Investigating Dislocation Behavior in High Entropy Alloys Using Atomistic Simulations
High-entropy alloy (HEA) is a new alloying strategies involving multi-principal elements in near equiatomic proportions.[39, 11, 37, 19, 41, 13] To fully understand and tune the mechanical properties and crystal plasticity of the alloys, it is necessary to investigate the dislocation behavior[15]. T...
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| Format: | Thesis |
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Massachusetts Institute of Technology
2023
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| Online Access: | https://hdl.handle.net/1721.1/153079 |
| _version_ | 1811071133296885760 |
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| author | Oh, Changhwan |
| author2 | Freitas, Rodrigo |
| author_facet | Freitas, Rodrigo Oh, Changhwan |
| author_sort | Oh, Changhwan |
| collection | MIT |
| description | High-entropy alloy (HEA) is a new alloying strategies involving multi-principal elements in near equiatomic proportions.[39, 11, 37, 19, 41, 13] To fully understand and tune the mechanical properties and crystal plasticity of the alloys, it is necessary to investigate the dislocation behavior[15]. The NiCoCr system is reported to have a single-phase face-centered cubic (FCC) crystal structure with enhanced mechanical properties compared to conventional alloys. Its negative stacking fault energy and high yield strength allows unique dislocation behavior. Also, the annealing temperature of NiCoCr system leads to a wide range of short range orders which directly affect the energy barrier of dislocation movement.[22] This work investigates the flow stresses in various systems under constant strain rate and the relationship between partial dislocation behavior and stacking fault energy of NiCoCr system. |
| first_indexed | 2024-09-23T08:46:33Z |
| format | Thesis |
| id | mit-1721.1/153079 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T08:46:33Z |
| publishDate | 2023 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/1530792023-12-01T03:52:10Z Investigating Dislocation Behavior in High Entropy Alloys Using Atomistic Simulations Oh, Changhwan Freitas, Rodrigo Massachusetts Institute of Technology. Department of Materials Science and Engineering High-entropy alloy (HEA) is a new alloying strategies involving multi-principal elements in near equiatomic proportions.[39, 11, 37, 19, 41, 13] To fully understand and tune the mechanical properties and crystal plasticity of the alloys, it is necessary to investigate the dislocation behavior[15]. The NiCoCr system is reported to have a single-phase face-centered cubic (FCC) crystal structure with enhanced mechanical properties compared to conventional alloys. Its negative stacking fault energy and high yield strength allows unique dislocation behavior. Also, the annealing temperature of NiCoCr system leads to a wide range of short range orders which directly affect the energy barrier of dislocation movement.[22] This work investigates the flow stresses in various systems under constant strain rate and the relationship between partial dislocation behavior and stacking fault energy of NiCoCr system. S.M. 2023-11-30T21:12:16Z 2023-11-30T21:12:16Z 2022-05 2023-11-22T20:58:17.655Z Thesis https://hdl.handle.net/1721.1/153079 In Copyright - Educational Use Permitted Copyright MIT http://rightsstatements.org/page/InC-EDU/1.0/ application/pdf Massachusetts Institute of Technology |
| spellingShingle | Oh, Changhwan Investigating Dislocation Behavior in High Entropy Alloys Using Atomistic Simulations |
| title | Investigating Dislocation Behavior in High Entropy Alloys Using Atomistic Simulations |
| title_full | Investigating Dislocation Behavior in High Entropy Alloys Using Atomistic Simulations |
| title_fullStr | Investigating Dislocation Behavior in High Entropy Alloys Using Atomistic Simulations |
| title_full_unstemmed | Investigating Dislocation Behavior in High Entropy Alloys Using Atomistic Simulations |
| title_short | Investigating Dislocation Behavior in High Entropy Alloys Using Atomistic Simulations |
| title_sort | investigating dislocation behavior in high entropy alloys using atomistic simulations |
| url | https://hdl.handle.net/1721.1/153079 |
| work_keys_str_mv | AT ohchanghwan investigatingdislocationbehaviorinhighentropyalloysusingatomisticsimulations |