Long-term hydrogen storage in Mg and ZK60 after Severe Plastic Deformation

Grill, Andreas; Horky, Jelena; Panigrahi, Ajit; Krexner, G.; Zehetbauer, M.

doi:10.1016/j.ijhydene.2015.05.145

Cited by 63 publications

(36 citation statements)

References 23 publications

(34 reference statements)

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“…However, not all SPD-processed materials show high stability. There are several reports [109][110][111] that ARB-or HPT-processed MgH 2 powder has good kinetics but low stability and this was confirmed by a recent high-cycle study [108] as shown in Figure 14. After 40 cycles, the capacity of hydrogen loading clearly decreased.…”

Section: Mg and Mgmentioning

confidence: 53%

See 1 more Smart Citation

Fundamentals of Superior Properties in Bulk NanoSPD Materials

Valiev

Estrin

Horita

et al. 2015

Materials Research Letters

296

136

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Bulk nanoSPD materials are materials with nanostructural features, such as nanograins, nanoclusters, or nanotwins, produced by severe plastic deformation (SPD) techniques. Such nanostructured materials are fully dense and contamination free and in many cases they have superior mechanical and functional properties. Here, we provide a critical overview of such materials, with a focus on the fundamentals for the observed extraordinary properties. We discuss the unique nanostructures that lead to the superior properties, the underlying deformation mechanisms, the critical issues that remain to be investigated, future research directions, and the application potential of such materials.

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Section: Mg and Mgmentioning

confidence: 53%

“…In that material, it is the comparably large volume of the hydride particles which decreases the hydrogen loading capacity as the hydrogen diffusion becomes sluggish compared with the non-hydrogenated substance. [108] 4.3.2. TiFe Alloys.…”

Section: Mg and Mgmentioning

confidence: 99%

Fundamentals of Superior Properties in Bulk NanoSPD Materials

Valiev

Estrin

Horita

et al. 2015

Materials Research Letters

296

136

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“…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%

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

Valiev

Estrin

Horita

et al. 2016

JOM

395

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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“…Many papers have reported the formation of ultrafine grained structures in pure magnesium [3][4][5][6] and AZ31 [7][8][9][10][11] , AZ61 12 , AZ80 13 , AZ91 [14][15][16] , ZK60 [17][18][19] , Mg-Zn-Y 20,21 , Mg-Gd-Y-Zr 22,23 , Mg-Zn-Ca [24][25][26][27] and Mg-Dy-Al-Zn-Zr 28 alloys. The processed alloys exhibit improved strength but also some papers report superplastic behaviour 16,19,22,29,30 , improved hydrogen storage properties 3,[31][32][33][34][35] and improved corrosion resistance 24,27,36 . Formation of ultrafine grained structures and improved strength are also observed in other metallic materials processed by HPT.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Hardness Evolution in Magnesium Processed by HPT

et al. 2017

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High pressure torsion provides an opportunity to process materials with low formability such as magnesium at room temperature. The present work shows the microstructure evolution in commercially pure magnesium processed using a pressure of 6.0 GPa up to 10 turns of rotation. The microstructure evolution is evaluated using electron microscopy and the hardness is determined using dynamic hardness testing. The results show that the grain refinement mechanism in this material differs from materials with b.c.c. and f.c.c. structures. The mechanism of grain refinement observed at high temperatures also applies at room temperature. The hardness distribution is heterogeneous along the longitudinal section of the discs and is not affected by the amount of deformation imposed to the material.

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Long-term hydrogen storage in Mg and ZK60 after Severe Plastic Deformation

Cited by 63 publications

References 23 publications

Fundamentals of Superior Properties in Bulk NanoSPD Materials

Fundamentals of Superior Properties in Bulk NanoSPD Materials

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

Microstructure and Hardness Evolution in Magnesium Processed by HPT

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