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直接在晶粒表面上通过晶界析出行为和析出相的成分特征等研究了微量元素对晶界的作用。提出溶质原子的原子错配度概念,解释了微量元素的晶界偏聚效应和相互作用机制。阐述了微量元素促使晶界相球化和退化的机理。用原子错配度概念,综述了所研究高温合金中错配度大的微量元素原子可阻碍错配度小的溶质原子向晶界偏聚,并倾向于将后者从晶界点阵(或间隙)驱逐到晶内点阵(或间隙)或晶界相中,同时研究了后者对前者的反作用。
The effects of trace elements on the grain boundaries were studied directly on the grain surface by the grain boundary precipitation behavior and the compositional characteristics of the precipitated phases. The concept of atomic mismatch of solute atoms is proposed, and the segregation effect and interaction mechanism of trace elements in grain boundaries are explained. The mechanism of the microelement to promote the spheroidization and degeneration of the grain boundaries is described. With the concept of atomic mismatch, it is reviewed that the trace elements with large mismatch degree in the superalloy studied can prevent the misorientation of solute atoms from segregating to the grain boundaries, and tend to shift the latter from the grain boundary lattice (or Gap) into the lattice lattice (or gap) or grain boundary phase, while studying the latter reaction to the former.