Microstructure and magnetic properties of Fe81.3Si4B13Cu1.7 nanocrystalline alloys with minor Nb addition

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Abstract The amorphous matrix containing dispersive high number density (Nd) ��-Fe nuclei with average grain sizes (D) of 4.3�C6.2 nm were formed in the melt-spun Fe81.3-xSi4B13Cu1.7Nbx (x = 0�C2) alloys, and the Nd and D values reduce with increasing the Nb content. The fine nanocrystalline structure with ��-Fe grains in size of 14.0�C21.6 nm was obtained for the alloys after annealing, which show high saturation magnetic flux density of 1.60�C1.77 T and low coercivity (Hc) of 7.1�C16.2 A/m. Addition of minor Nb significantly expands the optimum annealing temperature range for obtaining low Hc, while coarsens the ��-Fe grains, leading to a slight increase in the Hc. The mechanism for the effect of Cu and Nb elements on the structure and magnetic properties was discussed in terms of the formation and growth of the ��-Fe nuclei of the alloys.

Key words�� Fe-based nanocrystalline alloys Soft magnetic properties Cu content ��-Fe nuclei Nb alloying

Received: 05 December 2017 Published: 23 October 2018

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	Articles by authors
	XIANGCHENG -Ren
	YANHUI -Li

	ZHIYONG -Qiu
	GUOQIANG -Xie
	ZHANG Wei

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XIANGCHENG -Ren,YANHUI -Li,ZHIYONG -Qiu��. Microstructure and magnetic properties of Fe81.3Si4B13Cu1.7 nanocrystalline alloys with minor Nb addition[J]. Journal of Iron and Steel Research International, 2018, 25(6): 614-618.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/ OR http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/Y2018/V25/I6/614

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