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Thermal analysis investigation of hydriding properties of nanocrystalline Mg-Ni- and Mg-Fe-based alloys prepared by high-energy ball milling

Berlouis, L.E.A. and Cabrera, E. and Hall-Barientos, E. and Hall, P.J. and Dodd, S.B. and Morris, S. and Imam, M.A. (2001) Thermal analysis investigation of hydriding properties of nanocrystalline Mg-Ni- and Mg-Fe-based alloys prepared by high-energy ball milling. Journal of Materials Research, 16 (1). pp. 45-57. ISSN 0884-2914

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Abstract

The hydrogen loading characteristics of nanocrystalline Mg, Mg–Ni (Ni from 0.1 to 10 at.%), and Mg–Fe (Fe from 1 to 10 at.%) alloys in 3 MPa H2 were examined using high pressure differential scanning calorimetry and thermogravimetric analysis. All samples showed rapid uptake of hydrogen. A decrease in the onset temperature for hydrogen absorption was observed with increasing Ni and Fe alloy content, but the thermal signatures obtained suggested that only Mg was involved in the hydriding reaction; i.e., no clear evidence was found for the intermetallic hydrides Mg2NiH4 and Mg2FeH6. Hydrogen loading capacity decreased with temperature cycling, and this was attributed to a sintering process in the alloy, leading to a reduction in the specific surface available for hydrogen absorption.

Item type: Article
ID code: 37357
Keywords: thermal analysis, ball milling, thermogravimetric analysis, hydrogen, Chemistry, Mechanics of Materials, Materials Science(all), Mechanical Engineering, Condensed Matter Physics
Subjects: Science > Chemistry
Department: Faculty of Science > Pure and Applied Chemistry
Faculty of Engineering > Chemical and Process Engineering
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 03 Feb 2012 15:56
    Last modified: 04 Sep 2014 18:51
    URI: http://strathprints.strath.ac.uk/id/eprint/37357

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