Bulk nanocrystalline gamma magnesium hydride with low dehydrogenation temperature stabilized by plastic straining via high-pressure torsion

2018 ◽  
Vol 157 ◽  
pp. 54-57 ◽  
Author(s):  
Kaveh Edalati ◽  
Kouki Kitabayashi ◽  
Yuji Ikeda ◽  
Junko Matsuda ◽  
Hai-Wen Li ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Magnesium Hydride ◽  
Bulk Nanocrystalline

Bulk nanocrystalline ω-Zr by high-pressure torsion

2008 ◽  
Vol 58 (3) ◽  
pp. 219-222 ◽  
Author(s):  
M.T. Pérez-Prado ◽  
A.A. Gimazov ◽  
O.A. Ruano ◽  
M.E. Kassner ◽  
A.P. Zhilyaev
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Bulk Nanocrystalline

Hydrogen Sorption Properties of the Complex Hydride Mg2FeH6 Consolidated by HPT

2010 ◽  
Vol 667-669 ◽  
pp. 1053-1058 ◽  
Author(s):  
Gisele Ferreira De Lima ◽  
Daniel Rodrigo Leiva ◽  
Tomaz Toshimi Ishikawa ◽  
Claudemiro Bolfarini ◽  
Claudio Shyinti Kiminami ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Activation Barrier ◽  
Hydrogen Desorption ◽  
Hydrogen Atmosphere ◽  
Sorption Properties ◽  
Hydrogen Sorption ◽  
Powder Form ◽  
Reactive Milling ◽  
Bulk Nanocrystalline

In the present work, we have processed 2Mg-Fe mixtures by reactive milling (RM) under hydrogen atmosphere to synthesize Mg2FeH6 phase in the powder form which were then systematically processed by High Pressure Torsion (HPT) to produce bulk samples. The bulk samples were characterized in terms of microstructural and structural analyses and of hydrogen desorption properties. The hydrogen sorption properties after HPT processing was evaluated in comparison with the Mg2FeH6 powder obtained by RM and with commercial MgH2. HPT processing of Mg2FeH6 can produce bulks with a high density of defects that drastically lower the activation barrier for hydrogen desorption. Therefore, the bulk nanocrystalline Mg2FeH6 samples show endothermic hydrogen decomposition peak at a temperature around 320°C. In addition, when compared with the Mg2FeH6 and MgH2 powders, the Mg2FeH6 HPT disks showed the same results presented by the Mg2FeH6 powders and certainly decreases the onset transition temperature by as much as 160°C when compared with the MgH2 powders.

scholarly journals Structural modifications during heating of bulk nanocrystalline FeAl produced by high-pressure torsion

2010 ◽  
Vol 58 (17) ◽  
pp. 5631-5638 ◽  
Author(s):  
C. Mangler ◽  
C. Gammer ◽  
H.P. Karnthaler ◽  
C. Rentenberger
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Structural Modifications ◽  
Bulk Nanocrystalline

scholarly journals High-Pressure Torsion of Non-Equilibrium Hydrogen Storage Materials: A Review

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 819
Author(s):  
Ádám Révész ◽  
Marcell Gajdics
Keyword(s):  
High Pressure ◽  
Solid State ◽  
Hydrogen Storage ◽  
Amorphous Materials ◽  
High Pressure Torsion ◽  
Energy System ◽  
Grand Challenge ◽  
Storage Solutions ◽  
Bulk Nanocrystalline ◽  
Non Equilibrium

As the most abundant element in the world, hydrogen is a promising energy carrier and has received continuously growing attention in the last couple of decades. At the very moment, hydrogen fuel is imagined as the part of a sustainable and eco-friendly energy system, the “hydrogen grand challenge”. Among the large number of storage solutions, solid-state hydrogen storage is considered to be the safest and most efficient route for on-board applications via fuel cell devices. Notwithstanding the various advantages, storing hydrogen in a lightweight and compact form still presents a barrier towards the wide-spread commercialization of hydrogen technology. In this review paper we summarize the latest findings on solid-state storage solutions of different non-equilibrium systems which have been synthesized by mechanical routes based on severe plastic deformation. Among these deformation techniques, high-pressure torsion is proved to be a proficient method due to the extremely high applied shear strain that develops in bulk nanocrystalline and amorphous materials.

Intermixing of Fe and Cu on the Atomic Scale by High-Pressure Torsion as Revealed by Dc- and Ac-Squid Susceptometry

2020 ◽  
Author(s):  
Martin Stückler ◽  
Heinz Krenn ◽  
Lukas Weissitsch ◽  
Stefan Wurster ◽  
Reinhard Pippan ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Atomic Scale
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