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Superplasticity of Non-Oxide Ceramics

Published online by Cambridge University Press:  16 February 2011

Fumihiro Wakai ,
Yasuharu Kodama ,
Shuji Sakaguchi ,
Norimitu Murayama ,
Kansei Izaki  and
Koichi Niihara
Fumihiro Wakai
Affiliation:
Government Industrial Research Institute, Nagoya 1–1 Hirate-cho, Kita-ku, Nagoya 462, Japan
Yasuharu Kodama
Affiliation:
Government Industrial Research Institute, Nagoya 1–1 Hirate-cho, Kita-ku, Nagoya 462, Japan
Shuji Sakaguchi
Affiliation:
Government Industrial Research Institute, Nagoya 1–1 Hirate-cho, Kita-ku, Nagoya 462, Japan
Norimitu Murayama
Affiliation:
Government Industrial Research Institute, Nagoya 1–1 Hirate-cho, Kita-ku, Nagoya 462, Japan
Kansei Izaki
Affiliation:
Mitsubishi Gas Chemical Company Inc. 182 Shinwari, Tayuhama, Niigata 950–31, Japan
Koichi Niihara
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8–1 Mihogaoka, Ibaraki 567, Japan
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Abstract

Superplasticity is a mode of deformation for fine-grained polycrystalline solids at elevated temperatures: included are metals, ionic polycrystals (e.g. oxides) and covalent polycrystals (e.g. non-oxide ceramics). Plastic deformation of covalent crystals by dislocation glide is not easy because of their high Peierls force. This paper describes high ductilities in Si3N4 and SiC, and also reports superplastic elongations in Si3N4/SiC composite.

Fine-grained Si3N4/SiC composites (20 wt% SiC) were fabricated by hot-pressing amorphous Si-C-N powder with 6 wt% Y2O3 and 2 wt% A12O3 as sintering aids. The composites were composed of equiaxed grains (<200 nm) and elongated grains. A composite exhibited a superplastic elongation larger than 150 % at 1600 °C and at an initial strain rate of 4 × 10−5 s−1. The superplasticity of the composite is probably related to the presence of an intergranular liquid phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 196: Symposium T – Superplasticity in Metals, Ceramics, and Intermetallics , 1990 , 349
Copyright
Copyright © Materials Research Society 1990

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