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Author Nazarov, Airat A. ♦ Dmitry ♦ Bachurin, V. ♦ Shenderova, Olga A. ♦ Donald ♦ Brenner, W.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Grain Boundary ♦ Finite Length ♦ Triple Junction Defect Due ♦ Polycrystalline Material ♦ Com-pensating Disclinations ♦ Triple Junction ♦ Non-equilibrium Structure ♦ Elastic Energy ♦ Gb Period ♦ Finite Length Grain Boundary ♦ Strength Value ♦ Discrete Nature ♦ Dislocation Energy ♦ Nanocrystalline Metal ♦ Misorientation Angle ♦ In-finite Boundary ♦ Finite Length Gb ♦ Dislocation Structure ♦ Significant Role ♦ Grain Size ♦ Specific Disclinations ♦ Junction Disclinations ♦ Triple Junction Energy ♦ Gb Triple Junc-tions ♦ Disclination-structural Unit Model ♦ Neighboring Gb ♦ Grain Boundary Dislocation Network ♦ Present Paper ♦ King Calculation ♦ Discrete Value
Abstract Abstract. King [1] established that due to the discrete nature of their dislocation structure, finite length grain boundaries (GBs) in polycrystalline materials possess discrete values of misorientation angle. For a GB with a length that is not a multiple of the GB period, this leads to the formation of specific disclinations at their junctions with neighboring GBs, which compensate the difference between the misorientations of finite and in-finite boundaries. In the present paper the origin of these compensating disclinations within GB triple junc-tions is elucidated and their strength is calculated using the disclination-structural unit model. It is shown that for a GB with length of about 10 nm the junction disclinations can have a strength value not more than 1◦, in contrast to King’s calculations that indicate much larger values. Elastic energies of triple junctions due to com-pensating disclinations are calculated for both equilibrium and non-equilibrium structures of a finite length GB, which differ by the position of the grain boundary dislocation network with respect to the junctions. The calcu-lations show that triple junction energies are comparable to dislocation energies, and that compensating discli-nations can play a significant role in the properties of nanocrystalline metals with grain sizes less than about 10 nm.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article