Fabrication of Mg2NiHx from Mg and Ni Chips by Hydrogen Induced Planetary Ball Milling

For manufacturing Mg2NiHx hydrogen absorbing materials economically, Mg and Ni chips were mechanically alloyed under 2 MPa hydrogen atmosphere by planetary ball milling. The homogeneous Mg2NiHx was formed after 72 h mechanical alloying (MA) in both 30:1 and 66:1 BCR (ball to chips mass ratio). The m...

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Bibliographic Details
Published inMaterials Transactions, JIM Vol. 41; no. 3; pp. 393 - 398
Main Authors Hong, T. W., Kim, S. K., Park, G. S., Kim, Y. J.
Format Journal Article
LanguageEnglish
Published Sendai The Japan Institute of Metals 2000
Japan Institute of Metals
Subjects
Applied sciences
BCR (ball to chips mass ratio)
Cross-disciplinary physics: materials science; rheology
dehydriding reaction
Exact sciences and technology
hydrogen content
Materials science
Materials synthesis; materials processing
mechanical alloying
Metals. Metallurgy
nanocrystalline and amorphous Mg2NiHx
Physics
Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
Nickel base alloys
Hydrogen storage
Crushing
Magnesium alloys
Hydrides
XRD
Experimental study
Powder metallurgy
Mechanical alloying
Hydrogenation
TGA
Binary alloys
Hydrogen charging
Nanostructured materials
TEM
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Summary:For manufacturing Mg2NiHx hydrogen absorbing materials economically, Mg and Ni chips were mechanically alloyed under 2 MPa hydrogen atmosphere by planetary ball milling. The homogeneous Mg2NiHx was formed after 72 h mechanical alloying (MA) in both 30:1 and 66:1 BCR (ball to chips mass ratio). The maximum absorbed hydrogen content of the Mg2NiHx reached 3.9 mass% after 48 h MA in 30:1 BCR and the dehydriding reaction of them started around 473∼503 K from the result of TG analysis. On the other hand, in 66:1 BCR, the fully hydrogenated alloys were obtained after 96 h MA, the total hydrogen content was 2.25 mass% and the dehydriding temperature was around 453∼493 K. The composite phase obtained after 96 h MA in 66:1 BCR is composed of the nanocrystalline and amorphous phases, the structure of which seems to be the reason of the improved hydriding and dehydriding kinetics. It was deduced that the conditions of BCR affected strongly the synthesis of the Mg2NiHx.
ISSN:0916-1821
2432-471X
DOI:10.2320/matertrans1989.41.393