with the doped cations. In other words, controlling of grain boundary nanostructure based on the doping process will be a useful way to develop new high-performance functional ceramics in the near future.

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Periodical:

Materials Science Forum (Volumes 638-642)

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1731-1736

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https://doi.org/10.4028/www.scientific.net/MSF.638-642.1731

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Online since:

January 2010

Authors:

Hidehiro Yoshida, Koji Morita, Byung Nam Kim, Keijiro Hiraga

Keywords:

Ceramic, Creep, Diffusion, Grain Boundary, Superplasticity

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