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Engineering  |  FURI

Daniel R Sinclair

Hometown: Phoenix, Arizona, United States | Graduation Date: Spring 2020
Materials science and engineering

X-Ray Tomography Analysis Correlating Pit Growth and Rolling Conditions in a High-Performance Aluminum Alloy

Research Theme: Security
FURI: Spring 2020

Aluminum alloys are commonly used for engineering applications due to their high strength to weight ratio and low cost; however, saltwater environments can shorten parts’ longevity by causing pitting corrosion. To advance the analysis of pit growth in the AA7075, this study leveraged x-ray microtomography to observe pit growth in 4D. Previous projects have correlated the growth of pits with the structure of intermetallic inclusions near the surface, and 3D models of pitted regions were produced here, with the goal of combining the resulting images with quantitative data to develop a new model for localized corrosion in AA7075.

Other Projects

X-Ray Tomography Analysis Correlating Pit Growth and Rolling Conditions in a High-Performance Aluminum Alloy

Research Theme: Security
FURI: Fall 2019

Aluminum alloys are commonly used for engineering applications due to their high strength to weight ratio and low cost. However, saltwater environments shorten parts’ longevity by causing pitting corrosion. X-ray microtomography is leveraged to non-destructively observe pit growth in three dimensions over a 20-day corrosion period. Previous work in the group has correlated the growth of pits over time with the structure of contaminant inclusions near the surface. The extent of cold rolling and specimen orientation relative to the rolling direction are varied, and the number and depth of pits over 20 days is quantified to determine the effects of resultant inclusion structures.

X-Ray Tomography Analysis of Pit Growth in a High-Performance Aluminum Alloy

Research Theme: Security
FURI: Spring 2019

Aluminum alloys are commonly selected for engineering applications due to their high strength to weight ratio and low cost, however saline solutions shorten parts’ longevity by causing pitting corrosion. Many 2D characterization methods cannot fully analyze the growth of these pits over time; as such, this study seeks to leverage x-ray microtomography to observe pit growth in three dimensions over a 20-day corrosion period. By measuring a representative number of pits in a high performance aluminum alloy, it was possible to quantify the growth rates of pits and the native oxide layer. This information was used to determine and describe the effects of inclusions and oxide growth on pits.

Silicon Nanoparticle Layers for Use as Glass Insulation

Research Theme: Security
GCSP: Spring 2018

This project seeks to develop layers of silicon nano-particles for deposition onto glass to produce thermal insulation for residential and commercial buildings. Porous silicon nano-particles have been shown to refract ultraviolet wavelengths of sunlight at their front face and interface with glass. Currently, these layers lack durability, and spectrophotometry analysis shows excessive haze, issues which will be reduced by tuning nano-particle size. As nano-particle insulation can be applied to single-pane glass, it is a cheaper alternative to renovating houses to include double-pane windows and frames. This technology has commercial potential, but further work could expedite the deposition process.

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