Title

Synthesis Of Mg-Al2O3 Nanocomposites By Mechanical Alloying

Keywords

Alumina; Magnesium; Mechanical alloying; Phase evolution; Scanning electron microscopy; X-ray diffraction

Abstract

Mg-Al2O3 nanocomposite powders, with Al 2O3 particles of 50 nm size, were synthesized by mechanical alloying starting from a mixture of 70 vol.% pure Mg and 30 vol.% Al2O3 powders. A steady-state condition was obtained on milling the powder mix for about 20 h, when the crystallite size of the Mg powder was about 10 nm. The structural evolution during milling was monitored using scanning electron microscopy, energy dispersive spectrometry, and X-ray diffraction methods. The results showed that a mixture of Mg, Al 2O3, and MgO phases were obtained on mechanical alloying. On annealing the milled powders at 600 °C for 30 min, a displacement reaction occurred between the Mg and Al2O3 phases, when the formation of a mixture of pure Al and MgO phases was observed. Also, a reaction occurred between the initial Mg powder and Al formed as a result of the displacement reaction, leading to the formation of Mg17Al 12, Al0.58Mg0.42, and Al3Mg 2 phases. Thus, the powder annealed after milling the Mg + Al 2O3 powder mix for 25 h consisted of Al, MgO and Al 3Mg2 phases.© 2013 Elsevier B.V. All rights reserved.

Publication Date

6-25-2013

Publication Title

Journal of Alloys and Compounds

Volume

563

Number of Pages

165-170

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.jallcom.2013.01.113

Socpus ID

84874942636 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84874942636

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