Exaggerated Texture and Grain Growth in a Supperplastic SiAlON
作者:
Xin Wu,
I‐Wei Chen,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 10
页码: 2733-2741
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb05497.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
A fine‐grained superplastic β′‐silicon nitride solid solution (SiAlON) was found to develop elongated grains and a pronounced texture during tensile deformation at 1550°C. The texture development is well‐described by a geometrical model of grain rotation in accordance with the strain field. Once aligned, grains can then grow with little constraint due to impingement and often coalesce into each other. With the above microstructural development, the stressstrain curve displayed unusually strong strain hardening characteristics due to a fiber–reinforcement effect of the aligned silicon nitride grains on the glass–containing matrix. By extending the rheological model of Chen and Yoon and considering these microstructural evolutions, we are able to simulate the deforma
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