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Potentiostatic versus galvanostatic electrodeposition of nanocrystalline Al–Mg alloy powders

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Abstract

Nanocrystalline supersaturated dendritic Al–Mg powders were electrodeposited using potentiostatic and galvanostatic techniques under equal-charge conditions. In potentiostatic deposition morphology depended on applied potential: featherlike at lower and globular at higher potentials. Galvanostatic deposits yielded both morphologies at any current density. Morphological evolution was observed in galvanostatic deposits from featherlike to globular. Independent of deposition technique face-centered cubic Al(+Mg) phase with ∼7 atom% Mg (featherlike) with/without ∼20 atom% Mg (smooth globular) composition formed at lower applied/realized potentials (or deposition rates). Higher applied/realized potentials showed hexagonal close packed Mg(+Al) phase with ∼80 atom% Mg (rough globules) over smooth globules. Potentiostatic and galvanostatic deposits were compared for their morphologies, phases, and compositions.

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Acknowledgments

Support from National Science Foundation (grant number DMR-0605406) is greatly appreciated.

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  1. Sankara Sarma V. Tatiparti

    Present address: General Motors Technical Center India Pvt. Ltd, 3rd Floor, Creator Building, ITPL, Bangalore, India, 560 066

Authors and Affiliations

  1. Materials Science and Engineering Department, University of Florida, Gainesville, FL, 32611, USA

    Sankara Sarma V. Tatiparti & Fereshteh Ebrahimi

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  1. Sankara Sarma V. Tatiparti
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  2. Fereshteh Ebrahimi
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Correspondence to Sankara Sarma V. Tatiparti.

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Tatiparti, S.S.V., Ebrahimi, F. Potentiostatic versus galvanostatic electrodeposition of nanocrystalline Al–Mg alloy powders. J Solid State Electrochem 16, 1255–1262 (2012). https://doi.org/10.1007/s10008-011-1522-5

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  • DOI: https://doi.org/10.1007/s10008-011-1522-5

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