Microstructure and soft-magnetic properties of FeCoPCCu nanocrystalline alloys

doi:10.1016/j.jmst.2019.03.030

Abstract

Abstract:

Fe_83.2-xCo_xP₁₀C₆Cu_0.8 (x = 0, 4, 6, 8 and 10) alloys with a high amorphous-forming ability and good soft-magnetic properties were successfully synthesized. Saturation magnetic flux density (B_s) is effectively enhanced from 1.53 T to 1.61 T for as-quenched alloy by minor Co addition, which is consistent well with the result of the linear relationship between average magnetic moment and magnetic valence. For Co-contained alloys, the value of corecivity (H_c) is mainly determined by magneto-crystalline anisotropy, while effective permeability (μ_e) is dominated by grain size and average saturation polarization. After proper heat treatment, the Fe_79.2Co₄P₁₀C₆Cu_0.8 nanocrystalline alloy exhibited excellent soft-magnetic properties including a high B_s of 1.8 T, a low H_c of 6.6 A/m and a high μ_e of 15,510, which is closely related to the high volume fraction of α-(Fe, Co) grains and refined uniform nanocrystalline microstructure.

Key words: Anocrystalline alloy, Microstructure, Co addition, Soft-magnetic properties, Ferromagnetic exchange-coupling

Long Hou, Xingdu Fan, Qianqian Wang, Weiming Yang, Baolong Shen. Microstructure and soft-magnetic properties of FeCoPCCu nanocrystalline alloys[J]. J. Mater. Sci. Technol., 2019, 35(8): 1655-1661.

Figures/Tables 10

Fig. 1. XRD patterns of AQ Fe83.2-xCoxP10C6Cu0.8 (x = 0, 4, 6, 8 and 10) alloy ribbons.

Fig. 2. DSC curves of AQ Fe83.2-xCoxP10C6Cu0.8 (x = 0, 4, 6, 8 and 10) alloy ribbons with a heating rate of 0.67 °C/s.

Table 1 Thermal parameters and magnetic properties of Fe83.2-xCoxP10C6Cu0.8 nanocrystalline alloys annealed at 470 °C for 2 min.

Alloys	Thermal parameters			Magnetic properties
Alloys	T_x1 (^oC)	T_x2 (^oC)	ΔT_x (K)	B_s (T)	H_c (A/m)	μ_e (1 kHz)
Fe_83.2P₁₀C₆Cu_0.8	373	485	112	1.71	8.6	9910
Fe_79.2Co₄P₁₀C₆Cu_0.8	373	489	116	1.80	6.6	15,510
Fe_77.2Co₆P₁₀C₆Cu_0.8	376	487	111	1.77	15.3	4800
Fe_75.2Co₈P₁₀C₆Cu_0.8	376	485	109	1.75	19.1	4340
Fe_73.2Co₁₀P₁₀C₆Cu_0.8	380	483	103	1.74	44.9	5030
Fe_83.25P₁₀C₆Cu_0.75 [22]	384	491	107	1.65	3.3	21100
Fe_83.25P₉C₇Cu_0.75 [23]	385	490	105	1.64	3.9	21000

Fig. 3. Annealing temperatures (Ta) dependence of coercivity (Hc) for Fe83.2-xCoxP10C6Cu0.8 (x = 0, 4, 6, 8 and 10) alloy ribbons, and the inset is the dependence of Hc on annealing time (t) for Fe79.2Co4P10C6Cu0.8 alloy annealed at 390 °C.

Fig. 4. Dependence of effective permeability (μe) on Ta for Fe83.2-xCoxP10C6Cu0.8 alloy ribbons.

Fig. 5. Magnetization performance and microstructure evolution of FeCoPCCu alloys during the annealing process.

Fig. 6. Brigh-field TEM images of Fe83.2-xCoxP10C6Cu0.8 alloys with x = 0 (a) AQ ribbons, (b) and (c) corresponding the ribbons annealed at 410 °C and 470 °C for 2 min, respectively; x = 4 (d) AQ ribbons, (e) and (f) corresponding the ribbons annealed at 410 °C and 470 °C for 2 min, respectively. The inset is the corresponding selected area electron diffraction (SAED) patterns and grain size distributions.

Fig. 7. Relationship between average magnetic moment and magnetic valence of AQ Fe83.2-xCoxP10C6Cu0.8 alloys, the inset is the Bethe-Slater curve with the different elements.

Fig. 8. (a) Change of coercivity (Hc) and grain size (D) with annealing temperature (Ta), (b) the variation trend of effective permeability (μe), crystallization volume fraction (Vcry) and saturation magnetization (Bs) dependent on Ta for Fe79.2Co4P10C6Cu0.8 alloy.

Fig. 9. Sketch map of microstructure evolution of the AQ alloys with x = 0 (A) and x = 4 (B) at different Ta.

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