Effect of Al on Bulk Amorphization and Magnetic Properties of FeSnPSiB Alloys

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  • Lin Chih-Yuan
    Department of Materials Science and Engineering, National Tsing Hua University
  • Chin Tsung-Shune
    Department of Materials Science and Engineering, National Tsing Hua University National United University
  • Chao Chih-Kang
    Department of Materials Science and Engineering, National Tsing Hua University
  • Zhou Siao-Xion
    State Key Laboratory for Amorphous Metals, Central Iron and Steel Institute
  • Lu Zhih-Chao
    State Key Laboratory for Amorphous Metals, Central Iron and Steel Institute
  • Wang Li
    State Key Laboratory for Amorphous Metals, Central Iron and Steel Institute
  • Chen Fei-Fei
    State Key Laboratory for Amorphous Metals, Central Iron and Steel Institute
  • Pan Ming-Xiang
    Institude of Physics, Chinese Academy of Science
  • Wang Wei-Hua
    Institude of Physics, Chinese Academy of Science

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Structure and magnetic properties of melt-spun multi-component Fe78−xAlxSn2P12 Si4B4 (x = 0, 3, 4, 5 at%) amorphous ribbons and copper-mold-cast rods were investigated. The improvement of thermal stability was recognized with the replacement of Fe by 3∼5 at% Al in these Sn-containing alloys. The super-cooled liquid region (ΔTx), defined by (Tx − Tg) where Tx is the crystallization temperature and Tg the glass transition temperature, increases from 46.5 K as x = 3 to the maximum value 50.2 K as x = 4. With increasing Al content, magnetic properties of annealed Fe78−xAlxSn2P12Si4B4 (x = 3∼5 at%) amorphous ribbons are: saturation magnetization decreases from 1.22 to 1.18 T; coercive force decreases from 3.3 to 2.2 A/m, maximum permeability increases from 137000 to 208000, Curie temperature lowers from 591.1 K to 578.3 K; the electrical resistivity increases from 175 to 188 μΩ-cm; and core loss is about 0.14 W/kg (50 Hz, 1.1 T external magnetic field). Bulk amorphous rods with 1 mm diameter were successfully demonstrated for the composition Fe74Al4Sn2P12Si4B4 by a copper mold casting method. Due to the combination of good glass forming ability and superior soft magnetic properties, these alloys will find potential applications in industries.

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