Synthesis and magnetic properties of Fe–Pt–B nanocomposite permanent magnets with low Pt concentrations
Synthesis and magnetic properties of Fe–Pt–B nanocomposite permanent magnets with low Pt concentrations
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DOI：
10.1063/1.1824172
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发表时间：
2004-11
影响因子：
4
通讯作者：
Wei Zhang;D. Louzguine;A. Inoue
中科院分区：
文献类型：
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作者：
Wei Zhang;D. Louzguine;A. Inoue
研究了熔融纺Fe80−xPtxB20 （x=20,22,24）合金带的显微组织和磁性能。在熔融纺丝带中形成了非晶态和fcc γ-FePt相的均匀纳米级混合结构。非晶相和fcc γ-FePt相的平均尺寸约为5nm，在共存的非晶相中发现了B的富集现象。熔融纺丝带具有软磁特性。在798K退火900s后得到了由fct γ- 1- fept、fcc γ-FePt和Fe2B相组成的纳米复合结构，其平均晶粒尺寸约为20nm。纳米复合合金的剩余物（Br）、还原剩余物（Mr∕Ms）、矫顽力（Hci）和最大能积（BH）max分别在0.93 ~ 1.05 t、0.79 ~ 0.82、375 ~ 487 ka∕m和118 ~ 127 kj∕m3之间。良好的硬磁性能可以解释为纳米级硬磁γ-FePt与软磁fcc γ-FePt或Fe2B p之间的交换磁耦合的结果。
Microstructure and magnetic properties of melt-spun Fe80−xPtxB20 (x=20,22,24) alloy ribbons have been investigated. A homogeneous nanoscale mixed structure with amorphous and fcc γ-FePt phases was formed in the melt-spun ribbons. The average sizes of the amorphous and fcc γ-FePt phases are about 5nm, and the enrichment phenomenon of B is recognized in the coexistent amorphous phase. The melt-spun ribbons exhibit soft magnetic properties. The nanocomposite structure consisting of fct γ1-FePt, fcc γ-FePt, and Fe2B phases was obtained in the melt-spun ribbons annealed at 798K for 900s, and their average grain sizes are about 20nm. The remanence (Br), reduced remanence (Mr∕Ms), coercivity (Hci), and maximum energy product (BH)max of the nanocomposite alloys are in the range of 0.93–1.05T, 0.79–0.82, 375–487kA∕m, and 118–127kJ∕m3, respectively. The good hard magnetic properties are interpreted as resulting from exchange magnetic coupling between nanoscale hard fct γ1-FePt and soft magnetic fcc γ-FePt or Fe2B p...