Hydrogen storage properties of bulk nanostructured ZK60 Mg alloy processed by Equal Channel Angular Pressing

Krystian, Maciej; Zehetbauer, M.; Kropik, H.; Mingler, Bernhard; Krexner, G.

doi:10.1016/j.jallcom.2011.01.029

Cited by 89 publications

(62 citation statements)

References 25 publications

(41 reference statements)

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“…90 Not only the fast absorption/desorption kinetics but also the lower operating temperature are important requirements. It has been shown that ECAP processing at least achieves the kinetics of ball-milled, nanostructured, Mg-based alloys with a promise of a simpler, purity-conserving, and lowcost production, free of potential hazards of handling of fine Mg powders (see recent reports 91,92 and reviews 93,94 ). Furthermore, the stability of the storage capacity and the absorption/desorption kinetics were maintained over a large number of cycles (Fig.…”

Section: Spd-processed Hydrogen Storage Materialsmentioning

confidence: 99%

“…7) even without use of catalysts when the alloys had been processed by ECAP and HPT. 92,95 It turned out that SPD-induced lattice defects other than grain boundaries act as nucleation sites for hydrogenation and that their stability is critical for the overall reproducibility of the absorption/desorption kinetics. Another work studying the hydrogen kinetics in an HPT-processed Mg 2 Ni alloy 96 gave evidence that a high density of HPT-induced planar lattice defects, such as crystallite boundaries and stacking faults, is responsible for the enhancement of hydrogen sorption kinetics.…”

Section: Spd-processed Hydrogen Storage Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Valiev

Estrin

Horita

et al. 2016

JOM

394

186

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It is now well established that the processing of bulk solids through the application of severe plastic deformation (SPD) leads to exceptional grain refinement to the submicrometer or nanometer level. Extensive research over the last decade has demonstrated that SPD processing also produces unusual phase transformations and leads to the introduction of a range of nanostructural features, including nonequilibrium grain boundaries, deformation twins, dislocation substructures, vacancy agglomerates, and solute segregation and clustering. These many structural changes provide new opportunities for fine tuning the characteristics of SPD metals to attain major improvements in their physical, mechanical, chemical, and functional properties. This review provides a summary of some of these recent developments. Special emphasis is placed on the use of SPD processing in achieving increased electrical conductivity, superconductivity, and thermoelectricity, an improved hydrogen storage capability, materials for use in biomedical applications, and the fabrication of high-strength metal-matrix nanocomposites.

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Section: Spd-processed Hydrogen Storage Materialsmentioning

confidence: 99%

Section: Spd-processed Hydrogen Storage Materialsmentioning

confidence: 99%

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Valiev

Estrin

Horita

et al. 2016

JOM

394

186

View full text Add to dashboard Cite

show abstract

“…SPD processing may produce multiple defects in the crystalline lattice, such as vacancies and dislocations, which have a positive effect on the kinetics of hydrogen diffusion [17][18][19][20][21] . [22][23][24][25] , accumulative roll bonding (ARB) 26 and high-pressure torsion (HPT) 27,28 are the most intensively studied to process Mg-based materials for hydrogen storage applications.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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Magnesium (Mg) is a light metal with relatively low cost. Its hydride (MgH 2 ) is interesting for the safe hydrogen storage in solid state and has a high gravimetric capacity of 7.6%. Practical application of Mg is still hampered by high reaction temperatures and slow kinetics. In order to improve it and focus on more viable industrial processing conditions, Mg plates, with or without iron (Fe) addition, in the form of wires and powders, were submitted to severe plastic deformation (SPD) in air, starting with extensive cold rolling (ECR), followed by repetitive rolling (ARB). The samples were characterized by X-ray diffraction (XRD), optical microscopy (OM), scanning (SEM) and transmission electron microscopy (TEM). H 2 storage properties were evaluated by differential scanning calorimetry (DSC) and Sievert's volumetric method. Mg processed by ECR+ARB resulted in larger grain refinement and densities of cracks than ECR. In addition, Fe in the form of continuous wires was fragmented and resulted in a better distribution of particles than powders, which agglomerated. Thus, finally, the synergetic effect of microstructural features and Fe as catalyst and its distribution improved activation, kinetics and hydrogen storage capacity.

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“…Except for 75% of the theoretical maximum storage capacity that had been reached within 1 h, the corresponding discharging time was reduced from 15 min to approximately 5 min. As shown in Figure 5, the result also presented an increase in the kinetics for the first 50 cycles, after which it increased slightly for the next 150 cycles, and remained at that level up to at least 1000 cycles [24]. with CR, the hydrogen capacity could be highly promoted, which reached about 4 wt % of H2 [21].…”

Section: Cycling Stabilitymentioning

confidence: 80%

A Critical Review of Mg-Based Hydrogen Storage Materials Processed by Equal Channel Angular Pressing

Lisha

Jiang

et al. 2017

Metals

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Abstract:As a kind of cost-efficient hydrogen storage materials with high hydrogen capacity and light weight, Mg-based alloys have attracted much attention. This review introduces an effective technique in producing bulk ultrafine-grained (UFG) Mg alloys and promoting its hydrogen storage property, namely, equal-channel angular pressing (ECAP). This paper briefly describes the technical principle of ECAP and reviews the research progress on hydrogen storage properties of ECAP-processed Mg alloys. Special attention is given to their hydrogen storage behaviors including hydrogen storage dynamics, capacity, and cycling stability. Finally, it analyzes the factors that affect the hydrogen storage properties of ECAP-processed Mg alloys, such as the grain sizes, lattice defects, catalysts, and textures introduced by ECAP process.

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Hydrogen storage properties of bulk nanostructured ZK60 Mg alloy processed by Equal Channel Angular Pressing

Cited by 89 publications

References 25 publications

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

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

A Critical Review of Mg-Based Hydrogen Storage Materials Processed by Equal Channel Angular Pressing

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