Equilibrium shape of dislocation shear loops in anisotropic alpha-Fe
We present dislocation dynamics (DD) simulations of shear loops in a highly anisotropic linear elastic crystal. The equilibrium shapes of the loops are determined for the four principal slip systems of the body-centered-cubic lattice, using empirical elastic constants for α-Fe, for a range of temper...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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2011
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| _version_ | 1797055708229795840 |
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| author | Aubry, S Fitzgerald, S Dudarev, S Cai, W |
| author_facet | Aubry, S Fitzgerald, S Dudarev, S Cai, W |
| author_sort | Aubry, S |
| collection | OXFORD |
| description | We present dislocation dynamics (DD) simulations of shear loops in a highly anisotropic linear elastic crystal. The equilibrium shapes of the loops are determined for the four principal slip systems of the body-centered-cubic lattice, using empirical elastic constants for α-Fe, for a range of temperatures over which its elastic anisotropy varies considerably. The results are compared with those obtained from the isotropic elasticity approximation, and from an analytical line tension model. Sharp corners, which have been observed in the electron microscope and arise due to the thermodynamic instability of certain dislocation orientations, are reproduced by DD simulations in qualitative agreement with existing analytical calculations. Some differences are observed between the DD and the line tension model predictions. © 2011 IOP Publishing Ltd. |
| first_indexed | 2024-03-06T19:13:39Z |
| format | Journal article |
| id | oxford-uuid:179ea92d-f6f2-4d53-a3f9-0f5e6d9e951b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:13:39Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:179ea92d-f6f2-4d53-a3f9-0f5e6d9e951b2022-03-26T10:38:28ZEquilibrium shape of dislocation shear loops in anisotropic alpha-FeJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:179ea92d-f6f2-4d53-a3f9-0f5e6d9e951bEnglishSymplectic Elements at Oxford2011Aubry, SFitzgerald, SDudarev, SCai, WWe present dislocation dynamics (DD) simulations of shear loops in a highly anisotropic linear elastic crystal. The equilibrium shapes of the loops are determined for the four principal slip systems of the body-centered-cubic lattice, using empirical elastic constants for α-Fe, for a range of temperatures over which its elastic anisotropy varies considerably. The results are compared with those obtained from the isotropic elasticity approximation, and from an analytical line tension model. Sharp corners, which have been observed in the electron microscope and arise due to the thermodynamic instability of certain dislocation orientations, are reproduced by DD simulations in qualitative agreement with existing analytical calculations. Some differences are observed between the DD and the line tension model predictions. © 2011 IOP Publishing Ltd. |
| spellingShingle | Aubry, S Fitzgerald, S Dudarev, S Cai, W Equilibrium shape of dislocation shear loops in anisotropic alpha-Fe |
| title | Equilibrium shape of dislocation shear loops in anisotropic alpha-Fe |
| title_full | Equilibrium shape of dislocation shear loops in anisotropic alpha-Fe |
| title_fullStr | Equilibrium shape of dislocation shear loops in anisotropic alpha-Fe |
| title_full_unstemmed | Equilibrium shape of dislocation shear loops in anisotropic alpha-Fe |
| title_short | Equilibrium shape of dislocation shear loops in anisotropic alpha-Fe |
| title_sort | equilibrium shape of dislocation shear loops in anisotropic alpha fe |
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