FeSiAlCr片状合金微粉超精细结构对材料饱和磁化强度的影响  

Influence of hyperfine structure on saturation magnetization of Fe-Si-Al-Cr flake-shaped particles

作　　者：王东晔 罗庆波 李维佳[2] 高川云 WANG Dongye;LUO Qingbo;LI Weijia;GAO Chuanyun(Chengdu Aircraft Industrial(Group)Co.,Ltd.,Chengdu 610091,China;School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China)

机构地区：[1]成都飞机工业(集团)有限责任公司,四川成都610091 [2]电子科技大学电子科学与工程学院,四川成都610054

出　　处：《电子元件与材料》2020年第4期17-22,共6页Electronic Components And Materials

摘　　要：为了研究FeSiAlCr片状合金微粉的超精细结构和材料饱和磁化强度的影响关系,本文对合金微粉进行了不同温度的退火处理,并对合金微粉进行XRD、穆斯堡尔谱测试。研究发现通过球磨法获得的片状合金微粉的晶体结构为A2结构(即α-Fe结构),经过高于500℃的氮气保护退火后转变为A2结构和D03超晶格结构。穆斯堡尔谱测试结果显示,使用湿法球磨方法得到的原始合金微粉具有连续分布的超精细磁场,经过高于500℃退火的合金微粉具有分立的超精细磁场,可以使用四种原子占位来进行拟合,显示出更高的有序度。同时,合金微粉的饱和磁化强度和平均超精细磁场有接近线性的关系,均随着退火温度的升高有明显提升。研究中还发现,在退火温度为600℃时,存在超精细磁场和饱和磁化强度的拐点,分析是由于在该温度点退火过程中产生了非磁性的B2相。In order to explore the relationship between the microstructure and the saturation magnetization(Ms)of Fe-Si-Al-Cr,the Fe-Si-Al-Cr particles were annealed at different temperature and tested by XRD&Mossbauer spectroscopy.The results show that the flake-shaped particles prepared with the ball-milling method are of A2 structure(a-Fe matrix phase),and transformed to A2 structure and D03 ordered phase by annealing above 500℃.Mossbauer spectroscopy measurements show that the hyperfine magnetic field(HMF)of the original particles prepared with the ball-milling method has wide distribution.On the contrary,the HMF of the powders annealed above 500℃can be easily distinguishable with each other,which can be fitted with 4 atom occupations,demonstrating higher ordering.Besides,the Ms and the average HMF are linearly related and both of them rise obviously with increasing annealing temperature.The research also shows HMF and Ms have an obvious turning point when the powder was annealed at 600℃,which results from a B2 phase generated in the anneal process.

关 键 词：FeSiAlCr合金微粉 饱和磁化强度 微观结构 穆斯堡尔谱 退火 

分 类 号：O441[理学—电磁学] TB34[理学—物理]