Atomic-Scale Structural Evolution and Crystallization Mechanism of Ti-Zr-Ni-Cr Amorphous Ribbons During Hydrogen Absorption.

The atomic-scale structural evolution and crystallization mechanism of Ti-Zr-Ni-Cr amorphous ribbons subjected to hydrogen absorption have been studied. The atomic degree of order and amount of one-dimensional (1D), two-dimensional (2D) or three-dimensional (3D) ordered atomic packing structure of Ti-Zr-Ni-Cr amorphous ribbons were found to increase in the process of hydrogen absorption, resulting in excellent mechanical and hydrogen absorption properties. When the hydrogen absorption capacity reached 22.4 mL/g, crystallization occurred on the basis of 1D, 2D or 3D ordered atomic packing structure. Hydrogen atom induced Ti-Zr-Ni-Cr amorphous ribbons to crystallize into ZrH, TiH hydride and (ZrTi)Ni phases during the process of hydrogen absorption. When the samples absorbed hydrogen for a long time, formation of crystalline phases of ZrH, TiH hydride and (ZrTi)Ni led to degraded mechanical properties. [ABSTRACT FROM AUTHOR]