Mechanochemical Synthesis and Rapid Consolidation of Nanocrystalline Al<sub>2</sub>O<sub>3</sub>–2.25Co Composite by High-Frequency Induction Heating and Its Mechanical Properties

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  • Park Na-Ra
    Division of Advanced Materials Engineering, Research Center of Advanced Materials Development, Chonbuk National University
  • Shon In-Jin
    Division of Advanced Materials Engineering, Research Center of Advanced Materials Development, Chonbuk National University

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Other Title
  • Mechanochemical Synthesis and Rapid Consolidation of Nanocrystalline Al₂O₃-2.25Co Composite by High-Frequency Induction Heating and Its Mechanical Properties
  • Mechanochemical Synthesis and Rapid Consolidation of Nanocrystalline Al<sub>2</sub>O<sub>3</sub>&ndash;2.25Co Composite by High-Frequency Induction Heating and Its Mechanical Properties

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Description

This study focused on synthesizing nanopowders of Co and Al2O3 from Co3O4 and Al powders and fabricating nanocrystalline Al2O3 reinforced Co composite to improve its mechanical properties. Nanopowders of Co and Al2O3 were synthesized from Co3O4 and Al by high-energy ball milling. A highly dense nanostructured 2.25Co–Al2O3 composite was consolidated by high-frequency induction heated sintering method within 3 min from the mechanically synthesized powders (2.25Co–Al2O3) under the 80 MPa pressure. The advantage of this process is that it allows for very quick densification to near theoretical density and prohibits grain growth in nanostructured materials. The grain sizes of Co and Al2O3 in the composite were calculated. And the average hardness and fracture toughness values of nanostuctured Co–Al2O3 composite were investigated.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 54 (6), 1049-1052, 2013

    The Japan Institute of Metals and Materials

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