Author/Authors :
He, Hui Science and Technology on Surface Physics and Chemistry Laboratory - Mianyang , China , Kou, Huaqin Institute of Materials - China Academy of Engineering Physics - Mianyang , China , Tang, Tao Institute of Materials - China Academy of Engineering Physics - Mianyang , China , Huang, Zhiyong Institute of Materials - China Academy of Engineering Physics - Mianyang , China , Sang , Ge Institute of Materials - China Academy of Engineering Physics - Mianyang , China , Zhang, Guanghui Institute of Materials - China Academy of Engineering Physics - Mianyang , China , Ba, Jingwen Institute of Materials - China Academy of Engineering Physics - Mianyang , China , Liu, Meng Institute of Materials - China Academy of Engineering Physics - Mianyang , China , Luo, Wenhua Science and Technology on Surface Physics and Chemistry Laboratory - Mianyang , China
Abstract :
The effects of ball milling on the hydrogen sorption kinetics and microstructure of Zr0.8Ti0.2Co have been systematically studied.Kinetic measurements show that the hydrogenation rate and amount of Zr0.8Ti0.2Co decrease with increasing the ball milling time.However, the dehydrogenation rate accelerates as the ball milling time increases. Meanwhile, the disproportionation of Zr0.8Ti0.2Cospeeds up after ball milling and the disproportionation kinetics is clearly inclined to be linear with time at 500∘C. It is found from X-ray powder diffraction (XRD) results that the lattice parameter of Zr0.8Ti0.2Co gradually decreases from 3.164 ̊A to 3.153 ̊A when theball milling time extends from 0 h to 8 h, which is mainly responsible for the hydrogen absorption/desorption behaviors. In addition,scanning electron microscope (SEM) images demonstrate that the morphology of Zr0.8Ti0.2Co has obviously changed after ballmilling, which is closely related to the hydrogen absorption kinetics. Besides, high-resolution transmission electron microscopy(HRTEM) images show that a large number of disordered microstructures including amorphous regions and defects exist afterball milling, which also play an important role in hydrogen sorption performances. This work will provide some insights into theprinciples of how to further improve the hydrogen sorption kinetics and disproportionation property of Zr0.8Ti0.2Co
Keywords :
Structural , Kinetic Hydrogen Sorption Properties , Zr0.8Ti0.2Co Alloy Prepared , Ball Milling , XRD , HRTEM
