Cellular microstructure modification and high temperature performance enhancement for Sm2Co17-based magnets with different Zr contents  

作　　者：Chao Wang Peng Shen Yikun Fang Shuai Wang Qiangfeng Li Lei Wang Wei Li Minggang Zhu 

机构地区：[1]Division of Functional Materials Research,Central Iron and Steel Research Institute,Beijing 100081,China

出　　处：《Journal of Materials Science & Technology》2022年第25期8-14,共7页材料科学技术（英文版）

基　　金：partially supported by the National Natural Science Foundation of China (No. 51871063);the Key Technology Research and Development Program of Shandong (No. 2019JZZY020210)。

摘　　要：Influence of Zr contents on high-temperature magnetic performance of Sm(CoFeCuZr)(x=0.025,0.03,0.035,0.04) magnets were investigated.As x increases from 0.025 to 0.04,the temperature coefficient of intrinsic coercivity(H) is optimized from-0.1673% K^(-1)to-0.1382% K^(-1)and the Hat 773 K gradually increases from 556.32 kA m^(-1)to 667 kA m^(-1).The microstructure and microchemistry of different Zr-content magnets were revealed by a transmission electron microscope equipped with EDS.The increasing Zr content induces that the average size of cells decreases from ~76 nm to ~56 nm and the weight fraction of 1:5 H cell boundary phase increases from ~25% to ~37% as well,resulting decreasing of the average Cu content at cell boundaries from 13.59 at% to ~8.52 at%.It is found that the Cu-lean characteristic at cell boundary phase is the reason that gives rise to higher magnetic properties at elevated temperatures for x=0.04 magnet.

关 键 词：Sm2Co17-type magnets Zr content High temperature magnetic properties FROC diagram 

分 类 号：TM273[一般工业技术—材料科学与工程]