• Hyperbaric growth of carbon fibers by laser chemical vapor deposition 

  Rife, Justin Lee (University of Alabama Libraries, 2019)

  Laser Chemical Vapor Deposition (LCVD) is a promising new processing technique by which freestanding structures, such as fibers, can be deposited. The deposition of carbon fibers by use of ethylene as a precursor gas can ...
• Experimental and numerical study of the reduction of silica in a thermal plasma reactor 

  Li, Yudong (University of Alabama Libraries, 2019)

  High purity silicon production is impeding the expansion of solar energy industry due to high cost. Using high purity SiO2 and carbon, it is possible to economically produce solar grade silicon through two-step process ...
• Advanced characterization of the oxidation behavior of grain refined NiAl 

  White, Rachel Ellen (University of Alabama Libraries, 2019)

  Reactive element doped β-NiAl is one of the most oxidation resistant materials available for high temperature use. It has been extensively studied to create the most adherent, slow growing, and passive layer possible. One ...
• Processing-microstructure-property relations in high pressure cold spray of AA2024 and AA7075 

  Story, William Andrew (University of Alabama Libraries, 2018)

  In this dissertation work, the processing-microstructure-property relations are examined for cold spray deposited AA2024 and AA7075. Unlike traditional thermal spray technologies, powders are never melted during the cold ...
• Phase equilibria and reaction kinetics of borides based high-temperature thermoelectric materials 

  Imam, Muhammad Ali (University of Alabama Libraries, 2018)

  In this study, the phase equilibria of the binary borides (Mg-B and Si-B) were determined by solid-state electrochemical measurements. This study provides the equilibrium thermodynamic properties of boride based thermoelectric ...
• Pulsed laser deposited epitaxial oxide thin films for microwave and spintronics applications 

  Singh, Amit V. (University of Alabama Libraries, 2018)

  Oxides are an important class of materials exhibiting properties useful in the modern technological applications. A wide range of oxides are inherently stable, both chemically and thermodynamically. Some members of the ...
• Processing-microstructure relationships in Al-Cu alloys produced by the cold spray deposition process 

  Liu, Tian (University of Alabama Libraries, 2018)

  This dissertation investigates the processing-microstructure relationships during cold spray deposition of binary aluminum-copper alloys. While cold spray has been successfully applied using a variety of engineering alloys, ...
• Correlation between heat input and residual stresses from friction stir welding of AA5052 plate 

  Zhu, Ning (University of Alabama Libraries, 2018)

  This thesis investigates the connections between friction stir welding (FSW) parameters, simple energy/heat input metrics, and the resultant residual stresses on AA5052-H32 plates. A range of weldments were produced with ...
• Phase stability and deformation behavior of nanostructured copper based multilayers 

  Guo, Qianying (University of Alabama Libraries, 2018)

  As metallic multilayers exhibit large surface area-to-volume ratios, their physical and chemical properties can be size dependent. These size dependent changes facilitate both crystallographic phase transformations as well ...
• Investigation of liquid metal embrittlment in advanced high strength steels 

  Briant, Nathaniel P. (University of Alabama Libraries, 2018)

  This thesis explored the susceptibility of ferritic/bainitic, advanced high strength steels to zinc-based liquid metal embrittlement (LME). The understanding of the causes and effects of LME is critical because of the ...
• Magnetic properties and structure of Mn-x alloy thin films 

  Zhao, Siqian (University of Alabama Libraries, 2018)

  Among the rare earth free/less permanent magnet candidates, the L10 MnAl, L10 MnGa and D022 Mn3-δGa (δ=0~1) exhibit high magnetic anisotropy energy, which is of the order of 10^7 erg/cm3, despite the spin orbit coupling ...
• Multi-scale modeling of spatial heterogeneity effect on the shear banding behaviors in metallic glasses 

  Wang, Neng (University of Alabama Libraries, 2018)

  Stronger than steels but able to be shaped and molded like plastics, the mechanical properties of metallic glasses (MGs) are proven to be scientific interest and potential applications in industry. However, MGs suffer from ...
• Relating processing-microstructure-mechanical properties of inconel 718 fabricated by selective laser melting 

  Holland, Sharniece (University of Alabama Libraries, 2018)

  Selective laser melting (SLM), uses a computer controlled scanning beam to selectively melt pre-spread powders in a layer by layer fashion. SLM has become a powerful tool to fabricate Inconel 718 due to the ability to ...
• Nanostructure characterization, fabrication and devices of 1D & 2D ZNO and 2D MOS2 

  Waters, Joseph Lionel (University of Alabama Libraries, 2018)

  One of the main complications in the synthesis of Zinc oxide (ZnO) nanowires (NWs), is the ability to reproduce well aligned wires. ZnO was studied due to its optoelectronic applications. Its simple crystal growth abilities, ...
• Experimental and theoretical investigation of ultrasonic cavitation processing of Al-based alloys and nanocomposites 

  Xuan, Yang (University of Alabama Libraries, 2018)

  Ultrasonic Treatment (UST) is one of the most promising manufacturing methods to refine the microstructure of casting alloys by transforming the morphology of the grains from dendritic to globular, decreasing the grain ...
• Plasticity Mechanisms in HfN at Elevated and Room Temperature 

  Vinson, Katherine; Yu, Xiao-Xiang; De Leon, Nicholas; Weinberger, Christopher R.; Thompson, Gregory B. (2016-10-06)

  HfN specimens deformed via four-point bend tests at room temperature and at 2300 °C (~0.7 Tm) showed increased plasticity response with temperature. Dynamic diffraction via transmission electron microscopy (TEM) revealed ...
• Influence of Grain Boundary Character and Annealing Time on Segregation in Commercially Pure Nickel 

  Welsh, Shery L.; Kapoor, Monica; Underwood, Olivia D.; Martens, Richard L.; Thompson, Gregory B.; Evans, Jeffrey L. (2016)

  Commercially pure nickel (Ni) was thermomechanically processed to promote an increase in Σ3 special grain boundaries. Engineering the character and chemistry of Σ3 grain boundaries in polycrystalline materials can help in ...
• Grain Boundary Specific Segregation in Nanocrystalline Fe(Cr) 

  Zhou, Xuyang; Yu, Xiao-xiang; Kaub, Tyler; Martens, Richard L.; Thompson, Gregory B. (2016-10-06)

  A cross-correlative precession electron diffraction – atom probe tomography investigation of Cr segregation in a Fe(Cr) nanocrystalline alloy was undertaken. Solute segregation was found to be dependent on grain boundary ...
• Lattice Expansion in Nanocrystalline Niobium Thin Films 

  Banerjee, R.; Sperling, E. A.; Thompson, G. B.; Fraser, H. L.; Bose, S.; Ayyub, P. (2003-04-09)

  High-purity nanocrystalline niobium (Nb) thin films have been deposited using high-pressure magnetron sputter deposition. Increasing the pressure of the sputtering gas during deposition has systematically led to reduced ...
• Tuning Phase Stability in Nanocomposite Multilayers 

  Thompson, G. B.; Banerjee, R.; Fraser, H. L. (2003-08-26)

  As thin-film layers in a multilayered stack are reduced in thickness, changes in phase stability can result within the individual layers. These changes in phase are expected to have a significant influence upon the functional ...

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