Effect of hydrogen pressure on hydriding kinetics in the Mg2-xAgxNi-H (x=0.05, 0.1) system

The aim of this paper is to study the effect of the initial hydrogen pressure on hydriding kinetics in the two-phase region (a-(3) of the ternary alloy Mg2-xAgxNi (x = 0.05, 0.1). The experiments were carefully performed by a volumetric technique under initial hydrogen pressures ranging from 0.298 t...

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Bibliographic Details
Published in:Journal of alloys and compounds 2005-08, Vol.399 (1-2), p.101-105
Main Authors: QIAN LI, JIANG, Li-Jun, CHOU, Kuo-Chih, QIN LIN, FENG ZHAN, XU, Kuang-Di, LU, Xiong-Gang, ZHANG, Jie-Yu
Format: Article
Language:English
Subjects:
Applied sciences
Chemical and electrochemical properties
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Materials and auxiliary equipments used in energy engineering
Metals. Metallurgy
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Summary:The aim of this paper is to study the effect of the initial hydrogen pressure on hydriding kinetics in the two-phase region (a-(3) of the ternary alloy Mg2-xAgxNi (x = 0.05, 0.1). The experiments were carefully performed by a volumetric technique under initial hydrogen pressures ranging from 0.298 to 1.203 MPa at 553 K. The experimental investigation suggests that an increase of the initial hydrogen pressure results in an acceleration of hydriding reacted fraction. A new kinetic model developed in our laboratory recently was successfully applied to this system and the rate-controlling step in the hydriding process was hydrogen diffusion in the (3 phase. Our study further revealed that a higher content of silver in the Mg2-xAgxNi alloys leads to a faster rate of hydriding; the hydriding kinetics of Mg2Ni could be improved by a partial substitution of Ag for Mg.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2005.03.010