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Indexed by:期刊论文

Date of Publication:2014-02-15

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI

Volume:586

Issue:SUPPL. 1

Page Number:S294-S297

ISSN No.:0925-8388

Key Words:Hard magnetic materials; Melt spinning; Amorphous alloys; Annealing; Nanocomposite structure

Abstract:The structure, thermal stability and magnetic properties of melt-spun Fe55Pt25B20-xPx (x = 0-5) alloys have been investigated. Addition of P increases the amorphous-forming ability of an Fe55Pt25B20 alloy, leading to the formation of the full amorphous phase. After annealing, the homogeneous nanosized structure consisting of hard L1(0)-FePt and soft Fe2B magnetic phases with average grain size of similar to 40 nm are obtained for the alloys with x = 0 and 2, while a L1(0)-FePt/Fe2B nanocomposite structure with an average grain size of similar to 80 nm is obtained for the alloy with x = 5. As the P content increases, the coercivity (H-i(c)) of the L1(0)-FePt/Fe2B nanocomposite alloys significantly increases, the remanence (B-r) decreases. The alloy with x = 5 shows the largest H-i(c) of 12.1 kOe, while the alloy with x = 2 exhibits higher B-r of 53.5 emu/g and better demagnetization curve squareness, which is due to the enhancement in exchange coupling among the uniformly distributed nanosized Fe2B and L1(0)-FePt phases. (C) 2012 Elsevier B. V. All rights reserved.