4.7 Article

Correlation between hydrogen storage properties and textures induced in magnesium through ECAP and cold rolling

Journal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 39, Issue 8, Pages 3810-3821

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2013.12.154

Keywords

Hydrogen storage; Mg hydrides; Hydrogen-absorbing materials; ECAP; Cold rolling

Funding

  1. FAPESP [2011/51245-8]
  2. Coselho Nacional de Desenvolvimento Cientifico e Tecnologico CNPq [237345/2012-9 PDE (CsF)]
  3. European Research Council [267464-SPDMETALS]
  4. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [11/51245-8] Funding Source: FAPESP

Ask authors/readers for more resources

It is feasible to obtain a significant enhancement of the hydrogen storage capability in magnesium by selecting an appropriate sequence of mechanical processing. The Mg metal may be produced with different textures which will then give significant differences in the absorption/desorption kinetics and in the incubation times for hydrogenation. Using processing by equal-channel angular pressing (ECAP), different textures may be produced by changing both the numbers of passes through the ECAP die and the ram speed. Significant grain refinement is easily avoided by using commercial coarse-grained magnesium as the starting material. The use of cold rolling after ECAP further increases the preferential texture for hydrogenation. The results show that the hydriding properties are enhanced with a (002) texture where the improved kinetics lie mainly in the initial stages of hydrogenation. An incubation time is associated with the presence of a (101) texture and this is probably due to the magnesium oxide stability in this direction. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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