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材料的晶界状态对材料的性能有很大的影响,元素在晶界偏聚对材料性质的影响是冶金和材料科学的重要课题。合金元素和杂质元素在晶界偏聚,使晶界的化学成分发生变化,影响晶界移动、晶粒长大、元素沿晶界扩散、沿晶界的破断等现象,从而影响材料的机械性质、化学性质以及电学性质等。溶解在铁中的铈因原子半径远大于铁而产生较大的点阵畸变能,这将促使它们偏聚在晶界上。我们曾指出,铈和镧能够使硫的偏聚减
The grain boundary state of the material has a great influence on the properties of the material. The influence of the segregation of the elements on the material properties at the grain boundary is an important issue in metallurgy and materials science. Alloying elements and impurity elements in the grain boundary segregation, the grain boundary chemical composition changes, affecting the grain boundary movement, grain growth, grain along the grain boundary diffusion, along the grain boundaries of the broken and so on, thus affecting the mechanical properties of the material , Chemical and electrical properties. Cerium dissolved in iron has a larger lattice distortion energy due to the much larger atomic radius than iron, which will cause them to segregate on the grain boundaries. We have pointed out that cerium and lanthanum can reduce the partial polymerization of sulfur