Synthesis and characterization of nanocrystallineMg-7.4%Al powders produced by mechanical alloying

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Date
2013
Volume
3
Issue
1
Journal Title
Title
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Publisher
Basel : MDPI AG
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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.

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Keywords
Hardness, Mechanical alloying, Morphology, Nanocrystalline, Particle size
Citation
Chaubey, A. K., Scudino, S., Khoshkhoo, M. S., Prashanth, K. G., Mukhopadhyay, N. K., Mishra, B. K., & Eckert, J. (2013). Synthesis and characterization of nanocrystallineMg-7.4%Al powders produced by mechanical alloying. 3(1). https://doi.org//10.3390/met3010058
License
CC BY-NC-SA 3.0 Unported