Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1530887 | Materials Science and Engineering: B | 2008 | 4 Pages |
Abstract
The deformation of equiaxed dense β-SiAlON polycrystals with an average grain size of 0.83 μm was investigated by compression tests at temperatures ranging from 1823 K to 1973 K. The β-SiAlON ceramics were fabricated from β-SiAlON nano-powder (Si3Al3O3N5) using the Spark-Plasma Sintering technique without additives. The sintered body contained almost no intergranular phase. The deformation was characterized by stress exponent n â¼Â 1 in the higher stress region and n â¼Â 2 in the lower stress region. The observed values of stress exponent and activation energy, Q â¼Â 940 kJ/mol, in the higher stress region were close to those of a SiAlON, which was fully crystallized by annealing for a long time. The possible deformation mechanism of β-SiAlON was attributed to diffusion-related mechanisms, such as grain boundary sliding accommodated by diffusional creep.
Related Topics
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Materials Science
Electronic, Optical and Magnetic Materials
Authors
Kentarou Chihara, Daisuke Hiratsuka, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai, Junichi Tatami, Katsutoshi Komeya,