【摘要】 测量了制备态和经不同温度（ｔａ ＝ ４５０ ～７５０ ℃） 退火的Ｆｅ７３－５Ｃｕ１Ｎｂ３Ｓｉ１３－５Ｂ９ 合金的室温磁后效和正电子寿命·发现在６００ ℃以下退火，随着退火温度升高，磁后效和正电子寿命都单调下降；在６５０ ℃以上退火，磁后效基本被抑制，正电子寿命出现两个值，它们分别对应自由体积和空位聚集体，且后者显着增大·实验结果表明，磁后效主要由材料中的非晶相所贡献，这是由于非晶相中存在大量自由体积的缘故·更多还原

【Abstract】 The magnetic aftereffect and the positron lifetime were measured at room temperature in the Fe 73 5 Cu 1Nb 3Si 13 5 B 9 alloy under as quenched condition and under the conditions annealed at a range of temperatures t a from 450?℃ to 750?℃ respectively. It was found that both the magnetic after effet and the positron lifetime decrease monotonically with increasing t a if t a≤600?℃. When t a≥650?℃,magnetic aftereffect is essentially suppressed and two positron lifetimes apppear. The results show that the magnetic aftereffect is mainly contributed by the amorphous phase in the materials because there are a lot free volume in the amorphous phase.更多还原