Characterization of hydrogen sorption properties and microstructure of cast Mg-10wt%Ni alloys

Cho, Young Hee and Dahle, Arne K. (2010). Characterization of hydrogen sorption properties and microstructure of cast Mg-10wt%Ni alloys. In: T.Chandra, N.Wanderka, W.Reimers and M.Ionescu, Materials Science Forum: Thermec 2009. 6th International Conference on Processing and Manufacturing of Advanced Materials, Berlin, Germany, (1085-1090). 25-29 August, 2009. doi:10.4028/www.scientific.net/MSF.638-642.1085

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Author Cho, Young Hee
Dahle, Arne K.
Title of paper Characterization of hydrogen sorption properties and microstructure of cast Mg-10wt%Ni alloys
Conference name 6th International Conference on Processing and Manufacturing of Advanced Materials
Conference location Berlin, Germany
Conference dates 25-29 August, 2009
Convener The Minerals, Metals and Materials Society (TMS)
Proceedings title Materials Science Forum: Thermec 2009   Check publisher's open access policy
Journal name Materials Science Forum   Check publisher's open access policy
Place of Publication Stafa-Zurich, Switzerland
Publisher Trans Tech Publications Ltd
Publication Year 2010
Sub-type Fully published paper
DOI 10.4028/www.scientific.net/MSF.638-642.1085
Open Access Status
ISBN 0878492941
ISSN 0255-5476
Editor T.Chandra
N.Wanderka
W.Reimers
M.Ionescu
Volume 638-642
Issue Pts 1-4
Start page 1085
End page 1090
Total pages 6
Collection year 2011
Language eng
Abstract/Summary New Mg-10wt%Ni hydrogen storage alloys were fabricated by casting which is a very simple and cost effective production process. Alloying elements such as Nb and Ti, which have relatively high melting temperatures and very low solubility in solid Mg, were successfully dissolved into the liquid Mg-Ni alloy. The Mg-Mg2Ni alloys contain a well-refined lamellar eutectic microstructure after solidification with a large interfacial area between the Mg and Mg2Ni phases which provides for good hydrogen sorption properties. This is considered to be due to the high diffusivity of hydrogen along the interphase boundaries. Addition of transition metals such as Nb and Ti results in the formation of intermetallic phases with a size about 10-20μm during solidification. Furthermore, Ti was found to be strongly segregated to the eutectic Mg-Mg2Ni interface. In the presence of Nb and Ti, the hydrogen sorption kinetics of the Mg-Mg2Ni alloy is further improved. This suggests that the transition metals act as active catalysts that eases and accelerates the hydrogen diffusion during hydrogenation and dehydrogenation. In this paper, we present the hydrogen storage properties and their relationship to the microstructure of the cast Mg-10wt%Ni alloys. Detailed microstructural analysis was carried out in order to further understand the hydrogen diffusion and storage mechanisms.
Subjects 0912 Materials Engineering
E1
Keyword Evolution
Systems
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Sun, 12 Sep 2010, 00:04:42 EST