Estimation of strength and wear properties of Mg/SiC nanocomposite fabricated through FSP route

M. Deepan, Chandan Pandey, N. Saini, M. M. Mahapatra, R. S. Mulik
2017 Journal of the Brazilian Society of Mechanical Sciences and Engineering  
of aluminum alloy. Even though magnesium alloys possess low density, they also exhibit comparable strengthto-weight ratio with aluminum alloys. Magnesium and its alloys also have excellent vibration dampening capability suitable for critical engineering applications [1]. Being lighter, magnesium alloys are preferred in aerospace applications. The RZ5 alloy is one such alloy consisting of elements such as zinc, zirconium, rare-earth elements, etc., which makes it quite suitable for engineering
more » ... e for engineering applications. Precipitation hardening of RZ5 enhances its mechanical strength making it suitable in applications which require light alloys compared to aluminum. However, the magnesium alloys such as RZ5 do not possess good wear resistance properties which limit their use in certain applications involving friction and wear. To improve the mechanical properties of magnesium alloy, certain wear-resistant elements can be reinforced in it intentionally through suitable process [2] . Particle reinforcement into magnesium alloy melt is one such technique which helps it retain its mechanical property while providing enhanced wear resistance. In the world of metal matrix composite (MMC) manufacturing, several techniques are available to continuously or discontinuously reinforce the particles into the metal matrix [3] . It is observed that use of nanosize particles in several metal matrix leads to better performance compared to macro-size reinforcement [3] . Proper dispersion of particles in a metal matrix is extremely important to achieve the intended enhanced properties such as improved wear characteristics [3] . A conventional way of introducing reinforcements in the metal matrix is through stir casting process. Liquid processing techniques such as stir casting involve melting of the matrix and then introducing reinforcement in it followed with vigorous stirring. While liquid processing techniques like stir casting Abstract The present paper discusses the effects of friction stir processing (FSP) on properties of Mg-SiC nanocomposite. The magnesium-based RZ5 alloy, widely used for aerospace applications, was used in the present investigation as the matrix for the purpose of nanocomposite fabrication. SiC powders of nanosize were reinforced into the RZ5 matrix by FSP with varying process parameters. The process was studied with respect to the effects of parameters such as rotational speed, traverse rate, and number of passes on the nanocomposite. With appropriate parameters, uniform distribution of nanoSiC reinforcements was accomplished in the metal matrix. The abrasive wear property of the Mg-SiC nanocomposite was verified with respect to the FSP process parameters. A mathematical model was also developed to predict the strength and abrasive wear characteristics of the nanocomposite with respect to the FSP parameters.
doi:10.1007/s40430-017-0757-1 fatcat:da2gic2qxnc27ptvjpld2foidi