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Indexed by:期刊论文

Date of Publication:2016-01-15

Journal:JOURNAL OF NON-CRYSTALLINE SOLIDS

Included Journals:SCIE、EI、Scopus

Volume:432

Page Number:453-458

ISSN No.:0022-3093

Key Words:Fe-B amorphous alloys; Cluster-plus-glue-atom model; Cluster formula; Glass-forming ability

Abstract:Fe-B binary alloys constitute the basis of many Fe-based metallic glasses with-superior glass forming abilities and soft magnetic properties. The present work is devoted to understanding the composition rule of Fe-B binary amorphous alloys using the cluster-plus-glue-atom model and the relevant composition formula theory. According to this model, an ideal metallic glass is based on a chemical building block composed of a first-neighbor coordination polyhedral cluster plus one or three glue atoms, and the total number of valence electrons per unit formula is close to 24. For the Fe-B system, the principal cluster [B-B2Fe8], which enters into the composition formula for metallic glasses, is derived from the eutectic phase BFe2 (Al2Cu-type). This cluster, after being glued with one Fe atom, produces a cluster formula [B-B2Fe8]Fe=B3Fe9=Fe75B25 that presents nearly 24 valence electrons. Experimental verification was then carried out, and at the anticipated composition, the crystallization temperature and glass-forming ability indicator a was the highest, indicating the best thermal stability and glass-forming ability. The crystallization behavior and structure characteristics of Fe-B binary amorphous alloys were also discussed. (C) 2015 Elsevier B.V. All rights reserved.