4.6 Article

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

Journal

ACTA METALLURGICA SINICA-ENGLISH LETTERS
Volume 34, Issue 4, Pages 590-596

Publisher

CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-020-01079-z

Keywords

Mo-doped Nd-Ce-Fe-B alloy; Magnetic properties; Melt-spun ribbons; Microstructure; Coercivity mechanism

Funding

  1. Jiangxi University of Science and Technology under excellent doctoral thesis cultivation project [3105500035]
  2. Science and Technology Program of Fujian Province [2017T3001]
  3. National Natural Science Foundation of China [51564037]

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This study found that the addition of Mo can enhance the magnetic properties of designated alloys, mainly attributed to the synergistic impact of grain refinement, pinning effects, and microstructural homogenization.
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 coercivityH(cj)increases unevenly from 12.2 kOe for (Nd0.8Ce0.2)(13)Fe(82)B(5)to the maximum value of 13.3 kOe for (Nd0.8Ce0.2)(13)Fe80B5Mo2. 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.

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