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Advances in Materials Science and Engineering has retracted this article. The corresponding author apologizes and the authors agree with retraction. The article was found to contain a substantial amount of material, without citation, from the following published articles:

Figures and Text

(i) Wording in the section “3.1. Microstructure Analysis” and Figure 5 were from Hiroyuki Fukuda, Katsuyoshi Kondoh, Junko Umeda, Bunshi Fugetsu: Interfacial analysis between Mg matrix and carbon nanotubes in Mg–6 wt.% Al alloy matrix composites reinforced with carbon nanotubes. Composites Science and Technology 2011, Vol. 71(5): 705–709. DOI: 10.1016/j.compscitech.2011.01.015

(ii) Wording in the section “3.1. Microstructure Analysis” and Figure 4 were from M.S. Senthil Saravanan, S.P. Kumaresh Babu, K. Sivaprasad: Mechanically Alloyed Carbon Nanotubes (CNT) Reinforced Nanocrystalline AA 4032: Synthesis and Characterization. Journal of Minerals & Materials Characterization & Engineering, Vol. 9, No. 11, pp. 1027–1035, 2010


(iii) C S Goh, J Wei, L C Lee and M Gupta: Development of novel carbon nanotube reinforced magnesium nanocomposites using the powder metallurgy technique. Nanotechnology, Volume 17, Number 1. Published 25 November 2005 (cited in the background, but not in the section “3.2. Mechanical Properties”)

(iv) Ahmed Sayed Salim Mohamed: Fabrication and Properties of Carbon Nanotube (CNT) – Reinforced Aluminium Composites. The American University in Cairo School of Sciences & Engineering, Spring 2010


(v) Figure 8(a) was simultaneously published as Figure 1 in J. Jayakumar, B. K. Raghunath, T. H. Rao: Investigation on Fracture Mechanisms in Mg alloy AZ31 Nano Composites Reinforced with Multi Wall Carbon Nano Tubes. International Journal of Innovative Research in Science, Engineering and Technology, Vol. 2, Issue 9, September 2013

View the full Retraction here.


  1. J. Jayakumar, B. K. Raghunath, and T. H. Rao, “Enhancing microstructure and mechanical properties of AZ31-MWCNT nanocomposites through mechanical alloying,” Advances in Materials Science and Engineering, vol. 2013, Article ID 539027, 6 pages, 2013.
Advances in Materials Science and Engineering
Volume 2013, Article ID 539027, 6 pages
Research Article

Enhancing Microstructure and Mechanical Properties of AZ31-MWCNT Nanocomposites through Mechanical Alloying

1Department of Manufacturing Engineering, Annamalai University, Chidambaram, Tami Nadu, India
2Department of Mechanical Engineering, PDVVP College of Engineering, Ahmednagar, Maharashtra, India

Received 27 May 2013; Revised 14 September 2013; Accepted 15 September 2013

Academic Editor: Bin Zhang

Copyright © 2013 J. Jayakumar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Multiwall carbon nanotubes (MWCNTs) reinforced Mg alloy AZ31 nanocomposites were fabricated by mechanical alloying and powder metallurgy technique. The reinforcement material MWCNTs were blended in three weight fractions (0.33%, 0.66%, and 1%) with the matrix material AZ31 (Al-3%, zinc-1% rest Mg) and blended through mechanical alloying using a high energy planetary ball mill. Specimens of monolithic AZ31 and AZ31-MWCNT composites were fabricated through powder metallurgy technique. The microstructure, density, hardness, porosity, ductility, and tensile properties of monolithic AZ31 and AZ31-MWCNT nano composites were characterized and compared. The characterization reveals significant reduction in CNT (carbon nanoTube) agglomeration and enhancement in microstructure and mechanical properties due to mechanical alloying through ball milling.