期刊
PHILOSOPHICAL MAGAZINE
卷 92, 期 22, 页码 2759-2778出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2012.674646
关键词
anisotropic elasticity; atomic defects; atomistic simulation; defect structures; dislocation interactions
类别
资金
- DOE NEUP [DE-AC07-05ID14517 09-269]
- LANL [74230-001-09]
In this study, we calculate the interaction energy of intrinsic point defects vacancies and interstitials) with screw dislocations in body-centered cubic iron. First (we calculate the dipole tensor of a defect in the bulk crystal using molecular statics. Using a formulation based on linear elasticity theory, we calculate the interaction energy of the defect and the dislocation using both isotropic and anisotropic strain fields. Second, we perform atomistic calculations using molecular statics methods to directly calculate the interaction energy. Results from these two methods are compared. We verify that continuum methods alone are unable to correctly predict the interactions of defects and dislocations near the core. Although anisotropic theory agrees qualitatively with atomistics far from the core, it cannot predict which dumbbell orientations are stable and any continuum calculations must be used with caution. Spontaneous absorption by the core of both vacancies and dumbbells is seen. This paper demonstrates and discusses the differences between continuum and atomistic calculations of interaction energy between a dislocation core and a point defect.
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