Effect of amorphous Mg{sub 50}Ni{sub 50} on hydriding and dehydriding behavior of Mg{sub 2}Ni alloy

Journal Article · Fri Apr 15 04:00:00 EDT 2011 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2011.02.007· OSTI ID:22063675

Guzman, D ^[1]; Ordonez, S ^[2]; Fernandez, J F; Sanchez, C ^[3]; Serafini, D ^[4]; Rojas, P A ^[5]; Aguilar, C ^[6]; Tapia, P ^[7]

---

1. Departamento de Ingenieria en Metalurgia, Facultad de Ingenieria, Universidad de Atacama y Centro Regional de Investigacion y Desarrollo Sustentable de Atacama (CRIDESAT), Av. Copayapu 485, Copiapo (Chile)
2. Departamento de Ingenieria Metalurgica, Facultad de Ingenieria, Universidad de Santiago de Chile, Av. Lib. Bernardo O'Higgins 3363, Santiago (Chile)
3. Departamento de Fisica de Materiales, Facultad de Ciencias, Universidad Autonoma de Madrid, Cantoblanco 28049, Madrid (Spain)
4. Departamento de Fisica, Facultad de Ciencias, Universidad de Santiago de Chile and Center for Interdisciplinary Research in Materials, CIMAT, Av. Lib. Bernardo O'Higgins 3363, Santiago (Chile)
5. Escuela de Ingenieria Mecanica, Facultad de Ingenieria, Av. Los Carrera 01567, Quilpue, Pontificia Universidad Catolica de Valparaiso, PUCV (Chile)
6. Departamento de Ingenieria Metalurgica y Materiales, Universidad Tecnica Federico Santa Maria, Av. Espana 1680, Valparaiso (Chile)
7. Departamento de Ingenieria en Metalurgia, Facultad de Ingenieria, Universidad de Atacama, Av. Copayapu 485, Copiapo (Chile)

Composite Mg{sub 2}Ni (25 wt.%) amorphous Mg{sub 50}Ni{sub 50} was prepared by mechanical milling starting with nanocrystalline Mg{sub 2}Ni and amorphous Mg{sub 50}Ni{sub 50} powders, by using a SPEX 8000 D mill. The morphological and microstructural characterization of the powders was performed via scanning electron microscopy and X-ray diffraction. The hydriding characterization of the composite was performed via a solid gas reaction method in a Sievert's-type apparatus at 363 K under an initial hydrogen pressure of 2 MPa. The dehydriding behavior was studied by differential thermogravimetry. On the basis of the results, it is possible to conclude that amorphous Mg{sub 50}Ni{sub 50} improved the hydriding and dehydriding kinetics of Mg{sub 2}Ni alloy upon cycling. A tentative rationalization of experimental observations is proposed. - Research Highlights: {yields} First study of the hydriding behavior of composite Mg{sub 2}Ni (25 wt.%) amorphous Mg{sub 50}Ni{sub 50}. {yields} Microstructural characterization of composite material using XRD and SEM was obtained. {yields} An improved effect of Mg{sub 50}Ni{sub 50} on the Mg{sub 2}Ni hydriding behavior was verified. {yields} The apparent activation energy for the hydrogen desorption of composite was obtained.

• OSTI ID: 22063675
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 4 Vol. 62; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ACTIVATION ENERGY
AMORPHOUS STATE
COMPOSITE MATERIALS
CRYSTALS
DESORPTION
HYDRIDATION
HYDROGEN STORAGE
MICROSTRUCTURE
MILLING
NANOSTRUCTURES
NICKEL ALLOYS
POWDERS
SCANNING ELECTRON MICROSCOPY
SOLIDS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION