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Enhancement of the glass-forming ability by Zr microalloying and its influence on the magnetocaloric properties of bulk amorphous Gd-Co-Al

TitleEnhancement of the glass-forming ability by Zr microalloying and its influence on the magnetocaloric properties of bulk amorphous Gd-Co-Al
Publication TypeJournal Article
Year of Publication2010
AuthorsFu H, Zou M, Mudryk Y, Pecharsky VK, Gschneidner KA
Journal TitleJournal of Applied Physics
Volume108
Pages053916
Date Published09/01
ISBN Number0021-8979
Accession NumberISI:000282478900070
KeywordsADDITIONS, alloys, DY, HO, metallic glasses, tb
Abstract

Microalloying with 1 at. % zirconium dramatically increases the critical size from 3 to 8 mm for Gd-based bulk metallic glasses (BMGs). The enhancement of glass-forming ability originates from the increase in the packing efficiency and high compound forming tendency between Zr and major constituent elements. The maximum magnetic entropy change (-Delta S-Mmax) and relative cooling power (RCP) of Gd52.5Co18.5Al29-xZrx (x=1) BMG are 9.6 J/kg K and 8.9 x 10(2) J/kg, respectively. Heat capacity data demonstrate that the broad magnetic transition arising from topological disorder is responsible for the high RCP of Gd-based amorphous magnetocaloric materials. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3481923]
URL<Go to ISI>://000282478900070http://link.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JAPIAU000108000005053916000001
DOI10.1063/1.3481923
Alternate JournalJ Appl Phys