Influence of Mechanical Milling on Microstructure and Electrochemical Properties of Mg2Ni Hydrogen Storage Alloy Prepared by Low-Temperature Solid-Phase Sintering

Tian Xiao; Jing Yan; Ru Xia Duan; Naren Gerile

doi:10.4028/www.scientific.net/SSP.271.28

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HomeSolid State PhenomenaSolid State Phenomena Vol. 271Influence of Mechanical Milling on Microstructure...

Influence of Mechanical Milling on Microstructure and Electrochemical Properties of Mg₂Ni Hydrogen Storage Alloy Prepared by Low-Temperature Solid-Phase Sintering

Abstract:

The alloy with the composition of Mg₂Ni prepared by low-temperature solid-phase sintering was mechanically milled for 10, 25, 40 and 50 h. The microstructures and electrochemical properties of the Mg₂Ni alloys were investigated by X-ray diffraction (XRD), optical microscope (OM) and electrochemical measurements. Furthermore, two broadening effects of XRD peaks caused by crystallite size and lattice strain were separated by the approximate function method and least square method. Crystallite size and lattice strain of the alloy were calculated. The results showed that sintered and milled alloys consist of the Mg₂Ni phase. The milled alloys transform partly into nanocrystalline/amorphous structures during the milling process. By calculation, the crystallite size decreases and the lattice strain in the alloy decreases first and then increases with increasing milling time. The discharge capacities of the sintered alloy are significantly improved by milling. The maximum discharge capacities of the milled alloys increase with the increasing milling time.

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Periodical:

Solid State Phenomena (Volume 271)

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28-33

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.271.28

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Online since:

January 2018

Authors:

Tian Xiao*, Jing Yan, Ru Xia Duan, Naren Gerile

Keywords:

Electrochemical Property, Low-Temperature Solid-Phase Sintering, Mechanical Milling, Mg₂Ni Hydrogen Storage Alloy, Microstructure

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