Evolution of microstructure in MgH2 powder particles during high energy ball milling and hydrogen cycling

Biswajit Paik, I. P. Jones, A. Walton, V. Mann, D. Book, I. R. Harris

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    We investigated in details the evolution of microstructure by electron microscopy when powder MgH2 particles were ball milled up to 60 h. The average particle size reduced to less than 5 μm within 5 h of milling from an average size of 38 μm measured before milling. The grain size reduced from an average of ∼750 nm in the un-milled powder to below 100 nm after milling. Particle size, as well as the grain size of milled powders followed log-normal distribution. Lattice strain was introduced significantly in the milled powder as a result of milling. Upon hydrogen cycling, this strain was reduced and the grain size was increased.

    Original languageEnglish
    Pages (from-to)515-520
    Number of pages6
    JournalJournal of Alloys and Compounds
    Volume492
    Issue number1-2
    DOIs
    Publication statusPublished - 2010 Mar 4

    Keywords

    • Energy storage materials
    • Hydrogen absorbing materials
    • Mechanical alloying
    • TEM

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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