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Ductile-to-brittle Transition in Superplastic Silicon Nitride Ceramics

Published online by Cambridge University Press:  31 January 2011

Guo-Dong Zhan
Affiliation:
National Institute for Materials Science, 1–1, Namiki, Tsukuba-shi, Ibaraki 305–0044, Japan
Mamoru Mitomo
Affiliation:
National Institute for Materials Science, 1–1, Namiki, Tsukuba-shi, Ibaraki 305–0044, Japan
Rong-Jun Xie
Affiliation:
National Institute for Materials Science, 1–1, Namiki, Tsukuba-shi, Ibaraki 305–0044, Japan
Keiji Kurashima
Affiliation:
National Institute for Materials Science, 1–1, Namiki, Tsukuba-shi, Ibaraki 305–0044, Japan
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Abstract

The ductile-to-brittle transition was observed in a superplastic silicon nitride nanoceramic. This transition depends on strain rates and deformation temperatures. Generally, the material exhibits ductility at low strain rates and high deformation temperatures. At 1600 °C, the material is brittle when the strain rates are higher than 10−3/s. At a fixed strain rate of 10−3/s, the material exhibits brittleness when the temperatures are lower than 1550 °C. Moreover, critical strain rate for the brittle to ductile transition depends on deformation temperature. The critical strain rates increase with increases in the deformation temperature. When the deformation temperature is 1700 °C, the critical strain rates reach a maximum at 10−2/s. The extent of superplastic deformation in the present material was found to be limited not by intergranular cavitation but by the initiation and growth of surface cracks.

Type
Articles
Copyright
Copyright © Materials Research Society 2002

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