Date of Award
2022
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Mechanical Engineering
First Advisor
Frederic Sansoz
Second Advisor
Laura Webb
Abstract
Solute segregation in grain boundaries (GBs) is used in design to stabilize nanocrystalline alloys. While analyzing GB segregation energy as a spectrum allows for a more in-depth analysis of the effects of GB atomic structure on solute segregation, this method inherently ignores solute-solute interaction by nature of considering one solute at a time. Here we develop an efficient molecular statics (MS) algorithm for determining the local effect of solute-solute interaction on GB segregation. We apply this algorithm to a Σ9 (221) symmetric tilt grain boundary in a bicrystal as well as a randomly oriented polycrystal for Ni and Cu solutes in Ag. The findings suggest that small changes in average segregation energy between one and two solutes correlate directly to the effect of a fixed solute on its local environment through solute-solute interactions. This work shows that this methodology succeeds to accelerate the study of complex segregation behavior such as heterogeneous and homogeneous tendencies.
Language
en
Number of Pages
54 p.
Recommended Citation
Nenninger, Tara, "Atomic-scale Analysis of Solute Segregation Energy into Grain Boundaries and Polycrystals" (2022). Graduate College Dissertations and Theses. 1507.
https://scholarworks.uvm.edu/graddis/1507