Amorphization of R-Al intermetallic compounds by hydrogenation

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

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

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
Volume255
Issue number1-2
DOIs
Publication statusPublished - 1997 Jun 22
Externally publishedYes

Keywords

  • 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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