Amorphization of R-Al intermetallic compounds by hydrogenation

X. G. Li, A. Chiba, K. Aoki, T. Masumoto

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11 Citations (Scopus)


Structural changes of R-Al compounds (R=La, Ce, Pr, Nd, Sm, Gd, Dy, Tb, Ho, Er) induced by hydrogenation were investigated by X-ray diffractometry (XRD), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). Hydrogen-induced amorphization (HIA) has been observed in R3Al, R2Al and a part of RAl, but not been observed in C15 Laves RAl2 compounds. The HIA behavior of the R-Al compounds and the crystallization behavior of the resulting amorphous alloys depend not only on the rare earth metals and their compositions, but also on the hydrogen pressure and the hydrogenation temperature. These behaviors of the R-Al compounds are compared with those of the C15 Laves compounds RM2 (M=Fe, Co, Ni) and liquid quenched amorphous alloys of R-Al. In addition, structures of amorphous alloys prepared by HIA and liquid quenching were measured by XRD. The mechanism of HIA was discussed on the basis of the structural data and thermodynamic considerations.

Original languageEnglish
Pages (from-to)253-261
Number of pages9
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 1997 Jun 22
Externally publishedYes


  • Amorphous
  • Crystallization
  • Hydrogen
  • Intermetallic
  • Phase transformation
  • Structure

ASJC Scopus subject areas

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


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