Nuclear Engineering ETDs

Publication Date

Fall 12-16-2023

Abstract

Nanolamellar composites with high interface density have increased strength due to interfaces serving as barriers to dislocation movement and high radiation damage resistance. However, these interfaces also serve as barriers to electron motion, reducing the electrical resistivity and thermal conductivity. This work seeks to understand the inherent tradeoff between strength and physical properties of nanolamellar composites produced by accumulative roll bonding with layer thickness ranging from 25 nm to 193 nm. The electrical resistivity was investigated over temperatures ranging from 2 K to 300 K. The effect of longitudinal rolling and cross rolling was also investigated. Electrical resistivity results were then compared with two models for resistivity of thin-films: the Fuchs-Sondheimer and the Mayadas-Shatzkes models. The thermal conductivity of the specimens was evaluated using modulated thermoreflectance. Findings showed that while resistivity increased with decreasing layer height, thermal conductivity was only weakly dependent on layer height but was highly directionally dependent.

Keywords

Composite Materials, Physical Properties, Radiation Resistant Materials, Multilayered materials

Sponsors

Nuclear Science and Security Consortium

Document Type

Thesis

Language

English

Degree Name

Nuclear Engineering

Level of Degree

Masters

Department Name

Nuclear Engineering

First Committee Member (Chair)

Osman Anderoglu

Second Committee Member

Eric Lang

Third Committee Member

Filip Ronning

Fourth Committee Member

Andrew Hoff

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