(Fe_(1-x)Co_x)_(78．4)Nb_(2．6)Si_9B_9Cu_1纳米晶软磁合金的结构与高频磁性  

MICROSTRUCTURES AND HIGH-FREQUENCY MAGNETIC PROPERTIES OF NANOCRYSTALLINE(Fe_(1-x)Co_x)_(78.4)Nb_(2.6)Si_9B_9Cu_1 SOFT MAGNETIC ALLOYS

作　　者：马晓华[1] 王治[1] 王光建[2] 

机构地区：[1]天津大学理学院,天津300072 [2]河北工程大学物理系,邯郸056038

出　　处：《金属学报》2007年第3期281-285,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50271047;天津市自然科学基金项目003601811资助~~

摘　　要：研究了非晶(Fe_(1-x)Co_x)78．4Nb_2．6Si_9B_9Cu_1(x=0．35,0．5,0．65)合金490℃等温退火0．5 h后的结构与高频磁性．XRD分析表明,退火后非晶合金实现纳米晶化,析出晶粒尺寸约15 nm的α-FeCo(Si)软磁晶体相;随Co含量增加,晶格常数变小．利用Pseudo-Voigt2函数模拟XRD衍射峰并计算了晶体相体积分数,由晶体相体积分数及晶格常数估算了剩余非晶相的成分．用阻抗分析仪测量了合金在10 kHz—10 MHz范围的磁谱曲线．结果表明,随Co含量增加,合金初始磁导率降低,而共振频率明显提高,用畴壁运动方程及畴壁钉扎理论解释了Co含量变化对纳米晶合金高频磁性的影响规律．Microstructures and high-frequency magnetic properties were investigated for amorphous （Fe1-xCox）78.4Nb2.6Si9B9Cu1（x=0.35, 0.5, 0.65） alloys annealed at 490 ℃ for 0.5 h under vacuum atmosphere （1× 10^-3 Pa）. XRD analysis showed that the α-FeCo（Si） crystallites of about 15 nm in diameter precipitated from the amorphous matrix after annealing. With increasing Co content, the lattice parameter of α-FeCo（Si） crystallites decreased. Pseudo-Voigt2 function was used for fitting the XRD patterns in order to estimate the crystalline volume fraction. The mean composition of the residual amorphous matrix was estimated according to crystalline volume fraction and lattice parameter. Permeability-frequency spectra from 10 kHz to 10 MHz of the nanocrystalline alloys showed that with increasing Co content, the initial permeability decreased and resonance frequency remarkably increased. The equation of domain wall motion and the domain wall pinning mechanism were used to analyze the relationship between high-frequency magnetic property of the alloy and Co content.

关 键 词：Fe-Co基合金 纳米晶 磁导率 共振频率 畴壁钉扎 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG113.2[金属学及工艺—金属材料]