纳米晶合金Fe_(73.0) Cu_(1.0) Nb_(1.5) Mo_(2.0) Si_(13.5)B_(9.0)中缺陷的正电子湮没寿命谱研究

A Study of Defects in Nanocrystalline Alloy Fe_(73.0)Cu_(1.0)Nb+(1.5)Mo_(2.0)Si_(13.5)B_(9.0) by Positron Annihilation Lifetime Spetrum

用正电子湮没寿命谱仪测量和分析了Fe73.0Cu1.0Nb1.5Mo2.0Si13.5B9.0纳米晶合金,该合金纳米晶化后有 两类组织结构:一类是非晶结构,另一类是纳米晶结构;从缺陷形式上讲也有两种,一种是类空位,另一 种是含有十来个单空位的空位团。类空位缺陷位于非晶区,空位团位于纳米晶区和晶粒的界面。

The measurements of the lifetime spectra of position annihilation were performed for nanocrystalline alloy Fe73 0Cu1.0Nd1.5Mo2.0Si13 5B9.0. Based on the data of the fitted lifetime spectra it may be suggested that the nano-crystallized Fe73.0Cu1.0Nd1. 5Mo2.0Si13.5B9.0 should consist of two microsructures: amorphous and nanocrystalline. Also, there may be two kinds of microdefects: vacancy - like and vacancy cluster containing several monovacancies. The vacancy - like defects are located at the amorphous zones and the vacancy clusters are located at the nanocrys-tallized zones and the interfaces of crystuline grains.