Co_(66)Fe_4Mo_2Si_(16)非晶合金在等温退火和等时退火过程中起始磁导率μi随退火时间的延长而增大，在t=45min时达到最大值，然后随着退火时间的延长从快速下降，电子衍射图表明合金此时仍保持非晶结构；合金的饱和磁致伸缩系数λs随退火时间的延长由负值逐渐变为正值，当t=45min时，λs≈0，合金在等温退火过程中起始磁导率的峰值主要来源于零磁致伸缩系数．当等时退火温度为480℃时，合金中开始有少量α－Fe固溶体析出，其磁性能变差．随着退火温度的升高桥出相的体积分数增加，其磁性能急剧下降．
Amorphous ribbons with the composition of Co66Fe4Mo2Sil6 have been isothermally annealed and isochronally annealed. During the isothermal annealing at 460 ℃, the initial permeability μi of the sample annealed for 45 min exhibited a maximum of 11.3 × 104 and the electron diffraction pattern revealed that the sample was still in the amorphous state. But it was observed that the magnetostriction λs varied from negative to positive value and ran through zero at about 45 min. So, it can be understood that the maximum of μi re-sulted from zero λs. In the process of isochronal annealing, a little α-Fe solid solution began to be produced in the sample annealed at 48O ℃. It was clear that the formation of a little amount of α-Fe phase resulted in a dramatic decrease in the magnetic properties.
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