Ferromagnetic element microalloying and clustering effects in high Bs Fe-based amorphous alloys

Abstract

Abstract:

Fe₈₃(Co_x,Ni_y)(B₁₁Si₂P₃C₁)_1-_x_,_y_/17 (x, y = 1-3) amorphous alloys with high saturation magnetic flux density (B_s) and excellent soft-magnetic properties were developed and then the microalloying and clustering effects were explored. The microalloying of Co and Ni improves the B_s from 1.65 T to 1.67-1.72 T and 1.66-1.68 T, respectively. The Ni-doped alloys exhibit better soft-magnetic properties, containing a low coercivity (H_c) of about 5.0 A/m and a high Effective permeability (μ_e) of (8-10) × 10³, whereas the microalloying of Co leads to a deteriorative H_c of 5.0-13.0 A/m and a μ_e of (5-8) × 10³. Moreover, microalloying of Ni can increase the ductile-brittle transition (DBT) temperature of the ribbons, while a totally opposite effect is found in the Co-doped alloys. The formation of dense α-Fe(Co,Ni) clusters during annealing process is used to explain the distinct effects of Co and Ni microalloying on the magnetic properties and bending toughness.

Key words: Amorphous alloy, Microalloying, High B_s, Domain structure, Cluster

Pingbo Chen, Tao Liu, Fengyu Kong, Anding Wang, Chunyan Yu, Gang Wang, Chuntao Chang, Xinmin Wang. Ferromagnetic element microalloying and clustering effects in high B_s Fe-based amorphous alloys[J]. J. Mater. Sci. Technol., 2018, 34(5): 793-798.

Figures/Tables 8

Fig 1. XRD patterns of the as-spun Fe83(Cox,Niy)(B11Si2P3C1)1-x,y/17 (x, y = 0-4) alloys.

Fig. 2. DSC curves of the Fe83(Cox,Niy)(B11Si2P3C1)1-x,y/17 (x, y = 0-3) amorphous alloys.

Fig. 3. Changes of Hc curves for (a) Fe83Niy(B11Si2P3C1)1-y/17 (y = 0-3) and (b) Fe83Cox(B11Si2P3C1)1-x/17 (x = 0-3) amorphous alloys as a function of TA for 10 min.

Fig. 4. Changes of μe curves for (a) Fe83(B11Si2P3C1)1-y/17Niy (y = 0-3) and (b) Fe83(B11Si2P3C1)1-x/17Cox (x = 0-3) amorphous ribbons as a function of TA for 10 min.

Fig. 5. TA dependence of the bending toughness of (a) Fe83Niy(B11Si2P3C1)1-y/17 (y = 0-3) and (b) Fe83Cox(B11Si2P3C1)1-x/17 (x = 0-3) amorphous ribbons annealed for 10 min.

Fig. 6. Changes of Bs for as-spun and annealed Fe83(Cox,Niy)(B11Si2P3C1)1-x,y/17 (x, y = 0-3) amorphous alloys.

Fig. 7. (a) XRD pattern of as-spun and annealed Fe83Co2(B11Si2P3C1)1-2/17 ribbon samples; (b) DSC curves of as-spun and annealed ribbon samples; Bright-field HRTEM and Selected area diffraction (SAED) (insert) pattern of (c) as-spun and (d) annealed Fe83Co2(B11Si2P3C1)1-2/17 amorphous alloys.

Fig. 8. Magnetic domains of (a) Fe83Co3(B11Si2P3C1)1-3/17 and (b) Fe83Ni3(B11Si2P3C1)1-3/17 amorphous alloys annealed at optimal temperature.

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