High-temperature tensile ductility and crack growth in alumina-spinel ceramics

Yorinobu Takigawa, Yuichi Ikuhara, Taketo Sakuma

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    High-temperature tensile ductility of Al2O3 is much enhanced by spinel (MgO·1.5Al2O3) dispersion. However, the enhanced tensile ductility in Al2O3-20vol%spinel cannot be explained solely from grain size stability or reduction of flow stress. Detailed microstructural analysis reveals that the crack-like cavity growth rate during high-temperature deformation is more sluggish in Al2O3-20vol%spinel than in 0.1wt%MgO-doped single-phase Al2O3. The enhanced tensile ductility in Al2O3-20vol%spinel must be explained from the reduction of crack-like cavity growth rate during deformation. Since the grain boundaries in Al2O3-20vol%spinel mainly consist of Al2O3 grain boundaries and Al2O3/spinel interphase boundaries, the origin of the sluggish crack-like cavity growth in Al2O3-20vol%spinel is due to high resistivity against crack growth in Al2O3/spinel boundaries. Detailed TEM analysis clarifies that there is an epitaxial relationship between Al2O3 and spinel grains in many Al2O3/spinel interphase boundaries. These interphase boundaries are expected to have smaller interfacial energy, which must act to retard the crack-like cavity growth in spinel dispersed Al2O3.

    Original languageEnglish
    Pages (from-to)1369-1373
    Number of pages5
    JournalZairyo/Journal of the Society of Materials Science, Japan
    Volume46
    Issue number12
    DOIs
    Publication statusPublished - 1997 Jan 1

    Keywords

    • AlO-spinel
    • Crack-like cavity growth
    • Interphase boundary
    • Superplasticity
    • Tensile ductility

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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