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Metals 2011, 1(1), 3-15; doi:10.3390/met1010003

Evolution of Morphology and Microstructure in Electrodeposited Nanocrystalline Al–Mg Alloy Dendrites

*  and
Materials Science and Engineering Department, University of Florida, Gainesville, FL 32611, USA
* Author to whom correspondence should be addressed.
Received: 8 August 2011 / Revised: 23 August 2011 / Accepted: 29 August 2011 / Published: 5 September 2011
(This article belongs to the Special Issue Nanocrystalline Metals and Alloys)
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Nanocrystalline Al–Mg dendrites were fabricated through galvanostatic electrodeposition. Initially feather-like morphology was formed exhibiting morphological evolution to smooth globules at its tips. With eventual deposition, rough globules formed over the smooth ones. The feather-like and smooth globules possessed supersaturated face centered cubic (fcc)–Al(Mg) phase with ~7 and ~20 at.% Mg respectively. The rough globules contained hexagonal close packed (hcp)–Mg(Al) phase with ~80 at.% Mg. Microstructural examinations revealed that the feather-like and rough globules possessed grain sizes of ~42 ± 15 and ~36 ± 12 nm respectively. The region, which exhibited morphological evolution from feather-like to smooth globules, possessed ~16 ± 7 nm grain size. The observed microstructural and compositional features were attributed to the local current density values. The formation of the Al–Mg dendrites is discussed in this paper.
Keywords: Al–Mg; nanocrystalline; dendrites; morphology; microstructure Al–Mg; nanocrystalline; dendrites; morphology; microstructure
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Tatiparti, S.S.V.; Ebrahimi, F. Evolution of Morphology and Microstructure in Electrodeposited Nanocrystalline Al–Mg Alloy Dendrites. Metals 2011, 1, 3-15.

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