Phase relations and hydrogenation behavior of Sr1-xCaxAl2 (0≤x≤1)

Q. A. Zhang, H. Enoki, E. Akiba

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16 Citations (Scopus)

Abstract

The phase relations and hydrogenation behavior of Sr1-xCaxAl2 (x=0, 0.1, 0.2, 0.3, 0.5, 0.75 and 1.0) alloys have been studied. It was found that the Zintl phase with orthorhombic structure existed when x≤0.1, which transformed into an unknown hydride phase under hydrogen pressure of 7 MPa at 543 K for 5 days. Increasing x to 0.2, the Zintl phase and C15-type Laves phase coexisted. Both of them transformed into (Sr,Ca)H2 and Al upon hydrogenation. When x≥0.3, however, there was no Zintl phase but the Laves phase was dominant. After hydrogenation, there a certain amount of (Sr,Ca)H2 and Al as well as a large amount of C15 phase remained in hydrogenated Sr0.7Ca0.3Al2, Sr0.5Ca0.5Al2 and Sr0.25Ca0.75Al2. The crystal structure of the binary CaAl2 alloy did not change with hydrogenation.

Original languageEnglish
Pages (from-to)257-264
Number of pages8
JournalJournal of Alloys and Compounds
Volume322
Issue number1-2
DOIs
Publication statusPublished - Jun 28 2001

All Science Journal Classification (ASJC) codes

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

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