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通过感应熔炼制备了不同V掺杂量的铸态SmFe9-xVx(x=0,0.4,0.8,1.2,1.6,2.0)合金,经过850℃,5 h均匀化退火处理,采用XRD,VSM等方法分析了SmFeV合金的结构和性能,进而研究V掺杂对SmFe合金的结构和性能的影响规律。结果表明:随V掺杂量增加,SmFe合金的相结构发生显著变化,x≦0.4时,SmFeV合金以Th2Zn17型结构存在,x=0.8时,Th2Zn17结构开始转变为ThMn12型结构,但仍有Th2Zn17相存在,当x=1.2时,Th2Zn17相完全消失,转化为ThMn12结构相,随V含量进一步增加,达到x=1.6时,ThMn12结构又开始转变为3∶29型结构,当x=2.0时,ThMn12结构相完全消失,转变为3∶29结构相;V掺杂影响SmFe合金结构变化的同时,对SmFe合金的居里温度也有显著影响:当V掺杂量x=0.4时,Th2Zn17结构相的居里温度大幅度提高,从400 K上升到470 K;随V掺杂量进一步增加,居里温度呈现先升高后下降趋势,在x=1.2时获得最高居里温度,即Tc=590 K,x=2.0时,居里温度下降到最低值,即Tc=480 K;另外,矫顽力随V掺杂量增加也呈现先升高后下降趋势,在x=1.2时获得最高矫顽力,即iHc=207 kA.m-1,同时其剩磁及剩磁比分别为Mr=210 kA.m-1,Mr/M∞=0.5。
The as-cast SmFe9-xVx (x = 0,0.4,0.8,1.2,1.6,2.0) alloys with different V doping amount were prepared by induction melting, and annealed at 850 ℃ for 5 h. XRD, VSM and other methods The structure and properties of SmFeV alloy were analyzed. Then the influence of V doping on the structure and properties of SmFe alloy was studied. The results show that the phase structure of SmFe alloy changes significantly with the increase of V doping amount. When x ≦ 0.4, SmFeV alloy exists as Th2Zn17 type structure. When x = 0.8, Th2Zn17 structure begins to change to ThMn12 type structure, but there is still Th2Zn17 When x = 1.2, the phase of Th2Zn17 completely disappeared and transformed into the structure of ThMn12, which further increased with the increase of V content. When x = 1.6, the structure of ThMn12 began to change to the structure of 3:29. When x = 2.0, ThMn12 phase completely disappears and changes to the 3:29 structure phase. V doping also affects the structure of SmFe alloy and also has a significant effect on the Curie temperature of SmFe alloy. When V doping amount x = 0.4, the structure of Th2Zn17 phase The Curie temperature increased greatly from 400 K to 470 K. With the further increase of V doping, the Curie temperature firstly increased and then decreased and reached the highest Curie temperature at x = 1.2, ie Tc = 590 K , the Curie temperature decreased to the lowest value when x = 2.0, that is, Tc = 480 K. In addition, the coercivity also increased first and then decreased with the increase of V doping, and the highest coercivity was obtained at x = 1.2 , Namely iHc = 207 kA.m-1, at the same time its remanence and remanence ratio are Mr = 210 kA.m-1, Mr / M∞ = 0.5.