Correlation of microstructure and magnetic properties in Sm(Co_(bal)Fe_(0.1)Cu_(0.1)Zr_(0.033))_(6.93) magnets solution-treated at different temperatures

查看全文 作　　者：Cheng [1]Xu;Hui [1]Wang;Tian-Li [1]Zhang;Alexander [2]Popov;Raghavan [3]Gopalan;Cheng-Bao [1]Jiang

机构地区：[1]School of Materials Science and Engineering, Beihang University;[2]M.N. Miheev Institute of Metal Physics, Ural Branch of Russian Academy of Sciences;[3]International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI),IITM Research Park

出　　处：《Rare Metals》索引2019年第38卷第1期,共9页

基　　金：financially supported by the National Natural Science Foundation of China(No. 51471016);the Natural Science Foundation of Beijing(No. 2151002);the BRICS STI Framework Program (Nos. 51761145026 and 17-52-80072);Department of Science and Technology,Govt of India, for supporting the work under DSTBRICS proposal reg.No 258 摘　　要：The correlation of microstructure and magnetic properties in Sm(Co_(bal)Fe_(0.1)Cu_(0.1)Zr_(0.033))_(6.93) magnets solution-treated at different temperatures was systematically investigated. It is found that the magnets solution-treated at 1219℃ possess a single 1:7 H phase, exhibiting the homogeneous cellular structure during further aging treatment, leading to the optimum magnetic properties. However, for the magnets solution-treated at 1211 and 1223℃,2:17 H or 1:5 H secondary phase will also form besides 1:7 H main phase, which cannot transform into cellular structure,thus deteriorating the magnetic properties greatly. The irreversible magnetization investigations with recoil loops also propose a non-uniform pinning in the magnets induced by the secondary precipitates. At proper solution temperature, Zr is supposed to occupy the Fe-Fe dumbbell sites in the form of Zr-vacancy pairs, leading to the minimum c/a ratio and thus stabilizing the 1:7 H phase. Finally,Sm(Co_(bal)Fe_(0.1)Cu_(0.1)Zr_(0.033))_(6.93) magnets with the maximum energy product and intrinsic coercivity at 550℃ up to 60.73 kJ·m^(-3) and 553.88 kA·m^(-1) were prepared by powder metallurgy method. 关键词：SM2CO17 SOLUTION treatment Phase CONSTITUTION DEMAGNETIZATION curve SQUARENESS

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Correlation of microstructure and magnetic properties in Sm(Co_(bal)Fe_(0.1)Cu_(0.1)Zr_(0.033))_(6.93) magnets solution-treated at different temperatures

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