Phase Changes of Zr Added Sm-Fe-V Alloys around the Compound Sm_3(Fe,V)_<29>

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The effect of Zr additions on phase changes in the Sm-Fe-V system, around the compound Sm_3(Fe,V)_<29> was investigated. In Sm_xFe_<94.2-x-y>V_<5.8>Zr_y (x=7.7-8.9, y=0-1.6) alloys homogenized at temperature above 1453K, the hexagonal Th_2Ni_<17>-type (2-17H) phase, which was not observed in the ternary alloys, is present as the main phase. However, in the alloys homogenized at temperatures below 1373K, the 2-17H phase is not observed and the Sm_3(Fe,V)_<29>-type (3-29) and Th_2Zn_<17>-type (2-17R) phases are present, accompanied by a small amount of ThMn_<12>-type (1-12) phase, in which α-(Fe,V) is embedded. In Sm_<8.2>Fe_<84.8>V_<5.8>Zr_<1.2> alloys homogenized at 1473K for 20h, XRD showed that the 2-17H phase transforms into 3-29 and TbCu_7-type (1-7) phases after annealing for 4h up to 1323K, and into 3-29 and 2-17R after annealing at 1423K. TEM observations revealed that these grains consist of a submicron scale, two phase mixture. This is the first report of two phase decomposition in the Sm-Fe-V system, however, the coercivities of the nitrided alloys in which the two phase mixture was observed, were small (37kAm^<-1>).
社団法人日本磁気学会の論文
1999-01-20