B掺杂对SmFe_(10)Mo_2合金的结构及磁性的影响  

Effect of B-doping on Microstructure and Magnetic Properties of SmFe_(10)Mo_2 Alloy

作　　者：孙乃坤[1] 杜胜杰 郭杰[1] 

机构地区：[1]沈阳理工大学理学院,沈阳110159

出　　处：《材料研究学报》2015年第1期55-59,共5页Chinese Journal of Materials Research

基　　金：辽宁省自然科学基金2013020105;沈阳市科技计划F13-316-1-39项目资助~~

摘　　要：用电弧熔炼法制备Sm Fe10Mo2及Sm Fe10Mo1.5B0.5母合金锭,将其均匀化退火后用球磨法制备Sm Fe10Mo1.5B0.5纳米晶合金粉末,研究了B掺杂对Sm Fe10Mo2块体合金和球磨对Sm Fe10Mo1.5B0.5纳米粉末的相结构和磁性的影响。结果表明,B掺杂后合金的Th Mn12相结构不变,居里温度由270℃提高到334℃;合金成分不均匀导致热磁曲线出现两个相变点。Sm Fe10Mo1.5B0.5合金经球磨处理0.5 h后Mo大量析出,1∶12相明显减少;随着球磨时间的增加α-Fe析出并形成非磁性的Mo2Fe B2相,使内禀矫顽力明显减小,且其饱和磁化强度随着球磨时间的增加呈现先增大后减小的趋势。球磨0.5 h的纳米合金粉末永磁磁性能最佳:Ms=55Am2/kg,iHc=0.2T。Ingots of Sm Fe10Mo2 and Sm Fe10Mo1.5B0.5alloys were made by arc-melting method and followed by annealing treatment, with which nanocrystalline powders of the alloys were prepared by milling.While the effect of B- doping and ball milling on the phase composition and magnetic properties of the bulk and the nanocrystalline particles of Sm Fe10Mo1.5B0.5alloy was investigated. It has been found that Bdoping did not alter the crystallographic structure of the phase Th Mn12 in the alloy, but remarkably increased its Curie temperature from 270 oC to 334 oC. Due to the inhomogeneity of alloy compositions, correspondingly, in its thermal magnetic curve there exist two abrapt changes related with phase transformation. The post ball milling process could induce the occurrence of precipitates of Mo and α-Fe, which in turn reduce the amount of the Th Mn12 phase and promote the formation an non magnetic phase of Mo2 Fe B2. As a result, with the progress of ball milling process the intrinsic coercive force decreased and the saturation magnetization increased first and then decreased of the Sm Fe10Mo1.5B0.5powders. However, the nanocrystalline particles of Sm Fe10Mo1.5B0.5alloy milled for 0.5h exhibit optimal magnetic properties:iHc=2.2k Oe and Ms=4.3k Gs.

关 键 词：金属材料 球磨处理 相结构 永磁性能 居里温度 

分 类 号：TM273[一般工业技术—材料科学与工程]