Metals 2013, 3(1), 58-68; doi:10.3390/met3010058
Article

Synthesis and Characterization of NanocrystallineMg-7.4%Al Powders Produced by Mechanical Alloying

Received: 28 November 2012; in revised form: 19 December 2012 / Accepted: 25 December 2012 / Published: 4 January 2013
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.
Abstract: Nanocrystalline Mg-7.4%Al powder was prepared by mechanical alloying using a high-energy mill. The evolution of the various phases and their microstructure, including size and morphology of the powder particles in the course of milling and during subsequent annealing, were investigated in detail. Room temperature milling leads to a rather heterogeneous microstructure consisting of two distinct regions: Al-free Mg cores and Mg-Al intermixed areas. As a result, the material is mechanically heterogeneous with the Mg cores displaying low hardness (40–50 HV) and the Mg-Al intermixed regions showing high hardness of about 170 HV. The Mg cores disappear and the microstructure becomes (also mechanically) homogeneous after subsequent cryo-milling. Rietveld structure refinement reveals that the crystallite size of the milled powders decreases with increasing the milling time reaching a minimum value of about 30 nm. This is corroborated by transmission electron microscopy confirming an average grain size of ~25 nm.
Keywords: mechanical alloying; nanocrystalline; hardness; particle size; morphology
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MDPI and ACS Style

Chaubey, A.K.; Scudino, S.; Khoshkhoo, M.S.; Prashanth, K.G.; Mukhopadhyay, N.K.; Mishra, B.K.; Eckert, J. Synthesis and Characterization of NanocrystallineMg-7.4%Al Powders Produced by Mechanical Alloying. Metals 2013, 3, 58-68.

AMA Style

Chaubey AK, Scudino S, Khoshkhoo MS, Prashanth KG, Mukhopadhyay NK, Mishra BK, Eckert J. Synthesis and Characterization of NanocrystallineMg-7.4%Al Powders Produced by Mechanical Alloying. Metals. 2013; 3(1):58-68.

Chicago/Turabian Style

Chaubey, Anil K.; Scudino, Sergio; Khoshkhoo, Mohsen S.; Prashanth, Konda G.; Mukhopadhyay, Nilay K.; Mishra, Barada K.; Eckert, Jürgen. 2013. "Synthesis and Characterization of NanocrystallineMg-7.4%Al Powders Produced by Mechanical Alloying." Metals 3, no. 1: 58-68.

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