نتایج جستجو برای: nanoultrafine grain structure
تعداد نتایج: 1622609 فیلتر نتایج به سال:
The aim of this study was to clarify how the microstructural changes during and after phase transformation determine the age-hardenability of an Au-Ag-Cu-based dental alloy. The rapid increase in hardness in the initial stage was the result of rapid atomic diffusion by spinodal decomposition into metastable Ag-rich’ and Cu-rich’ phases. The constant hardening after apparent initial hardening wa...
Interstellar dust grains exhibit complex dynamics which is essential for understanding many key interstellar processes that involve dust, including grain alignment, grain growth, grain shattering etc. Grain rotational and translational motions are affected not only by gaseous collisions, but also by interactions with ions, photons, magnetic fields etc. Some of those interactions, e.g. interacti...
Grain v1 is one of the 7 finalists selected in the final portfolio by the eSTREAM project. It has an elegant and compact structure, especially suitable for a constrained hardware environment. Though a number of potential weaknesses have been identified, no key recovery attack on the original design in the single key model has been found yet. In this paper, we propose a key recovery attack, call...
Understanding of various charging processes of dust grains is important in many different industrial applications as well as in the space research and theoretical studies of charging. An impact of energetic ions onto a dust grain leads to transfer of charge to the grain. This effect increases the charge of the dust grain until an equilibrium value is reached. After charging, the ion beam is swi...
Composite titanium carbonitride (TiCN) thin films deposited on AZ31 by DC/RF magnetron sputtering were vacuum annealed at different temperatures. Vacuum annealing yields the following on the structure and properties of the films: the grain grows and the roughness increases with an increase of annealing temperature, the structure changes from polycrystalline to single crystal, and the distributi...
Institut für Metallkunde und Metallphysik, RWTH Aachen, 52056 Aachen, Germany Carnegie Mellon University, Pittsburgh PA 15213, USA Abstract The migration of planar, symmetric tilt grain boundaries with different tilt axes was investigated. The driving force for the grain boundary migration was due to an external mechanical stress field. Low as well as high angle grain boundaries can move under ...
Because of the complex nature of internal interfaces it has been a continual challenge to link the grain growth behavior of alumina (especially the onset of abnormal grain growth) to the internal interface structure and chemistry, and the associated atomic transport rate. The present work considers the problem of normal and abnormal grain growth development in calcia-doped alumina, a system not...
Large twist-angle grain boundaries in layered structures are often described by Scherk's first surface whereas small twist-angle grain boundaries are usually described in terms of an array of screw dislocations. We show that there is no essential distinction between these two descriptions and that, in particular, their comparative energetics depends crucially on the core structure of their scre...
Large twist-angle grain boundaries in layered structures are often described by Scherk’s first surface whereas small twist-angle grain boundaries are usually described in terms of an array of screw dislocations. We show that there is no essential distinction between these two descriptions and that, in particular, their comparative energetics depends crucially on the core structure of their scre...
Nanofibers, produced by electrospinning a solution containing titanium tetra(IV) isopropoxide, polyvinyl acetate and acetic acid in N,N-dimethyl acetamide, upon sintering at 500 °C produce rice grain-shaped TiO(2) mesostructures. Each rice grain-shaped TiO(2) has a mixed crystal structure and high porosity and the mesostructures are found to have applications in dye-sensitized solar cells.
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