ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
AB2 metallic alloys provide large quantities of Laves phases when prepared usingconventional thermal routes. In the present work the crystallography, hydrogenation behavior andmechanical milling (MM) effects of the pseudo-binary Zr(NbxV1-x)2 (0〈x≤0.65) system are studied.It is found that the partial replacement of V by Nb atoms leads to the formation of cubic C15(0〈x≤0.20) and hexagonal C14 (0.35≤x≤0.65) Laves phases. For x≤0.20, the niobium additionspromote a slight increase of the hydrogen storage capacity by the C15 phases. For 0.35≤x≤0.65, thereduction of the molar fraction of the C14 phase promotes an increase of the alloy hydrogen storagecapability. Iron incorporation plays a major role on the type of final mechanically-milled Zr-Nb-Valloys obtained: a transformation from Laves phases (C14 and C15) to an fcc (Fm3m) one; while, inthe absence of Fe, amorphization of the system was observed, as predicted by Miedema Model. Asa general result, the mechanical milling of the Zr-Nb-V alloys results in a reduction of the hydrogenstorage capacity, at least for long processing times
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.570.45.pdf
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