Abstract
Structural changes of RAl compounds (RLa, 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 R 3Al, R 2Al and a part of RAl, but not been observed in C 15 Laves RAl 2 compounds. The HIA behavior of the RAl 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 RAl compounds are compared with those of the C 15 Laves compounds RM 2 (MFe, Co, Ni) and liquid quenched amorphous alloys of RAl. 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.
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