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

Published online by Cambridge University Press:  27 June 2016

Mahmood Sameezadeh Open the ORCID record for Mahmood Sameezadeh [Opens in a new window] ,
Masoud Emamy  and
Hassan Farhangi
Mahmood Sameezadeh*
Affiliation:
Faculty of Mechanical & Energy Engineering, Shahid Beheshti University, A.C., Tehran, Iran
Masoud Emamy
Affiliation:
School of Metallurgy and Materials, College of Engineering, University of Tehran, Tehran, Iran
Hassan Farhangi
Affiliation:
School of Metallurgy and Materials, College of Engineering, University of Tehran, Tehran, Iran
*
a)Address all correspondence to this author. e-mail: [email protected]
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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.

Keywords

compositenanoscalestrength
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 12 , 28 June 2016 , pp. 1741 - 1747
Copyright
Copyright © Materials Research Society 2016 

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