Investigating Dislocation Behavior in High Entropy Alloys Using Atomistic Simulations
Name
oh-ohch-ms-dmse-2022-thesis.pdf
Description
Thesis PDF
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34.15 MB
Format
Adobe PDF
Checksum (MD5)
88f5e40e48106be56e345e7257ab5968
Author(s)
Oh, Changhwan
Advisor(s)
Freitas, Rodrigo
Date Issued
May 2022
Publisher
Massachusetts Institute of Technology
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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