Effect of Ni alloying on thermal stability and soft magnetic properties of Finemet alloy

doi:10.13251/j.issn.0254-6051.2021.12.019

Abstract

Abstract: Fe_73.5-xSi_13.5B₉Cu₁Nb₃Ni_x (x=0, 1, 2, 3) alloy strips were prepared by copper roller melt-spinning method and then treated by annealing. The phase structure, thermal stability and soft magnetic properties of the strips were tested by XRD, DSC, VSM and soft magnetic DC tester. The results show that the alloy strips are completely amorphous in the quenched state, and the two-phase coexistence structure of amorphous and α-Fe nanocrystalline are formed in the alloy after annealing at 560 ℃ for 60 min. With the increase of Ni content, the first initial crystallization temperature (T_s1) and the second initial crystallization temperature (T_s2) of the alloy strips decrease first and then increase on the whole. The difference value between the two initial crystallization temperatures (ΔT_s) shows a downward trend as a whole, from 166.0 ℃ to 132.8 ℃, and the thermal stability decreases. In the quenched state, the addition of Ni makes the soft magnetic properties of the amorphous strips deteriorate. After annealing, the soft magnetic properties of the strips are obviously improved. When the Ni content is x=1, the strip has better soft magnetic properties: saturation magnetization of 157.7 emu/g and the coercive force of 6.8 Oe.

Key words: Finemet amorphous alloy, Ni alloying, annealing, thermal stability, soft magnetic properties

CLC Number:

TG139⁺.8

Zhang Chaohan, Tao Pingjun, Zhu Kunsen, Huang Wenhao, Yang Yuanzheng. Effect of Ni alloying on thermal stability and soft magnetic properties of Finemet alloy[J]. Heat Treatment of Metals, 2021, 46(12): 119-123.

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