Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 12 of 12 for “"Polycrystalline material"”.
-
Design and fabrication of polycrystalline material thin-film transistors for active matrix liquid-crystal display and static random access memory applications
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
-
Triple junctions and low angle boundaries
… types of boundaries may be more beneficial for material properties. The way that the boundaries are connected in a material can determine how boundaries will affect properties, for instance, whether or not crack resistant boundaries will arrest the growth of a crack. Boundaries in a …
-
Exploring crystallographic compatibility in polycrystalline Cu-based shape-memory alloys
Shape-memory alloys (SMAs) are a class of materials that can recover from apparent permanent strain (on the order of 5%) due to a solid-to-solid phase transformation. It has been recently suggested that SMAs satisfying a set of so-called cofactor conditions possess perfect interface compatibility …
-
Fabrication and characterization of Ni-Mn-Ga ferromagnetic shape-memory alloy composites
… (FSMAs) are a recently-developed class of active materials which show large extensional strains when a magnetic field is applied. Shear strains of 6% have been observed at room temperature in martensitic Ni-Mn-Ga single crystals. The strain effect in Ni-Mn-Ga FSMAs is a result of twin boundary …
-
Analysis of crystallographic texture information by the hyperspherical harmonic expansion
… of crystalline orientations in a given polycrystalline material. Traditionally, the orientation distribution function describing crystallographic orientation information is written as a linear combination of the generalized spherical harmonics. Since the use of generalized spherical …
-
Normal state properties of high-angle grain boundaries in Y$_{1-x}$Ca$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-}$$_\delta$
… YBCO is a high-temperature superconducting material with a superconducting transition temperature up to 93 K. Grain boundaries are interfaces between two crystals or grains, and severely reduce the attainable currents in practical, polycrystalline material. A grain boundary is characterised …
-
Deformation and residual stresses at the intragranular scale – a study using high energy x-ray diffraction and modeling in polycrystalline alloys
Deformation and internal stress distribution in polycrystalline materials depend upon interactions among neighboring grains and sub-grains (substructure inside a grain). With the advent of high energy x-ray diffraction (HEXD), using synchrotron radiation, it has become possible to probe the bulk of …
-
High temperature deformation mechanisms and strain heterogeneities in calcite rocks
… grains and heterogeneous deformation within the polycrystalline material. In Chapter 3, a new technique including a series of sample preparation and image analysis algorithms is developed to provide quantitative measurements of the scale of heterogeneities produced, and to gain fundamental …
-
Grain boundary network design
… observed to have a strong influence on many materials properties. This observation suggests that if we could control the types of grain boundaries present in a polycrystal and their spatial arrangement then it would be possible to dramatically improve the properties of polycrystalline …
-
Interplay between mineral reaction and deformation via structural defects
… widths. In CHAPTER 4, the influence of starting material microfabrics and the presence of water on the reaction kinetics was evaluated. In these experimental series polycrystalline material was in contact with single crystals or two polycrystalline materials were used as reactants. Isostatic …
-
Quantitative understanding of the role of grain boundaries in polycrystalline deformation via multiscale digital image correlation
… used to measure plastic strain accumulation in polycrystalline Hastelloy X, a nickel-based superalloy, subjected to monotonic and cyclic loading conditions. In addition, the underlying microstructure was characterized with similar spatial resolution using electron backscatter diffraction (EBSD). …
-
New fluorene based materials for organic electronics
… fluorene and bithiophene building blocks. Such materials are attractive candidates for application in organic light emitting diodes (OLEDs) and organic field effect transistors (OFETs). The first part of my thesis deals with the synthesis of reactive mesogens with conjugated fluorene units and …