固体中一种新发现的扩散机制──复合体扩散机制

A NEWLY DISCOVERED DIFFUSION MECHANISM IN SOLIDS──COMPLEX DIFFUSION MECHANISM

置换溶质原产可以以溶质原子－空位复合体形式扩散，这一扩散机制可以圆满的说明非平衡偏聚现象发生的规律，密排晶体中溶质原子的异常快速扩散现象，Ｂ在γ－Ｆｅ中快速扩散和晶界非平衡偏聚，溶质原子在Ａｌ表面空位坑中的聚集以及Ｓｉ在Ａｌ晶界处析出等问题．

Substitutional solute atoms are believed to difuse by means of solute atom-vacancy complexes.This mechanism could be used to explain some phenomena very well such as:the rule for occurring of non-equilibrium segregation,the anomalously fast diffusion phenomena of solute atoms,the boron's fast diffusion and non-equilibrium segregation of grain-boundary in γ-Fe,the segregation of solute atoms in vacancy-pits on aluminium surface and the precipitation of silicon in the grain-boundary of aluminium.