Formation, Crystallized Structure and Magnetic Properties of Fe-Pt-B Amorphous Alloys
Formation, Crystallized Structure and Magnetic Properties of Fe-Pt-B Amorphous Alloys
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DOI：
10.2320/matertrans.46.891
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发表时间：
2005-04
影响因子：
1.2
通讯作者：
A. Inoue;Wei Zhang;T. Tsurui;D. Louzguine
中科院分区：
文献类型：
--
作者：
A. Inoue;Wei Zhang;T. Tsurui;D. Louzguine
结果表明，（Fe 0 . 7 5点0分。25）采用快淬法制备100- x B x（x = 25和30）合金。它们的晶化温度分别为671和667 K。非晶合金具有良好的软磁性能。经785 K × 900 s退火后，合金的晶化组织由γ 1 Feft（fct）、Fe 2 B和γ FePt（fcc）相组成，其平均晶粒尺寸约为15 nm。25at% B合金的剩磁（B r）、折合剩磁（Mr/Ms）、矫顽力（iHc）和最大磁能积（BH）max分别为0.96T、0.83、340 kA/m和102.2kJ/m3; 30at% B合金的剩磁（Br）、折合剩磁（Mr/Ms）、矫顽力（iHc）和最大磁能积（BH）max分别为0.91T、0.82、368 kA/m和96.5kJ/m3。可逆的退磁回路行为也得到了证实。结果表明，该合金具有良好的硬磁性能，这是由于纳米级硬γ 1 FePt与软Fe 2 B和γ FePt磁性相之间的交换磁耦合作用所致。
An amorphous phase was formed for (Fe 0 . 7 5 Pt 0 . 2 5 ) 1 0 0 - x B x (x = 25 and 30) alloys by melt-spinning. Their crystallization temperature were 671 and 667 K, respectively. The amorphous alloys exhibited good soft magnetic properties. The crystallized structure consisted of γ 1 -Feft (fct), Fe 2 B and γ-FePt (fcc) phases, and their average grain sizes were about 15 nm after annealing at 785 K for 900s. The remanence (B r ), reduced remanence (M r /M s ), coercivity (iH c ) and maximum energy product (BH) m a x were 0.96 T, 0.83,340 kA/m and 102.2 kJ/m 3 , respectively, for the 25at%B alloy, and 0.91 T, 0.82, 368 kA/m and 96.5 kJ/m 3 , respectively, for the 30 at% B alloy. The reversible demagnetization loop behavior was also confirmed. Consequently, the good hard magnetic properties are interpreted as resulting from exchange magnetic coupling among nanoscale hard γ 1 -FePt and soft Fe 2 B and γ-FePt magnetic phases.