The hydrogen absorption-desorption performances of Mg-Co-X ternary alloys with BCC structure

Yao Zhang, Yoshinori Tsushio, Hirotoshi Enoki, Etsuo Akiba

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

To improve hydrogenation properties of Mg-Co binary alloys that were developed by the present authors, ternary Mg50Co45X 5 alloys (X = Fe, Cu and Pd) were synthesized by ball milling. The formation of the BCC phase in the ternary alloys was verified by means of a XRD Rietveld analysis and TEM observation. The BCC lattice parameters of Mg 50Co45X5 (X = Fe, Cu and Pd) were found to be smaller than that of Mg50Co50. Fe addition to Mg 50Co50 alloy improved the hydrogen absorption capacity to 2.59 mass% at 373 K. The Pd and Cu added alloys showed a desorption isotherm for which the desorption capacity was up to 0.2 mass% at 373 K in the pressure range of 0.01-5.0 MPa. In situ DSC measurements revealed that the hydrogen absorption and desorption reactions of all the ternary alloys studied were reversible at the first thermal cycle. A series of ternary Mg 50Co50-yCuy (y = 5, 7, 9, 10) BCC alloys were synthesized by ball milling. It was found that Mg50Co 41Cu9 had the highest hydrogen absorption content (2.0 mass%) among these alloys at 373 K, while it desorbed 0.3 mass% hydrogen at the same temperature under vacuum.

Original languageEnglish
Pages (from-to)185-193
Number of pages9
JournalJournal of Alloys and Compounds
Volume393
Issue number1-2
DOIs
Publication statusPublished - May 3 2005

All Science Journal Classification (ASJC) codes

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

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