Cold Consolidation of Metal–Ceramic Nanocomposite Powders with Large Ceramic Fractions

Authors

  • Enric Menéndez,

    1. Departament de Física, Universitat Autònoma de Barcelona 08193 Bellaterra (Spain)
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  • German Salazar-Alvarez,

    1. Institut Català de Nanotecnologia, Edifici CM7 Campus Universitat Autònoma de Barcelona 08193 Bellaterra (Spain)
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  • Alexander P. Zhilyaev,

    1. Centro Nacional de Investigaciones Metalúrgicas (CENIM), CSIC 28040 Madrid (Spain)
    2. Institute for Metals Superplasticity Problems, RAS 450001 Ufa (Russia)
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  • Santiago Suriñach,

    1. Departament de Física, Universitat Autònoma de Barcelona 08193 Bellaterra (Spain)
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  • Maria Dolors Baró,

    1. Departament de Física, Universitat Autònoma de Barcelona 08193 Bellaterra (Spain)
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  • Josep Nogués,

    1. Institució Catalana de Recerca i Estudis Avançats (ICREA) Institut Català de Nanotecnologia, Edifici CM7 Campus Universitat Autònoma de Barcelona 08193 Bellaterra (Spain)
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  • Jordi Sort

    Corresponding author
    1. Institució Catalana de Recerca i Estudis Avançats (ICREA) Departament de Física, Universitat Autònoma de Barcelona 08193 Bellaterra (Spain)
    • Institució Catalana de Recerca i Estudis Avançats (ICREA) Departament de Física, Universitat Autònoma de Barcelona 08193 Bellaterra (Spain).
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  • The authors wish to thank L. Lutterotti for providing the MAUD program and the Servei de Microscòpia of the Universitat Autònoma de Barcelona for its technical assistance during the morphology characterization. The work has been partially financed by the 2005-SGR-00401 and the MAT2007-61629 research projects. E.M. and G.S.-A. acknowledge their FPI and postdoctoral fellowships from the Spanish Ministerio de Educación y Ciencia (co-financed by the ESF) and the Institut Català de Nanotecnologia, respectively.

Abstract

Co/α-Al2O3 powder mixtures (5, 10, 20, 30, 40, and 50 mass % of α-Al2O3) have been ball-milled and, subsequently, consolidated at room temperature by means of a high pressure torsion procedure in order to produce bulk nanostructured composites. For mixtures up to 20% of α-Al2O3, the cold-compaction results in roughly fully dense disks with relatively high microhardness values. However, the compaction for 30, 40, and 50% of α-Al2O3 is less effective, resulting in a reduction of the microhardness although a structure in the nanoscale range is still preserved. A detailed structural investigation has been also performed.

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