非晶合金Fe_(78)Si_9B_(13)在脉冲电流作用下的单相晶化

SINGLE PHASE CRYSTALLIZATION IN AMORPHOUS Fe 78 Si 9B 13 ALLOY INDUCED BY ELECTROPULSING

对非晶合金Ｆｅ７８Ｓｉ９Ｂ１３进行了超短脉冲电流处理，实现了晶化时αＦｅ（Ｓｉ）单相结构析出．可以认为，脉冲电流作用时，电子运动与非晶中空位型结构缺陷间的周期性排斥效应促进了类金属原子从非晶结构单元中析出，使Ｆｅ（Ｓｉ）原子局部富集，导致基体金属相在较低温度下优先成核．而在空位的定向迁移的同时，将伴随Ｂ原子的扩散，则Ｂ原子局域富集。

Abstract Amorphous specimens of Fe 78 Si 9B 13 have been treated by ultrashort pulse current. It was obtained that the α Fe(Si) single phase structure precipitated from the amorphous matrix of Fe 78 Si 9B 13 by adjusting the parameters of pulse current. It can be considered that the single phase crystallization results from the periodic repulsion between the moving electrons and the vacancy like structural defects in the amorphous parts.That is,the repulsive effect causes the metalloid atoms B to precipitate from the amorphous structural units and Fe(Si) atoms segregate in some localized region. So the basic metal phase is forced to nucleate at a lower temperature. However the directional migration of vacancy like defects will be accompanied by diffusion of atoms B. Obviously,the segregation of atoms B and the precipitation of Fe B compound will be checked by both factors the mentioned above.