In this study,the influence of Ce-and Ce-La-substitution for Nd in Nd-Fe-B magnets on their magnetic and microstructural changes in the course of the hot-deformation process was investigated to gain insight into further reducing the Nd content in fine-grained Nd-Fe-B hot-deformed magnets.We found that the[001]texture and microstructure of the RE-rich grain boundary phases,which are the factors that de-termine the remanence and coercivity of hot-deformed magnets,were deteriorated by the Ce-and Ce-La-substitution.This is because the volume fraction of the RE-rich liquid formed in the grain boundaries during the hot-press and hot-deformation decreased due to the Ce-and Ce-La-substitution,thereby in-creasing the friction between the 2∶14∶1 grains while the c-axes of grains were aligned by grain rotation and decreasing the RE concentration of grain boundary phases.In particular,the Ce-La-co-substitution further prevented the liquid formation within the grain boundaries of the magnets during hot-press and hot-deformation because the wettability of the RE-rich liquid on the 2∶14∶1 grains became poor when La was substituted for Nd in the 2∶14∶1 grains.These results indicate that there is room for further im-provement in both the remanence and coercivity of the Ce-and Ce-La-substituted magnets by intro-ducing additional liquid into the grain boundaries prior to hot-press and hot-deformation.By applying the Nd-Cu infiltration process to the melt-spun ribbons(intermediate infiltration,I-infiltration),both the remanence and coercivity of the Nd-saving(Ndo.7Ce0.3)-Fe-B and(Nd0o.7Ce0.225La0.075)-Fe-B hot-deformed magnets were successfully improved.

Ga-Yeong Kim;Tae-Hoon Kim;Hee-Ryoung Cha;Sang-hyub Lee;Dong-Hwan Kim;Yang-Do Kim;Jung-Goo Lee

Department of Magnetic Materials,Korea Institute of Materials Science,Changwon 51508,Republic of Korea;Department of Materials Science and Engineering,Pusan National University,Busan 46241,Republic of Korea;R&D Center,Star Group Ind.Co.,Ltd.,Daegu 42714,Republic of Korea

材料科学技术（英文版）

[1]Ga-Yeong Kim;Tae-Hoon Kim;Hee-Ryoung Cha;Sang-hyub Lee;Dong-Hwan Kim;Yang-Do Kim;Jung-Goo Lee-.Texture development and grain boundary phase formation in Ce-and Ce-La-substituted Nd-Fe-B magnets during hot-deformation process)[J].材料科学技术（英文版）,2022(31):71-79

Ndo,7Ce0,Nd0o,225La0

Texture,development,boundary,substituted,magnets,during,hot,deformation,process,In,this,study,influence,substitution,their,magnetic,microstructural,changes,course,was,investigated,gain,insight,into,further,reducing,content,fine,grained,deformed,We,found,that,texture,microstructure,RE,rich,phases,which,are,factors,termine,remanence,coercivity,were,deteriorated,This,because,volume,fraction,liquid,boundaries,press,decreased,due,thereby,friction,between,grains,while,axes,aligned,rotation,decreasing,concentration,particular,prevented,within,wettability,became,poor,when,These,results,indicate,room,provement,both,intro,additional,prior,By,applying,infiltration,melt,spun,ribbons,intermediate,saving,successfully,improved

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