Medouni I, Portavoce A, Maugis P, Eyméoud P, Yescas M, Hoummada K
IM2NP, Faculté des Sciences de Saint-Jérôme case 142, Aix-Marseille University/CNRS, 13397, Marseille, France.
FRAMATOME, Développement (DTID) Et Ingénierie Mécanique (DTIM), 92084, Paris La Défense Cedex, France.
Sci Rep. 2021 Jan 19;11(1):1780. doi: 10.1038/s41598-020-80140-4.
Dislocation engineering in crystalline materials is essential when designing materials for a large range of applications. Segregation of additional elements at dislocations is frequently used to modify the influence of dislocations on material properties. Thus, the influence of the dislocation elastic field on impurity segregation is of major interest, as its understanding should lead to engineering solutions that improve the material properties. We report the experimental study of the elastic field influence on atomic segregation in the core and in the area surrounding edge dislocations in Fe-based alloys. Each element is found either to segregate in the edge dislocation core or to form atmospheres. The elastic field has a strong effect on the segregation atmosphere, but no effect on the dislocation core segregation. The theory is in good agreement with experiments, and should support dislocation engineering.
在为众多应用设计材料时，晶体材料中的位错工程至关重要。在位错处偏析额外的元素常用于改变位错对材料性能的影响。因此，位错弹性场对杂质偏析的影响备受关注，因为理解这一点有望带来改善材料性能的工程解决方案。我们报告了关于弹性场对铁基合金中刃型位错核心及周边区域原子偏析影响的实验研究。发现每种元素要么在刃型位错核心处偏析，要么形成气团。弹性场对偏析气团有强烈影响，但对核心处的位错偏析没有影响。该理论与实验结果吻合良好，应为位错工程提供支持。
