Engineering Commons^™

Mechanical Behavior Of Metallic Core-Shell Nanoparticles Under Compressive Loading, Phillip Tomich

Graduate Research Theses & Dissertations

Core/shell metallic nanoparticles have been shown to be a promising material type for additive manufacturing in the aerospace and automotive fields. Within additive manufacturing they will be used to accurately make an array of nanoparticles within the grains of metal matrix composites. This in turn will help to strengthen the material while remaining ductility and light weight. In this study, copper/aluminum core/shell nanoparticles are compressed under [100], [110], [111], and [112] directions to showcase their anisotropic material properties. Models of their individual counterparts were also investigated. There are no previous works showing the deformation mechanisms of copper/aluminum core/shell nanoparticles. Molecular …

Strongly Correlated Electron Systems: Rare- And Alkaline-Earth Manganese- And Nickel-Based Perovskite Oxides, Elena Krivyakina

Graduate Research Theses & Dissertations

This work is an academic exploration of the capacity to manipulate the characteristics of strongly correlated electron systems, specifically transition metal perovskite oxides, through chemical substitutions and structural modifications. The high flexibility of the perovskites offers prospects for customizing materials with specific functionalities, thereby holding promise for the advancement of innovative technologies in diverse industries, ranging from electronics and energy to information storage and spintronics. My research focuses on a comprehensive overview of investigations I conducted on three specific compositions, namely alkalineand rare-earth manganese-based and nickel-based oxides, denoted as (Sr, Ba)(Mn, T i)O3−δ, (Y, T b)MnO3+δ, and (Sr, La)N iO3−δ. …

Diffuse Scattering And 3d-∆Pdf Analyses: Order-Disorder Phase Transitions In (Sr1−Xcax)3rh4sn13 And Nano2, Puspa Upreti

Graduate Research Theses & Dissertations

Classification of structural phase transitions as being of the displacive or order-disorder types is usually done based on spectroscopic measurements performed above the transition. Transitions of the displacive type typically occur when soft phonon modes condense upon approaching the phase transition, whereas those of the order-disorder type are characterized by structures in which the atoms are located randomly above the phase transition at T* at the minima of a multiwell potential. In the ordered state, i.e., when T

We have performed single crystal x-ray scattering experiments and three-dimensional pair distribution functions (3D-∆PDF) analyses to understand the nature of phase transitions …