Hydrogen-induced phase transition of MgZrTiFe0.5Co0.5Ni0.5 high entropy alloy

Zepon, Guilherme; Leiva, Daniel Rodrigo; Strozi, Renato Belli; Bedoch, Audrey Marie; Figueroa, Santiago; Ishikawa, Tomaz Toshimi; Filho, Walter José Botta

doi:10.1016/j.ijhydene.2017.11.106

Cited by 136 publications

(78 citation statements)

References 17 publications

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“…We proposed that the hydride phase is bct and the deuterium atoms occupy the tetrahedral interstitial sites. However, it was recently claimed in the literature that other refractory MPEAs form fcc hydrides [8,10,13,21]. This is not surprising since our XRD analyses can be performed based on both fcc and bct lattices and the bct can be seen as a slightly distorted fcc structure.…”

Section: Discussionmentioning

confidence: 59%

TiVZrNb Multi-Principal-Element Alloy: Synthesis Optimization, Structural, and Hydrogen Sorption Properties

Montero

Zlotea

et al. 2019

Molecules

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While the overwhelming number of papers on multi-principal-element alloys (MPEAs) focus on the mechanical and microstructural properties, there has been growing interest in these alloys as solid-state hydrogen stores. We report here the synthesis optimization, the physicochemical and the hydrogen sorption properties of Ti0.325V0.275Zr0.125Nb0.275. This alloy was prepared by two methods, high temperature arc melting and ball milling under Ar, and crystallizes into a single-phase bcc structure. This MPEA shows a single transition from the initial bcc phase to a final bct dihydride and a maximum uptake of 1.7 H/M (2.5 wt%). Interestingly, the bct dihydride phase can be directly obtained by reactive ball milling under hydrogen pressure. The hydrogen desorption properties of the hydrides obtained by hydrogenation of the alloy prepared by arc melting or ball milling and by reactive ball milling have been compared. The best hydrogen sorption properties are shown by the material prepared by reactive ball milling. Despite a fading of the capacity for the first cycles, the reversible capacity of the latter material stabilizes around 2 wt%. To complement the experimental approach, a theoretical investigation combining a random distribution technique and first principle calculation was done to estimate the stability of the hydride.

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Section: Discussionmentioning

confidence: 59%

TiVZrNb Multi-Principal-Element Alloy: Synthesis Optimization, Structural, and Hydrogen Sorption Properties

Montero

Zlotea

et al. 2019

Molecules

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“…Despite this interesting feature and the massive number of possible new compositions, limited studies on hydrogen sorption properties have been reported previously. [6][7][8][9][10][11][12][13] Among all MPEAs, our interest lays in bcc alloys containing refractory elements since these individual metals can absorb large amount of hydrogen forming hydride with a maximum capacity of 2 H/M. [14] Our first study on the bcc TiVZrNbHf composition exceeded this limit and reported a capacity of 2.5 H/M, which made the refractory MPEAs a very promising class of materials for solid-state hydrogen storage.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen storage properties of the refractory Ti–V–Zr–Nb–Ta multi-principal element alloy

Montero

Laversenne

et al. 2020

Journal of Alloys and Compounds

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A new quinary multi-principal element alloy Ti0.30V0.25Zr0.10Nb0.25Ta0.10 was prepared by high temperature melting technique and the physicochemical as well as hydrogen sorption properties have been determined. The as-cast alloy crystallizes into a single-phase bcc lattice and can very quickly absorb hydrogen at room temperature forming a fcc hydride phase with capacity of 2 H/M (2.5 wt.%). The absorption/desorption of hydrogen is reversible and occurs within one step, as proven by in situ neutron diffraction for the desorption reaction. The capacity is slightly fading during the first 10 cycles and then stabilizes at around 2.2 wt.% for the next 10 cycles.

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“…It is expected that the HEA-concept will allow a larger degree of tunability in the properties of the corresponding metal hydrides. However, hydrogen storage in HEAs is still in its infancy with only a few reported studies [9][10][11][12][13][14][15][16][17][18][19] was placed inside an alumina crucible equipped with a pierced lid. The measurement was then conducted under flowing Ar at 50 mL/min.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen storage in high-entropy alloys with varying degree of local lattice strain

Nygård

Karlsson

et al. 2019

International Journal of Hydrogen Energy

106

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We have investigated the structure and hydrogenation properties of a series of Ti, V, Zr, Nb and Ta based high-entropy alloys (HEAs) with varying degree of local lattice strain by means of synchrotron radiation X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry and manometric measurements in a Sieverts apparatus. The obtained alloys have body-centred cubic (bcc) crystal structures and form face-centred cubic (fcc) hydrides with hydrogen-to-metal ratios close to 2. No correlation between the hydrogen storage capacity and the local lattice strain δr is observed in this work. Both bcc and fcc unit cells expand linearly with the zirconium-to-metal ratio [Zr]/[M], and increased concentration of Zr stabilizes the hydrides. When heated, the hydrides decompose into the original bcc alloys if [Zr]/[M]<12.5 at.%. The hydrides phase-separate in a hydrogen-induced decomposition type process for [Zr]/[M]≥12.5 at.%. The result is then a combination of two bcc phases, one with a larger and

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Hydrogen-induced phase transition of MgZrTiFe0.5Co0.5Ni0.5 high entropy alloy

Cited by 136 publications

References 17 publications

TiVZrNb Multi-Principal-Element Alloy: Synthesis Optimization, Structural, and Hydrogen Sorption Properties

TiVZrNb Multi-Principal-Element Alloy: Synthesis Optimization, Structural, and Hydrogen Sorption Properties

Hydrogen storage properties of the refractory Ti–V–Zr–Nb–Ta multi-principal element alloy

Hydrogen storage in high-entropy alloys with varying degree of local lattice strain

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