Microstructure and mechanical behaviour characterisation of Al-Al₂O₃ MMC processed by DIMOX and Al-Al₂O₃/MnO₂ MMC processed via stir casting route
by Vikas Verma; Prakash Kumar; Kamal Kumar Mittal; Sandeep Chauhan; P.C. Tewari
International Journal of Materials Engineering Innovation (IJMATEI), Vol. 7, No. 3/4, 2016

Abstract: In the present study two types of composite were developed - Al-Al₂O₃ composite by direct metal oxidation (DIMOX) and by reinforcements using both ex situ and in situ approaches together by a dispersing powder mixture of Al₂O₃ and MnO₂ in a ratio of 1:1, through stir casting route in aluminium matrix. Al-Al₂O₃ composites were synthesised successfully under ambient conditions and it was found that the particles increased as the holding time and the number of stirrings was increased resulting in improved mechanical properties. Generation of Al₂O₃ particles in the matrix was confirmed by X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) examination. Hence, oxidation, which is known as a major problem in composite preparation by liquid metallurgy route, can be used for preparation of composites and for improving the properties. In Al-Al₂O₃/MnO₂ composites the mechanical properties as well as particle distribution improved as Al₂O₃ + MnO₂ were introduced and also with their increasing weight percent.

Online publication date: Mon, 19-Jun-2017

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