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Effect of MoSi2 distribution on room and high temperature mechanical properties of aluminum matrix nanocomposites

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Abstract

Nanocomposites of 2024 aluminum–MoSi2 were prepared using mechanical alloying method followed by cold and hot pressing. Influences of volume fraction and distribution of nanosized MoSi2 reinforcement on mechanical properties of the composites were investigated. Microstructural characterization was carried out by scanning electron microscopy and energy dispersive spectroscopy. Mechanical properties of the nanocomposites were evaluated via hardness, wear, and also room and high temperature compression tests. The results showed that although the distribution of low content of MoSi2 nanoparticles in the matrix is homogeneous, with increasing the reinforcement fraction, the tendency of agglomeration is gradually intensified. The addition of reinforcing particles continuously brings a considerable enhancement in the mechanical properties of the matrix alloy but by exceeding a certain amount of the reinforcement fraction, this improvement reduces mainly because of the microstructure inhomogeneity. In addition, the nanocomposite with 3 vol% MoSi2 exhibits the optimum mechanical properties at ambient temperature.

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Authors and Affiliations

  1. Faculty of Mechanical & Energy Engineering, Shahid Beheshti University, A.C., Tehran, Iran

    Mahmood Sameezadeh

  2. School of Metallurgy and Materials, College of Engineering, University of Tehran, Tehran, Iran

    Masoud Emamy & Hassan Farhangi

Authors
  1. Mahmood Sameezadeh
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  2. Masoud Emamy
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  3. Hassan Farhangi
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Correspondence to Mahmood Sameezadeh.

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Sameezadeh, M., Emamy, M. & Farhangi, H. Effect of MoSi2 distribution on room and high temperature mechanical properties of aluminum matrix nanocomposites. Journal of Materials Research 31, 1741–1747 (2016). https://doi.org/10.1557/jmr.2016.190

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  • DOI: https://doi.org/10.1557/jmr.2016.190

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