(Fe,Cu,Nb)_(77.5)Si_xB_(22.5-x)纳米晶合金的结构和磁性研究

MICROSTRUCTURE AND MAGNETIC PROPERTIES OF NANOCRYSTALLINE(Fe,Cu,Nb)_(77.5)Si_xB_(22.5-x) ALLOYS

研究了Ｆｅ_（７４．５）Ｃｕ_１Ｎｂ_２Ｓｉ_ｘＢ_（２２．５－ｘ）纳米晶合金中Ｓｉ（Ｂ）含量的变化（ｘ＝９．５－１７．５）对其结构和磁性的影响．结果表明，随着ｘ的增高，合金的Ｃｕｒｉｅ温度及点阵常数皆呈线性下降．由此推定α－Ｆｅ（Ｓｉ）纳米晶粒中的Ｓｉ含量ｘ_α随ｘ增高而线性升高，并符合下列关系ｘα＝０．６２６ｘ＋１０．５实验结果说明，非晶态合金的λｓ值随ｘ的增加而上升，但晶化后合金的λｓ值随ｘ的增加而降低．在一定温度退火后的合金中，纳米晶的体积百分数Ｖｘ随ｘ的增大而增加．

Curie temperature and lattice constants of the nanocrystalline(Fe,Cu.Nb)_(77.5)Si_xB_(22.5-x)(x=9.5-17.5) alloys were found to decrease linearly with the increase of their total Si contenty x While the Si content in crystallized grains,x_α,increases linearly with increasing x.With the increase x,the magnetostriction of the alloys increases in amorphous state,but decreases after crystallization.The volume fraction of the nanocrystalline grains occurred in alloys may increase with the increase of x after annealing under certain temperature.