Uneven Evolution of Microstructure, Magnetic Properties and Coercivity Mechanism of Mo-Substituted Nd-Ce-Fe-B Alloys

doi:10.1007/s40195-020-01079-z

Abstract

Abstract:

The purpose of this paper is to study the influence of Mo addition on the phase morphologies, microstructures and magnetic properties of the designated alloys. It is found out that the coercivity H_cj increases unevenly from 12.2 kOe for (Nd_0.8Ce_0.2)₁₃Fe₈₂B₅ to the maximum value of 13.3 kOe for (Nd_0.8Ce_0.2)₁₃Fe₈₀B₅Mo₂. The transmission electron microscopy images demonstrate that the grain size decreases with the addition of Mo, which indicates that Mo has grain refinement effect. The correlative analysis gives rise to the conclusion that the coercivity mechanism of the investigated alloys is dominated by pinning type. All in all, the enhancement of the magnetic properties is mainly attributed to the synergistic impact of grain refinement, pinning effects and the microstructural homogenization. The research may shed light on the potential development and application of rare earth-based counterpart magnets.

Key words: Mo-doped Nd-Ce-Fe-B alloy, Magnetic properties, Melt-spun ribbons, Microstructure, Coercivity mechanism

Li-Li Zhang, Jie Song, Sajjad Ur Rehman, Jia-Jie Li, Lei Wang, Mu-Nan Yang, Ren-Hui Liu, Qing-Zheng Jiang, Zhen-Chen Zhong. Uneven Evolution of Microstructure, Magnetic Properties and Coercivity Mechanism of Mo-Substituted Nd-Ce-Fe-B Alloys[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(4): 590-596.

Figures/Tables 8

Fig. 1 XRD patterns for (Nd0.8Ce0.2)13Fe82-xB5Mox (x=0, 1.0, 2.0, 3.0) alloys

Table 1 Lattice parameters of the main phases of (Nd0.8Ce0.2)13Fe82-xB5Mox (x=0, 1.0, 2.0, 3.0) alloys

X (at%)	A (Å)	C (Å)	V (Å³)
0	8.80105	12.18157	943.57
1.0	8.78633	12.18252	940.49
2.0	8.78837	12.17314	940.20
3.0	8.78876	12.20638	942.85

Fig. 2 Demagnetization curves of the (Nd0.8Ce0.2)13Fe82-xB5Mox (x=0, 1.0, 2.0, 3.0) alloys

Fig. 3 Magnetic performance as a function of Mo content for (Nd0.8Ce0.2)13Fe82-xB5Mox (x=0, 1.0, 2.0, 3.0) alloys

Fig. 4 TEM images of (Nd0.8Ce0.2)13Fe82-xB5Mox alloys

Fig. 5 Calculated particle size distribution maps of (Nd0.8Ce0.2)13Fe82-xB5Mox alloys: a x=0, b x=1.0, c x=2.0, d x=3.0

Fig. 6 Virgin curves of (Nd0.8Ce0.2)13Fe82-xB5Mox (x=0, 1.0, 2.0, 3.0) alloys

Fig. 7 Dependence of Jr and Hc on applied fields in the minor loops of (Nd0.8Ce0.2)13Fe82-xB5Mox alloys: a x=0, b x=1.0, c x=2.0, d x=3.0

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