TY - JOUR
T1 - Melt-spun L10 Fe-Pt-(Zr, Nb and Ti)-B nanocrystalline alloys with high coercivity
AU - Makino, Akihiro
AU - Bitoh, Teruo
AU - Inoue, Akihisa
AU - Hirotu, Yoshihiko
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007/3/25
Y1 - 2007/3/25
N2 - The additional effect of Zr, Nb and Ti to the melt-spun Fe-Pt-B alloys has been investigated. An L10-FePt nanocrystalline structure with a grain size less than 100 nm and coercivity (Hc) higher then 200 kA/m were obtained for the melt-spun (Fe0.55Pt0.45)-M-B (M = Zr, Nb and Ti) alloys without any annealing treatment. The simultaneous addition of M and B to near equiatomic FePt alloys remarkably decreases the melting temperature to the temperature under the order-disorder transformation temperature of the FePt phase. Therefore, the nanocrystalline L10-FePt phase should be directly synthesized without allowing the formation of the disordered fcc phase during the rapid solidification because the temperature region where the fcc phase is stable does not exist. The low melting temperature that resulted from the addition of M and B, presumably because of the strong interaction of Pt-M pairs, appears to facilitate the formation of the ordered L10 nanocrystalline phase during the rapidly quenching method of the alloy melt.
AB - The additional effect of Zr, Nb and Ti to the melt-spun Fe-Pt-B alloys has been investigated. An L10-FePt nanocrystalline structure with a grain size less than 100 nm and coercivity (Hc) higher then 200 kA/m were obtained for the melt-spun (Fe0.55Pt0.45)-M-B (M = Zr, Nb and Ti) alloys without any annealing treatment. The simultaneous addition of M and B to near equiatomic FePt alloys remarkably decreases the melting temperature to the temperature under the order-disorder transformation temperature of the FePt phase. Therefore, the nanocrystalline L10-FePt phase should be directly synthesized without allowing the formation of the disordered fcc phase during the rapid solidification because the temperature region where the fcc phase is stable does not exist. The low melting temperature that resulted from the addition of M and B, presumably because of the strong interaction of Pt-M pairs, appears to facilitate the formation of the ordered L10 nanocrystalline phase during the rapidly quenching method of the alloy melt.
KW - Hard magnetic properties
KW - Iron-platinum alloy
KW - Melt-spinning technique
KW - Ordered L1 phase
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U2 - 10.1016/j.msea.2006.02.349
DO - 10.1016/j.msea.2006.02.349
M3 - Article
AN - SCOPUS:33847222653
VL - 448-451
SP - 66
EP - 70
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -