Coercivity of the Nd-Fe-B hot-deformed magnets diffusion-processed with low melting temperature glass forming alloys

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:412

Article

Seelam, U. M. R.¹  Liu, Lihua^1,2  Akiya, T.¹  Sepehri-Amin, H.¹  Ohkubo, T.¹  Sakuma, N.³  Yano, M.³  Kato, A.³  Hono, K.^1,2 

[1] Natl Inst Mat Sci, ESICMM, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

[2] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan

[3] Toyota Motor Co Ltd, Adv Mat Engn Div, Susono 4101193, Japan

关键词: Hot-deformed Nd-Fe-B magnet;    Grain boundary diffusion process;    Intergranular phase;    Coercivity;   

DOI  :  10.1016/j.jmmm.2016.04.005

来源: Elsevier

【 摘 要 】

Nd- and Pr-based alloys with bulk glass forming ability and low melting temperatures, Nd60Al10Ni10Cu20 and Pr60Al10Ni10Cu20, were used for grain boundary diffusion process to enhance the coercivity of hot deformed magnets. The coercivity increment was proportional to the weight gain after the diffusion process. For the sample with 64% weight gain, the coercivity increased up to 2.8 T, which is the highest value for bulk Nd-Fe-B magnets that do not contain heavy rare-earth elements, Dy or Tb. Approximately half of the intergranular regions were amorphous and the remaining regions were crystalline. Magnetic isolation of the Nd2Fe14B grains by the Nd-rich amorphous/crystalline intergranular phases is attributed to the large coercivity enhancement. The coercivity does not change after the crystallization of the intergranular phase, indicating that the coercivity is not influenced by the strain at the interface with the crystalline intergranular phase. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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