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]. 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.

Name thesis:degree_name

Master

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Materials Science and Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2022

Author dc:creator

• Oh, Changhwan

Advisor dc:contributor.advisor

• Freitas, Rodrigo

Statement dc:rights

• In Copyright - Educational Use Permitted
• Copyright MIT

Licence dc:rights.uri

• http://rightsstatements.org/page/InC-EDU/1.0/

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/153079

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/153079