In order to understand the stress behaviors in thin films, three related topics were investigated. First, intrinsic stress generation mechanisms were studied by in-situ stress …
For non-stoichiometric oxide thin films (e.g. ceria and titania) in constrained geometries the variation in oxygen partial pressures lead to stresses, thus termed compositional stresses. …
In polycrystalline materials where transgranular cleavage is the preferred fracture mode, the crystallographic misorientation of fracture planes across grain boundaries can provide resistance to crack …
The increasing demand for materials that can perform at high temperatures beyond the capabilities of Ni-base superalloys has generated interest in refractory metal-based systems (Mo-based …
Exploiting the exceptional mechanical properties of nanostructured carbon for improving wear and erosion resistance of various surfaces is the main objective of the research presented …
With increasing awareness of lead's harmful effects to the environment and human health, there is a large drive toward lead free products. One of the …
Due to its excellent mechanical, tribological and biocompatibility properties, polycrystalline diamond is a promising coating material on metallic implants. However, the biological responses of diamond …
Silicon (Si) is widely viewed as a potential negative electrode material for the next generation of high energy density, rechargeable Li ion batteries. Although Si …
Current aircraft jet engines use nickel-based superalloys in the hot sections. Their operation temperature is about 1050°C. To enhance performance and fuel efficiency, materials that …
This thesis documents a study of the high strain rate deformation behavior of Ni-containing steels of interest to the U.S. Navy for ship structures. A …
Amorphous oxide semiconductor (AOS) thin film transistors (TFTs) based on In2O3 have attracted much interest for use as pixel switching elements in next generation active-matrix …
Self-organized pattern formation can be produced by low energy ion bombardment. A continuum theory explains the ion-induced surface morphology evolution in terms of a balance …
Energy storage is a crucial aspect of integrating renewable energy sources in power grids, portable electronic devices and vehicle applications, making the development of efficient …
The Solid Electrolyte Interphase (SEI) forms in most Li-ion batteries, but properties such as its formation mechanism are a mystery. The goal of this dissertation …
Oxide materials have been a focus of recent thermoelectric research due to their thermal and chemical stability as well as cost effectiveness. In this thesis …
Whiskers are conductive filaments that spontaneously form on Sn-based coatings. They are a critical reliability issue as they can cause short circuits in electronic systems. …
Calcia-magnesia-alumino-silicate (CMAS) deposits cause spallation and degradation of thermal barrier coatings (TBCs), which are used to insulate and protect metallic components in gas turbine engines. …
Abstract of “Investigations on mechanical property - microstructure correlations in CMC Coatings” by Sugeetha Vasudevan, Ph.D., Brown University, May 2016 Carbon nanotubes (CNTs) are being …
The field of photovoltaics has been experiencing a revolution with emergence of perovskite-based solar cells (PSCs). While the swift rise in power conversion efficiencies (PCEs) …