Journal of Science and Technology of Composites

Journal of Science and Technology of Composites

Investigation of the microstructure and hardness of cast Al7068 nanocomposite reinforced with SiC nanoparticles

Document Type : Research Paper

Authors
Mohammad Alipour 1
Reza Eslami-Farsani 2
1 Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran
2 1-Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran
Abstract
In this study, microstructure and mechanical properties of AA7068 nanocomposite reinforced with 1, 2, 3 and 5 wt.% SiC nanoparticles (SiCnp) produced by stir casting and ultrasonic treatment have been investigated. Ultrasound device equipped with a cooling system with 2000 W powers was used for mixing alloy and nanoparticles. Also scanning electron microscopy was used for microstructure studies. The microstructure of nanocomposite was investigated by scanning electron microscope.The microstructural studies of the nanocomposite revealed that SiCnp addition reduces the grain size, but adding higher SiCnp content (5 wt.%) does not change the grain size considerably. Further investigations on hardness revealed that the addition of SiCnp increases hardness. At higher SiCnp contents (5 wt.%), the presence of SiCnp agglomerate on grain boundaries was found that causes decrease the hardness. The optimum amount of nanoparticles is 3 wt.% SiCnp that nanocomposite exhibits hardness of 155 BHN. According to the results of hardness for the initial samples and nanocomposites reinforced with 3 wt.% SiC, 24% increase in hardness can be seen.
Keywords
Casting nanocomposite
SiC nanoparticles
Stir casting
Ultrasonic treatment

Subjects

 
[1] Abbasi, HY. Habib, A. Tanveer, M., "Synthesis and Characterization of Nanostructures of ZnO and ZnO/Graphene Composites for the Application in Hybrid Solar" Journal of Alloys and Compounds, Vol. 690, pp. 21–26, 2017.
[2] Li, X. Yang, Y. Chen, X., "Ultrasonic-Assisted Fabrication of Metal Matrix Nanocomposites" Journal of Materials Science, Vol. 39, pp. 3211-3212, 2004.
[3] Yibin, X. Yoshita, T., "Thermal Conductivity of SiC Fine Particles Reinforced Al Alloy Matrix Composite with Dispersed Particle Size" Journal of Applied Physics, Vol. 95, pp. 722-726, 2004.
[4] Borgonovo, C. Apelian D., "Manufacture of Aluminum Nanocomposites: A Critical Review" Materials Science Forum, Vol. 678, pp. 1-22, 2011.
[5] Karbalaei Akbari, M. Shirvanimoghaddam, K. Hai, Z. Zhuiykov, S. Khayyam, H., "Al-TiB2 Micro/Nanocomposites: Particle Capture Investigations, Strengthening Mechanisms and Mathematical Modelling of Mechanical Properties" Materials Science and Engineering: A, Vol. 682, pp. 98–106, 2017.
[6] Miracle, D., "Metal Matrix Composites–from Science to Technological Significance" Composites Science and Technology, Vol. 65, pp. 2526-2540, 2005.
[7] Wenzhen, L. Shiying, L. Qiongyuan, Z. Xue, Z., "Ultrasonic-Assisted Fabrication of SiC Nanoparticles Reinforced Aluminum Matrix Composites" Materials Science Forum, Vol. 654-656, pp. 990-993, 2010.
[8] Hihn, JY. Doche, ML. Mandroyan, A. Hallez, L. and Pollet, BG., "Respective Contribution of Cavitation and Convective Flow to Local Stirring in Sonoreactors" Ultrasonics Sonochemistry, Vol. 18, pp. 881-887, 2011.
[9] Amirkhanlou, S. Ji, S. Zhang, Y. Watson, D. Fan, Z., "High Modulus Alsingle BondSisingle BondMgsingle BondCu/Mg2Sisingle BondTiB2 Hybrid Nanocomposite: Microstructural Characteristics and Micromechanics-Based Analysis" Journal of Alloys and Compounds, Vol. 694, pp. 313–324, 2017.
[10] Yan, J. Xu, Z. Shi, L. Ma, X. Yang, S., "Ultrasonic Assisted Fabrication of Particle Reinforced Bonds Joining Aluminum Metal Matrix Composites" Mater & Design, Vol. 32, pp. 343-347, 2011.
[11] Shabana, S. Sonawane, SH. Ranganathan, V. Pujjalwar, PH. Pinjari, DV. Bhanvase, BA. Gogate, PR. Ashokkumare, M., "Improved Synthesis of Aluminium Nanoparticles Using Ultrasound Assisted Approach and Subsequent Dispersion Studies in di-octyl Adipate" Ultrasonics Sonochemistry, Vol. 36, pp. 59–69, 2017.
 
Journal of Science and Technology of Composites
Volume 5, Issue 4
Winter 2019
Pages 461-468