Effect of Y doping on surface crystallization and magnetic properties of a FeHfB nanocrystalline alloy
Effect of Y doping on surface crystallization and magnetic properties of a FeHfB nanocrystalline alloy
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DOI：
10.1016/j.jmmm.2022.169035
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发表时间：
2022-01
影响因子：
2.7
通讯作者：
Licheng Wu;Yanhui Li;Lin Qi;Wei Zhang
中科院分区：
文献类型：
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作者：
Licheng Wu;Yanhui Li;Lin Qi;Wei Zhang
Fe_（87）Hf_（58）合金在快淬非晶薄带的自由表面形成了一层织构化的粗大α-Fe晶粒，退火后纳米晶结构的均匀性变差，合金的矫顽力（Hc）高达16 A/m以上。掺杂0.1-0.2原子% Y的引入抑制了快淬前驱体的表面晶化，使整个退火带的纳米结构均匀细小。Y掺杂纳米晶合金具有较低的矫顽力（9A/m左右）和较高的饱和磁通密度（1.70T）。Y掺杂对表面晶化的抑制是由于提高了合金的非晶形成能力，而非晶形成能力的提高主要是由于Y掺杂降低了合金中的氧杂质含量。
A Fe87Hf5B8alloy forms a crystallization layer with textured coarse α-Fe grains in the free surface of the melt-spun amorphous ribbon, which deteriorates the uniformity of nanocrystalline structure after annealing and leads to a high coercivity (Hc) of over 16 A/m. Doping of 0.1–0.2 at.% Y into the Fe87Hf5B8alloy inhibits the surface crystallization of the melt-spun precursor and contributes to a uniform and fine nanostructure in the whole annealed ribbons. The Y-doped nanocrystalline alloys possess lowerHcof around 9 A/m and maintain high saturation magnetic flux density of 1.70 T. The suppression of the surface crystallization by Y doping is attributed to the improvement of amorphous-forming ability, which is mainly caused by the reduction of oxygen impurity content in the alloys.