Crystallization of Amorphous GdFe_2H_x Alloys Prepared by Hydrogen Absorption

概要

論文の詳細を見る
Amorphous a-GdFe_2H_x alloys were prepared by two kinds of technique, i.e., the newly developed hydrogen-induced amorphization (HIA) of the Laves phase c-GdFe_2 and hyrogenation of the rapidly quenched amorphous a-Gd_<33>Fe_<67> alloy. The formation of a GdFe_2H_x by hydrogen absorption was found to occur between 473 K and 573 K where the decomposition of c-GdFe_2 into the elemental hydride GdH_2 and α-Fe is suppressed. On the other hand, the rapidly quenched a-Gd_<33>Fe_<66> alloy could absorb hydrogen in the amorphous state below 523 K. The crystallization behavior of the hydrogen-induced amorphous a-GdFe_2H_<3.6> alloy was similar to that of the hydrogenated amorphous a-Gd_<33>Fe_<67>H_<120> alloy. That is, the DSC curves of the a-GdFe_2H_x alloys showed a broad endothermic peak resulting partial desorption of hydrogen together with two exothermic peaks. The first exothermic peak was associated with the crystallization of the amorphous phase into GdH_2 and α-Fe, and the second one was attributed to the growth of them. On the other hand, a-Gd_<33>Fe_<67> crystallized polymorphously to the Laves phase c-GdFe_2 showing an exothermic peak.
東北大学の論文
1989-03-20