【摘要】 用高密度脉冲电流处理Ｆｅ７８Ｂ１３Ｓｉ９非晶合金，随电流密度的变化在不同的温度下和相同的时间内实现了试样的纳米晶化．透射电镜观察及Ｘ射线衍射分析表明，在由电脉冲方法所制备的纳米晶Ｆｅ７８Ｂ１３Ｓｉ９合金中存在着亚晶和孪晶等亚结构．三种晶化相是α－Ｆｅ（Ｓｉ），Ｆｅ２Ｂ和少量的Ｆｅ３Ｂ．随着电流密度的增加，试样中的Ｆｅ２Ｂ相略有增加并出现了有序的Ｆｅ３Ｓｉ结构，但平均晶粒尺寸保持不变，由Ｓｈｅｒｒｅｒ方法估算为２０～３０ｎｍ．在电脉冲试样中亚结构的存在和相对不变的晶粒尺寸应归因于电脉冲处理所导致的不同的晶化机制更多还原

【Abstract】 The high current density electropulsing is used to treat the amorphous Fe 78 B 13 Si 9 alloy, and nanocrystallization is achieved at various temperatures (683 K～773 K) and for the same pulsing time (30 min) with the change of the current density. The transmission electron microscopic observation and X ray diffraction analysis show that the substructure, such as sub grain and twin, exists in the nanocrystalline Fe 78 B 13 Si 9 alloy prepared by electropulsing. Three crystalline phases are α Fe(Si), Fe 2B and a small amount of Fe 3B. With increase of the current density, the Fe 2B phase slightly increase in amount, and the ordered Fe 3Si structure appears. However, the average grain size remaines the same, estimated to be 20～30 nm by Sherrer’s method. The existence of substructure and nearly the same grain size in the pulsed samples should be attributed to the different kinds of mechanism induced by elctropulsing.更多还原