Dynamic compressive failure of AlON under controlled planar confinement

Bhasker Paliwal, Kaliat T. Ramesh, James W. McCauley, Mingwei Chen

    研究成果: Article

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    An experimental technique is developed to impose a planar lateral confinement in a prismatic specimen (with a rectangular cross section); the setup enabled a controlled and homogeneous stress state with high lateral compressive stresses. A transparent polycrystalline aluminum oxynitride (AlON) specimen was used for the study. The statically precompressed specimen was then subjected to axial dynamic compressive loading using a modified compression Kolsky bar setup. Experimental design was performed using 3D computational modeling. Initial exploratory experiments were conducted on AlON at an average planar confinement of 400-410 MPa; the results suggested a higher compressive strength and a nonlinear stress evolution in AlON due to the confinement. A high-speed camera was used to observe the damage evolution in the specimen during the course of loading. The photographs and stress evolution are suggestive of an additional inelastic deformation mechanism, whose evolution is slower than the typical brittle-cracking type of damage apparent in the unconfined case. The TEM and high-resolution electron microscope analysis indicated dislocation plasticity in some fragments; dislocations in the slip bands were characterized to be dissociated 〈110〉 dislocations on {111} planes. The width between two partial dislocations was about 15 nm, suggesting low stacking fault energy of AlON. Microscopic characterization also shows that the eventual fragmentation of AlON is by cleavage mainly along low-index {111} planes.

    元の言語English
    ページ(範囲)3619-3629
    ページ数11
    ジャーナルJournal of the American Ceramic Society
    91
    発行部数11
    DOI
    出版物ステータスPublished - 2008 11 1

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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