Superplastic behavior of fine-grained β-silicon nitride material under compression

Guo Dong Zhan, Mamoru Mitomo, Toshiyuki Nishimura, Rong Jun Xie, Taketo Sakuma, Yuichi Ikuhara

    Research output: Contribution to journalArticle

    42 Citations (Scopus)

    Abstract

    The deformation behavior of a hot-pressed, fine-grained β-Si3N4 ceramic was investigated in the temperature range 1450°-1650 °C, under compression, and the results for strain rate and temperature dependence of the flow stress are presented here. The present results show that the material is capable of high rates of deformation (approximately 10-4-10-3s-1) within a wide range of deformation temperatures and under a pressure of 5-100 MPa; no strain hardening occurs in the material, even at slow deformation rates, because of its stable microstructure; Newtonian flow occurs, with a stress exponent of approximately unity; and the material has activation energy values for flow in the range 344-410 kJ·mol-1. Grain-boundary sliding and grain rotation, accommodated by viscous flow, might be the mechanisms of superplasticity for the present material.

    Original languageEnglish
    Pages (from-to)841-847
    Number of pages7
    JournalJournal of the American Ceramic Society
    Volume83
    Issue number4
    DOIs
    Publication statusPublished - 2000

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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