Iron-Based Amorphous Magnetic Properties by Ni Content Tuning and Isothermal Treatment

Abstract:

In this work, we have developed a series of amorphous alloy ribbons of Fe₇₅Co₄B₁₃Y₄Nb_4-xNi_x(x=0, 0.5, 1, 2, 3 and 4) which were prepared by industrial purity alloy. Besides, the effects of Ni substitution and isothermal annealing on the saturation magnetization (M_s) and intrinsic coercive force (jH_c) were systematically investigated. The SQUID-VSM data pointed out the M_s has been increased by Ni content addition with largest enhanced by 57 % from 114 emu/g to 180 emu/g. After quickly annealing at the optimal temperature, the M_s reached 199 emu/g and jH_c decreased from 50 Oe to 33 Oe. DSC measurements displayed that this system has a multi-step crystallization in the heating process. Under the premise of maintaining the excellent amorphous forming ability (AFA), the gap between the two crystallization peaks was broadened with Ni addition, which is good to the forming of α-Fe phase at the annealing treatment. And this was also consistent with the X-ray diffractometer (XRD) results. The Scherrer formula calculated results suggested that isothermal annealing has significant effect on size of α-Fe nanocrystals in annealing process, which obvious affect the M_s and jH_c. The annealing temperature and time can not only affect the precipitation of nano-crystalline, but also control the grain size. Hence, an appropriate annealing process is very important to improve the properties of these iron-based nanocrystalline magnetic materials. In conclusion, the results will help us to understand the influence of Ni elements and isothermal annealing on the microstructure and magnetic of Fe₇₅Co₄B₁₃Y₄Nb_4-xNi_x amorphous alloys.

• Periodical: Materials Science Forum (Volume 913)
• Pages: 661-667
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.913.661
• Online since: February 2018
• Authors: Peng Fei Liu, Wen Jun Chen, Jun Jun Li, Ru Long Zhou, Bo Zhang*
• Keywords: Amorphous, Ferromagnetic Materials, Isothermal Annealing, Ni

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