Effects of pre-aging on defects evolution and magnetic properties of Sm-Co-Fe-Cu-Zr magnets  

作　　者：Munzali Musa Xin Song Yao Liu Fang Wang Jiuping Fan Tianyu Ma Xiaobing Ren 

机构地区：[1]Frontier Institute of Science and Technology,State Key Laboratory for Mechanical Behavior of Materials,MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter,Xi'an Jiaotong University,Xi'an 710049,China [2]Nigeria Police Academy,Faculty of Science,Department of Physics,P.O.Box 14830,Kano State,Nigeria [3]Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education,Shanxi Normal University,Linfen 041004,China [4]National Institute for Materials Science,Tsukuba,Ibaraki,305-0047,Japan

出　　处：《Journal of Rare Earths》2022年第12期1878-1884,I0003,共8页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(52071256,51901170);the fund of Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education,China(MMMM-202003)。

摘　　要：The heterogeneous precipitation in the 2:17-type Sm-Co-Fe-Cu-Zr permanent magnets has been found to contain complex formation and dissociation of defects.Though low-temperature pre-aging has been utilized to promote the precipitate nucleation by the enlarged chemical driving force,how the defects evolve after pre-aging and how the possibly changed defects state affects the subsequent precipitation behavior remain unclear.In this work,a model magnet Sm25Co47.9Fe18.5Cu5.6Zr3.0(wt%)was selected to study.Through comparison with the as-solution-treated state,it is found that pre-aging for 2 h at 550℃reduces the defects density,which was characterized by less cell boundaries(i.e.,larger cell size)and less basal stacking faults inside the cells(i.e.,higher 2:17 R ordering degree).Further studies reveal that after aging for the same time(10 h)at the same temperature(830℃),the reduced density of defects by preaging also leads to slower precipitation/phase transformation kinetics when co mpared with the non-preaged one,which was characterized by the lower 2:17 R ordering degree and smaller coercivity for the former.These findings suggest that pre-aging has a strong influence on the density of defects and their evolution during subsequent isothermal aging process,which should be carefully considered to tailor the microstructure and magnetic properties of Sm-Co-Fe-Cu-Zr magnets.

关 键 词：Rare earths Sm-Co magnet Magnetic properties PRECIPITATES DEFECTS 

分 类 号：TG132[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—合金]