TY - JOUR
T1 - Coercivity of the Nd-Fe-B hot-deformed magnets diffusion-processed with low melting temperature glass forming alloys
AU - Seelam, U. M.R.
AU - Liu, Lihua
AU - Akiya, T.
AU - Sepehri-Amin, H.
AU - Ohkubo, T.
AU - Sakuma, N.
AU - Yano, M.
AU - Kato, A.
AU - Hono, K.
N1 - Funding Information:
This work was in part supported by JST , CREST . UMRS thanks ESICMM for post-doctoral fellowship.
Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.
PY - 2016/8/15
Y1 - 2016/8/15
N2 - 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.
AB - 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.
KW - Coercivity
KW - Grain boundary diffusion process
KW - Hot-deformed Nd-Fe-B magnet
KW - Intergranular phase
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U2 - 10.1016/j.jmmm.2016.04.005
DO - 10.1016/j.jmmm.2016.04.005
M3 - Article
AN - SCOPUS:84963537628
VL - 412
SP - 234
EP - 242
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
ER -