摘要
用机械合金化方法制备了 Fe1 0 0 - x Nix 系超细粉末 (其中 x=75 ,45 ,35 ,32 .5 ,30 ) ,对各样品进行了 X- ray衍射谱的分析 .用柯西分布计算了材料的晶粒尺寸约 6～ 15 nm,最大应变ε=6 % ,用最小二乘法计算了材料的晶格常数 ;测量了不同成分样品的磁滞回线 .研究表明 ,当 x=75 ,45时材料呈现单相 Ni型面心立方结构 ;当 30 <x<35 ,样品仍然以 Ni相为主 ,但出现了少量 γ- Fe相和少量 α- Fe相 ;当 x=30时材料呈现了 α- Fe相和 γ- Fe相的复相 ,没有 Ni相出现 .样品的磁滞回线除了 x=30的样品之外均出现超顺磁性的磁滞回线 ,有较低的矫顽力 Hc,低剩磁 Br 且样品有高的饱和磁化强度 Ms,因此样品具有优良软磁材料的内禀性能 .
Fe 100 x Ni x hyperfine alloyed particles ( x =75,45,35,32.5,30) were prepared by mechanical alloying. The studies of X ray diffraction spectra were done for all the samples. The crystallite size and internal strain of compounds were determined by Cauchy distribution function. The values of crystallite size range from 6 nm to 15 nm, and the maximum strain is about 6%. The lattice constants were calculated by least square method. Magnetic hysteresis curves measurements were carried out for different composition. Analysis has shown FCC monophase of Ni in the composition of x =75,45. For 30< x <45, FCC structure of Ni mainly of Ni was accom panied by a small fraction of γ Fe. While x =30, a mixture of γ Fe, (FCC) and α Fe (BCC) appeared with absence of Ni (FCC) phase. Except x =30, all the samples exhibit super paramagnetic feature in hysteresis curves. Its high B s , low H c and low B r indicate superior intrinsic properties of soft magnetic materials. This paper has also discussed the dependence on milling time with magnetic properties for different composition.
出处
《上海大学学报（自然科学版）》
CAS
CSCD
1999年第3期257-261,共5页
Journal of Shanghai University:Natural Science Edition
基金
上海市高等学校科学技术发展基金项目!( 814 5 86)
关键词
机械合金化
磁滞回线
铁镍合金
超细粉末
磁性
mechanical alloying (MA)
magnetic hysteresis curve
super paramagnetic property
