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dc.contributor.authorNygård, Magnus Moe
dc.contributor.authorEk, Gustav
dc.contributor.authorKarlsson, Dennis
dc.contributor.authorSahlberg, Martin
dc.contributor.authorSørby, Magnus Helgerud
dc.contributor.authorHauback, Bjørn
dc.identifier.citationInternational journal of hydrogen energy. 2019nb_NO
dc.description.abstractWe have investigated the structure and hydrogen storage 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 powder 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) metal hydrides with hydrogen-to-metal ratios close to 2. No correlation between the hydrogen storage capacity and the local lattice strain 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 the other with a smaller unit cell than the original bcc alloy.
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.titleHydrogen storage in high-entropy alloys with varying degree of local lattice strainnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalInternational journal of hydrogen energynb_NO
dc.relation.projectNordforsk: 81942nb_NO
cristin.unitnameNøytron materialkarakterisering

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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Med mindre annet er angitt, så er denne innførselen lisensiert som Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal