Statistical mechanics of kinks on a gliding screw dislocation
The ability of a body-centered-cubic metal to deform plastically is limited by the thermally activated glide motion of screw dislocations, which are line defects with a mobility exhibiting complex dependence on temperature, stress, and dislocation segment length. We derive an analytical expression f...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-11-01
|
| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.043254 |
| _version_ | 1827285929654484992 |
|---|---|
| author | Max Boleininger Martin Gallauer Sergei L. Dudarev Thomas D. Swinburne Daniel R. Mason Danny Perez |
| author_facet | Max Boleininger Martin Gallauer Sergei L. Dudarev Thomas D. Swinburne Daniel R. Mason Danny Perez |
| author_sort | Max Boleininger |
| collection | DOAJ |
| description | The ability of a body-centered-cubic metal to deform plastically is limited by the thermally activated glide motion of screw dislocations, which are line defects with a mobility exhibiting complex dependence on temperature, stress, and dislocation segment length. We derive an analytical expression for the velocity of dislocation glide, based on a statistical mechanics argument, and identify an apparent phase transition marked by a crossover temperature above which the activation energy for glide effectively halves, changing from the formation energy of a double kink to that of a single kink. The analysis is in quantitative agreement with direct kinetic Monte Carlo simulations. |
| first_indexed | 2024-04-24T10:22:57Z |
| format | Article |
| id | doaj.art-86efc673d8584c6fad23788497b8c24e |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:22:57Z |
| publishDate | 2020-11-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-86efc673d8584c6fad23788497b8c24e2024-04-12T17:04:06ZengAmerican Physical SocietyPhysical Review Research2643-15642020-11-012404325410.1103/PhysRevResearch.2.043254Statistical mechanics of kinks on a gliding screw dislocationMax BoleiningerMartin GallauerSergei L. DudarevThomas D. SwinburneDaniel R. MasonDanny PerezThe ability of a body-centered-cubic metal to deform plastically is limited by the thermally activated glide motion of screw dislocations, which are line defects with a mobility exhibiting complex dependence on temperature, stress, and dislocation segment length. We derive an analytical expression for the velocity of dislocation glide, based on a statistical mechanics argument, and identify an apparent phase transition marked by a crossover temperature above which the activation energy for glide effectively halves, changing from the formation energy of a double kink to that of a single kink. The analysis is in quantitative agreement with direct kinetic Monte Carlo simulations.http://doi.org/10.1103/PhysRevResearch.2.043254 |
| spellingShingle | Max Boleininger Martin Gallauer Sergei L. Dudarev Thomas D. Swinburne Daniel R. Mason Danny Perez Statistical mechanics of kinks on a gliding screw dislocation Physical Review Research |
| title | Statistical mechanics of kinks on a gliding screw dislocation |
| title_full | Statistical mechanics of kinks on a gliding screw dislocation |
| title_fullStr | Statistical mechanics of kinks on a gliding screw dislocation |
| title_full_unstemmed | Statistical mechanics of kinks on a gliding screw dislocation |
| title_short | Statistical mechanics of kinks on a gliding screw dislocation |
| title_sort | statistical mechanics of kinks on a gliding screw dislocation |
| url | http://doi.org/10.1103/PhysRevResearch.2.043254 |
| work_keys_str_mv | AT maxboleininger statisticalmechanicsofkinksonaglidingscrewdislocation AT martingallauer statisticalmechanicsofkinksonaglidingscrewdislocation AT sergeildudarev statisticalmechanicsofkinksonaglidingscrewdislocation AT thomasdswinburne statisticalmechanicsofkinksonaglidingscrewdislocation AT danielrmason statisticalmechanicsofkinksonaglidingscrewdislocation AT dannyperez statisticalmechanicsofkinksonaglidingscrewdislocation |