Microstructure and magnetocaloric effects in partially amorphous Gd55Co15Al30-xSix alloys

TitleMicrostructure and magnetocaloric effects in partially amorphous Gd55Co15Al30-xSix alloys
Publication TypeJournal Article
Year of Publication2011
AuthorsFu H, Zou M, Cao Q, Pecharsky VK, Gschneidner KA, Chumbley LS
Journal TitleMaterials Science and Engineering a-Structural Materials Properties Microstructure and Processing
Date Published06
Type of ArticleArticle
ISBN Number0921-5093
Accession NumberISI:000291125900046
Keywordsbulk metallic glasses, magnetocaloric effect, rare earth

In order to clarify the phase components and further improve the glass-forming ability of Gd55Co15Al30 alloy, substitution of Al with Si was adopted. Although the X-ray powder diffraction experiment indicated an amorphous structure of the Gd55Co15Al30-xSix (x = 1, 2, 3) alloys, precipitation of crystalline Gd2Al phase was evident from the energy-dispersive spectroscopy, selected-area diffraction, and magnetization measurements. The magnetocaloric effect of Si substituted alloys is lower than that of Gd52.5Co16.5Al31 alloy with a similar composition and full amorphous structure, which is ascribed to the presence of antiferromagnetic Gd2Al phase whose magnetic entropy change is lower. (C) 2011 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000291125900046
Alternate JournalMater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.