Mg<inf>2</inf>Nni<inf>0.5</inf>Co<inf>0.5</inf>compound obtaining by mechanical alloying and their performance on hydriding process

Carola Martínez, Stella Ordoñez, Danny Guzmán, Daniel Serafini, Paula Rojas, Claudio Aguilar

Research output: Contribution to journalArticle

Abstract

© The author; licensee Universidad Nacional de Colombia. This work presents the microstructural evolution of mechanically alloyed Mg2Ni0.5Co0.5and a study of its hydriding properties. Mg, Ni, and Co elemental powders (atomic ratios of 2:0.5:0.5, respectively) were mechanically alloyed in a Spex 8000D high-energy mill for 36 h (amorphous sample) and subsequently submitted to a thermal treatment at 673 K for 15 min (nanocrystalline sample). The characterizations of the samples were performed with X-ray diffraction. A Sievert-type volumetric hydriding process was done at 363 K and with hydrogen pressure of 2 MPa. Desorption process was evaluated through differential scanning calorimetry. Based on the obtained results, it is possible to conclude that the amorphous structure absorbs more hydrogen, reaching a maximum of 3.6 wt. % H. Desorption process events depend on amorphous or nanocrystalline states.
Original languageEnglish
Pages (from-to)240-246
Number of pages7
JournalDYNA (Colombia)
DOIs
Publication statusPublished - 1 Jan 2017

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