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Preferred orientation of beta-phase and its mechanisms in a fine-grained silicon-nitride-based ceramic

Published online by Cambridge University Press:  31 January 2011

Rong-Jun Xie*
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba-shi, Ibaraki 305–0044, Japan
Mamoru Mitomo
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba-shi, Ibaraki 305–0044, Japan
Wonjoong Kim
Affiliation:
Department of Materials Science and Engineering, The University of Seoul, Seoul 130–743, Korea
Young-Wook Kim
Affiliation:
Department of Materials Science and Engineering, The University of Seoul, Seoul 130–743, Korea
Guo-Dong Zhan
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba-shi, Ibaraki 305–0044, Japan
*
a)Address all correspondence to this author. e-mail: rjxie@nirim.go.jp
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Abstract

A quantitative texture analysis, including calculations of the orientation distribution function, is applied to investigate the preferred orientation of β–Si3N4 in a fine-grained material containing almost equiaxed grains that has been hot-pressed, annealed, and plane-strain compressed. The results show that (i) plane strain compression can produce relatively strong textures that were dependent on the compressive strain; (ii) the basal plane of hexagonal β–Si3N4 was normal to the hot-pressing direction for the hot-pressed and annealed samples, whereas it was parallel to the stress axis for deformed samples; and (iii) the mechanisms for texture development were preferred grain growth for the annealed sample and grain rotation for the hot-pressed and deformed samples, respectively.

Type
Articles
Copyright
Copyright © Materials Research Society 2001

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References

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