Exaggerated texture and grain growth in a superplastic SiAlON

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb05497.x· OSTI ID:6858686

Wu, X; Chen, I W ^[1]

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1. Michigan Univ., Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

This paper reports on a fine-grained superplastic [beta]-silicon nitride solid solution (SiAlON) which was found to develop elongated grains and a pronounced texture during tensile deformation at 1550[degrees] 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 stress-strain 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, the authors are able to simulate the deformation behavior.

• OSTI ID: 6858686
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:10; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALIGNMENT
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTAL MODELS
CRYSTAL STRUCTURE
DEFORMATION
DISPERSIONS
GLASS
GRAIN SIZE
HARDENING
MATHEMATICAL MODELS
MATRIX ELEMENTS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MIXTURES
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLASTICITY
PNICTIDES
RHEOLOGY
SILICON COMPOUNDS
SILICON NITRIDES
SIZE
SOLID SOLUTIONS
SOLUTIONS
STRAIN HARDENING
STRAINS
STRESSES
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TENSILE PROPERTIES
TEXTURE