Interrelation between Hydrogen Desorption Kinetics and Structure of (Mg2Ni)Hx and Hydrogenated Eutectic(Mg/Mg2Ni)Hy

Jiri Cermak; Lubomir Král

doi:10.4028/www.scientific.net/DDF.289-292.167

Paper Titles

A Methodology to Deduce the Microstructural Spatial Deformation of Polycrystalline Structures: Application to the Alloy 600
p.137

Diffusion of ⁶⁵Zn in AZ91 and QE22 Alloys with Saffil Reinforcement-Influence of Interfaces Matrix/Saffil
p.145

Evolution of Precipitate Depleted Zones in Mg-Based Alloys Strengthened by Precipitation Hardening
p.153

Influence of Interstitials Content on the Diffusion of Niobium in Alloy 718
p.161

Interrelation between Hydrogen Desorption Kinetics and Structure of (Mg₂Ni)H_x and Hydrogenated Eutectic(Mg/Mg₂Ni)H_y
p.167

Microstructure of the Passive Layer Formed on Different Austenitic Stainless Steels Implanted with Molybdenum
p.175

Synthesis and Characterization of a Porous Silicon Filter with Si₃N₄ Whiskers
p.185

Effect of the Si Additions on the Mechanical Behaviour and High-Temperature Performance of Hydrogen Sintered 434L Stainless Steels
p.195

Hydrogen Embrittlement of High Strength Steels
p.203

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 289-292Interrelation between Hydrogen Desorption Kinetics...

Interrelation between Hydrogen Desorption Kinetics and Structure of (Mg₂Ni)H_x and Hydrogenated Eutectic(Mg/Mg₂Ni)H_y

Abstract:

Mg-rich alloys of the binary system Mg-Ni are prospective hydrogen-storage materials. In the present study, desorption characteristics of hydrided Mg2Ni intermetalic and hydrided Mg/Mg2Ni eutectic mixture were investigated. Structure of experimental materials during the hydrogenation was observed by SEM. Three modifications of (Mg2Ni)Hx (x ~ 4) were prepared differing in the ratio of two low-temperature phases f = LT2/LT1: with (i) f >1, (ii) f ~ 1 and with (iii) f <1. Evolution of the ratio f during hydrogen desorption was checked by XRD. It was found that the micro-twinned phase LT2 is not desirable in hydrogen-storage materials containing Mg2Ni intermetallic. Diffusion coefficient of hydrogen in LT2 is about 20 times lower than in LT1.