快淬NdFe_(11)TiC_x合金退火过程中磁有序结构的转变

STRUCTURE TRANSITION OF RAPIDLY QUENCHED NdFe_(11)TiC_x ALLOYS AT DIFFERENT ANNEALING TEMPERATURE

采用交流初始磁化率仪测量和 X射线衍射分析方法 ,研究了 Nd Fe1 1 Ti Cx(x=0 .2 ,0 .4,0 .6 ,0 .8)合金的磁有序结构的转变 .发现铸态样品快淬后 ,随着退火温度从 6 6 0℃升高到96 0℃ ,Nd Fe1 1 Ti C0 .2 合金由 1∶ 7型结构相逐步转变为 1∶ 12型结构相 ;Nd Fe1 1 Ti C0 .4合金由 1∶ 7型结构相逐步转变为高温 1∶ 12型结构相和 2∶ 17型结构相之间的过渡结构 ;C含量 x≤ 0 .4时 ,合金的居里温度随退火温度连续变化 ,合金中磁有序相的结构转变也是连续的 .Nd Fe1 1 Ti C0 .6 合金仅形成 2∶ 17型结构相 ;Nd Fe1 1 Ti C0 .

Structures of NdFe 11 TiC x(x=0,0.2,0.4,0.6,0.8) alloys at different annealing temperatures were studied in detail by X-ray diffraction analysis and a.c.initial susceptibility measurement.The results showed that,for the as-cast specimen annealed at 660℃,760℃,860℃ and 960℃,both NdFe 11 TiC 0.4 and NdFRe 11 TiC 0.4 alloys changed into a ThMn 12 -type phase and a transition phase between TbCu 7 - and ThMn 12 -type structures, respectively,from TbCu 7-type phase; NdFe 11 TiC 0.6 alloy formed a TbCu 7-type phase and no ordered structure occurred in NdFe 11 TiC 0.8 .