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

Alberto Moreira Jorge, Gisele Ferreira De Lima, Maria Regina Martins Triques, Walter José Botta, Claudio Shyinti Kiminami, Ricardo Pereira Nogueira, Alain Reza Yavari, Terence G. Langdon

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

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.

Original languageBritish English
Pages (from-to)3810-3821
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number8
DOIs
StatePublished - 6 Mar 2014

Keywords

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

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