淬火温度对Fe-6.5wt%Si粉末组织结构与磁性能的影响  

Effect of quenching temperature on microstructure and magnetic properties of Fe-6.5wt%Si alloy powders

作　　者：乐晨[1,2] 蔡一湘 刘辛[1] 王德志[1] 毛新华 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]广东省工业技术研究院粉末冶金研究所,广东广州510650

出　　处：《磁性材料及器件》2014年第5期1-4,61,共5页Journal of Magnetic Materials and Devices

基　　金：科技部科研院所技术开发研究专项资金资助项目(2010EG215058)

摘　　要：采用气雾化法制备了Fe-6.5wt%Si合金粉末,利用扫描电镜、X射线衍射仪和振动样品磁强计等分析检测手段研究了淬火温度对其显微结构及磁性能的影响。结果表明,经400~800℃淬火的Fe-6.5wt%Si粉末中只观察到单一的α-Fe（Si）相,即A2无序相结构。粉末晶格常数随淬火温度的变化可能与有序相转变和亚稳相的析出有关。粉末的矫顽力随淬火温度的升高先增后减再增高,分别在500℃和700℃淬火时达到最大值和最小值,其原因可能分别与DO3和B2有序相的生成有关。粉末的比饱和磁极化强度则随淬火温度的升高先减后增再减小,在600℃淬火时最低,在400℃和700℃时其值较高,这主要归因于合金有序度的变化。气雾化制备的Fe-6.5wt%Si粉末在700℃淬火时的综合磁性能较优。Fe-6.5wt%Si alloy powders were prepared by gas atomization. The microstructure and magnetic properties of Fe-6.5wt%Si alloy powders under different quenching temperature were analyzed by scanning electron microscopy, X-ray diffraction, and vibrating sample magnetometer, respectively. The results show that only single α-Fe（Si） phase was observed in the powders quenched at 400-800℃, namely A2 disordered phase. The variation of lattice parameter with quenching temperature may be related to transition of the ordered phases and precipitation of the metastable phase. With the increase of quenching temperature, the coercive force of the powders decreases after the fwst increase and then increases again, reaching the maximum and minimum for samples quenched at 500℃ and 700℃ respectively, which may be correlated with the growth of DO3 and B2 ordered phases. With the increase of quenching temperature, specific magnetization increases after the first decrease and then decreases, reaching the minimum at 600℃ and becomes higher at 400℃ and 700℃, which can be attributed to order variation of the alloy powders. Compared with the other temperatures, Fe-6.5wt%Si alloy powders prepared by gas atomization quenched at 700℃ has better magnetic properties.

关 键 词：Fe-6.5wt%Si粉末 气雾化 淬火 有序相 磁性能 

分 类 号：TM271.2[一般工业技术—材料科学与工程]