Affiliation:
1. Central South University of Forestry and Technology
Abstract
Using the first-principles self-consistent discrete variational method based upon density functional theory, we investigated the energetics and the electronic structure of the 3d impurities Ni and Co in a kink on the [100](010) edge dislocation (ED) in bcc iron. The calculated results show that the interatomic energies between the impurity atom and the neighboring host atoms decrease. The bonding for the impurity atom (Ni, Co) and the neighboring host Fe atoms is weaker than that for an Fe atom at the X site and the corresponding atoms in the clean kink. These results indicate that sideways motion of the kink in the <100>{010} ED is accelerated by an impurity atom such as Ni or Co and that, consequently, the presence of impurities increases the dislocation mobility, thus leading to solid-solution softening.
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Radiation
Reference22 articles.
1. Z. Y. Zha: Design of Alloy Steels (National Defense Industry Press, Beijing, 1999).
2. J. P. Hirth and J. Lothe: Theory of Dislocations (McGraw-Hill, New York, 1968).
3. H. Alexander: Dislocations in Solids (North-Holland, Amsterdam, 1986), Vol. 8, p.115.
4. J. R. Patel and A. R. Chaudhuri, Phys. Rev. Vol. 143 (1966), p.601.
5. E. Pink and R. J. Arsenault, Mater. Sci. Vol. 24 (1979), p.1.
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献