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Microstructure and De-/hydrogenation behavior of melt-spun Mg-Ni-Y alloys as hydrogen storage materials

Mikrogefüge und Dehydrier-/Hydrierverhalten von schmelzgesponnenen Mg-Ni-Y-Legierungen als Wasserstoffspeicherlegierungen
 
: Röntzsch, L.; Kalinichenka, S.; Kieback, B.

Kainer, K.U. ; Deutsche Gesellschaft für Materialkunde e.V. -DGM-, Oberursel:
Magnesium. 8th International Conference on Magnesium Alloys and their Applications 2009 : 26-29 October 2009, Weimar
Weinheim: Wiley-VCH, 2010
ISBN: 978-3-527-32732-4
ISBN: 3-527-32732-0
S.1085-1090
International Conference on Magnesium Alloys and their Applications <8, 2009, Weimar>
Englisch
Konferenzbeitrag
Fraunhofer IFAM, Institutsteil Pulvermetallurgie und Verbundwerkstoffe Dresden ()
Dehydrierung; Hydrieren; Kristallstruktur; MgNi-Legierung; Mikrogefüge; nanokristalline Legierung; Schmelzspinnen; Wasserstoffspeicherlegierung; Yttriumhydrid; Yttriumzusatz

Abstract
In this contribution, nanocrystalline magnesium-rich Mg-Ni-Y alloys were produced by melt-spinning and were studied in view of their crystal structure, crystallization behaviour and their cyclic hydrogenation/dehydrogenation properties that render them attractive materials for the reversible storage of hydrogen. The alloy composition was chosen for several reasons: From the literature it is known that the addition of Ni to Mg significantly improves the hydriding/dehydriding kinetics and decreases the working temperature compared to that of pure Mg. Further, Y is widely known as glass-forming element in Mg alloys. Moreover, ultrafine yttrium hydride particles improve the hydrogen sorption kinetics of Mg. Finally, ultra-fine crystal phases like yttrium hydrides might stabilize the nanostructure of the alloys by preventing further crystal coarsening during thermal processing.

: http://publica.fraunhofer.de/dokumente/N-139125.html