A new approach to the processing of metal hydrides

Application of Severe Plastic Deformation Techniques to Magnesium for Enhanced Hydrogen Sorption Properties

“…The capital and operating cost of these techniques is potentially much less than mechanical milling. For example, a recent investigation has shown that at laboratory scale cold rolling could produce similar enhancement of hydrogen storage properties of magnesium hydride than ball milling but with energy requirement and processing time reduced by an order of magnitude [20]. The same reduction is expected at industrial level.…”

“…In the case of Ti-based alloys, Zhang et al [5,6] studied the effect of cold rolling on the hydrogen sorption properties of Ti-22Al-27Nb alloy and found better hydrogenation kinetics for cold rolled samples but only for the first hydrogenation cycle. Magnesium alloys have been studied by a few groups using different SPD techniques or combination of them [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. These studies will be discussed in more details in the next sections but the general conclusion is that SPD techniques could improve the hydrogen sorption properties of magnesium alloys.…”

Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties

“…It can introduce an ultra-high plastic deformation without considerable geometric changes in the material's cross-section, which may be occurring with small number of passes 26 . Some studies have shown that MgH 2 powder processed by ARB leads to nanoscale grain refinement and improved H 2 absorption/ desorption kinetics 29,30 . In addition, ARB is effective to synthesize nanocomposites by the addition of catalysts such as transition metals 31 and oxides 32 in the MgH 2 matrix of milled powder.…”

The influence of ball-milling time on the dehydrogenation properties of the NaAlH4–MgH2 composite

“…This effect may be associated with the impact of high energy ball-milling on the grinded samples. Prolonged milling of hydrides such as MgH 2 leads to decreased crystallite and particle sizes, and of the introduction of various defects, which enable a faster hydrogen diffusion process in the bulk of the ball-milled materials [20,21]. A significant temperature decrease of 60e80 C, depending on the sample, is also more clearly observed during the completed first dehydrogenation step in Fig.…”