ORCID
http://orcid.org/0000-0002-0384-3404
Date of Award
Spring 5-15-2020
Degree Name
Doctor of Philosophy (PhD)
Degree Type
Dissertation
Abstract
Nucleation—or the formation of some cluster in a medium undergoing a phase transition—is usually the initial step in a phase transition. However, this process is still not fully understood, as outstanding questions related to the role of structure, local order, and diffusion remain unanswered. Systematic supercooling studies on metallic liquids performed using electrostatic and electromagnetic (ESL and EML, respectively) will be presented and discussed within the context of several nucleation theories, such as the Classical Nucleation Theory, Diffuse Interface Theory, and Coupled-Flux theory. To study the role of diffusion on nucleation, studies on the International Space Station using the on-board EML were performed. Initial results suggest that diffusion becomes an important factor for nucleation in quiescent liquids, as predicted by the Coupled-Flux theory. Initial results on several metallic liquids (Ti-Zr-Ni, Zr-Pt, Zr-Pd, Cu-Zr) using groundbased ESL techniques suggest that the local order in the liquid, structure of the nucleating phase, and number of phases formed are important factors to consider to understand nucleation.
Language
English (en)
Chair and Committee
Kenneth F. Kelton
Committee Members
Katharine Flores, Erik Henriksen, Zohar Nussinov, Li Yang,
Recommended Citation
Sellers, Mark Edward, "Studies of Maximum Supercooling and Stirring in Levitated Liquid Metallic Alloys" (2020). Arts & Sciences Electronic Theses and Dissertations. 2242.
https://openscholarship.wustl.edu/art_sci_etds/2242