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Synthesis of Al-AlN metal matrix composites by nitrogenation

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Abstract

Metal matrix composites containing AlN in aluminium matrices is synthesized using NH4Cl and NH4Cl+CaO powders as sources of nitrogen in molten aluminium in the temperature range of 700 1000°C. Active nitrogen dissociated from ammonia at high temperature is used to form AlN. The addition of CaO to NH4Cl is found to have a more pronounced effect as a nitrogenation agent in comparison with NH4Cl. MMCs synthesized at 700°C and 900°C using NH4Cl+CaO showed the highest hardness of 83 Hv100 (814 MPa). The clustering of AlN nanoparticles at few locations indicate insufficient turbulence of the melt during the chemical reactions of powder with aluminium-melt.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, VNIT, Nagpur, 440 010, India

    Sandeep Fale, Ajay Likhite & Jatin Bhatt

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  1. Sandeep Fale
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  2. Ajay Likhite
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  3. Jatin Bhatt
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Correspondence to Sandeep Fale.

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Fale, S., Likhite, A. & Bhatt, J. Synthesis of Al-AlN metal matrix composites by nitrogenation. Trans Indian Inst Met 64, 111 (2011). https://doi.org/10.1007/s12666-011-0022-8

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  • DOI: https://doi.org/10.1007/s12666-011-0022-8

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