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 20 of 21 for “"texture evolution"”.
-
Grain growth and texture evolution in thin films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
-
Plastic deformation and crystallographic texture evolution in face-centered cubic metals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
-
Role of low-energy ion/surface interactions in controlling microstructure and texture evolution during film growth
The effects on microstructure and microchemistry of ion irradiation during AlCu film growth on a-SiO$\sb2$ by two directional sputtering techniques--collimated magnetron sputter deposition (CMSD) and ionized magnetron sputter deposition (IMSD)--were investigated. Both sets of films have dense …
-
Texture evolution in metal nitride (aluminum nitride, titanium nitride, hafnium nitride) thin films prepared by off-normal incidence reactive magnetron sputtering
<p>We studied the development of crystallographic texture in aluminum nitride (AlN), titanium nitride (TiN) and hafnium nitride (HfN) films deposited by off-normal incidence reactive magnetron sputtering at room temperature in N2/Ar mixtures. Texture measurements were performed by x-ray pole figure …
-
PRODUCTION OF NON-ORIENTED ELECTRICAL STEEL THIN STRIP SIMULATING CONDITIONS OF THE DIRECT TWIN-ROLL CASTING PROCESS
… magnetic properties, grain growth, and texture evolution of 3.4 wt.% Si NGO electrical steel with different carbon and sulfur (C&S) levels were analyzed. Samples were thermo-mechanically treated which simulated an industrial TRSC process. After a long time, batch annealing, low C&S 25% …
-
Phase Composition, Microstructure, and Physical Properties of Poly- and Single-Crystal Tantalum Nitride Layers
… discharges initially exhibit competitive texture evolution until a single texture dominates at t ≳ 200 nm. The preferred orientation of 500-nm-thick Ei = 20 eV layers can be selectively and continuously varied from predominantly underdense 111 to nearly complete dense 002 by varying …
-
Investigating effects of interpass time during hot finish rolling on the evolution of texture in AA3104 Can Body Stock
… length leads to non-uniform microstructure and texture development, which impacts material properties. This study investigated the microstructure and texture evolution in AA3104 can body stock (CBS) during hot finish rolling by simulating multi-pass, high-temperature plane strain compression …
-
Effects of Laser Shock Peening on Residual Stress, Texture and Deformation Microstructure of Ti-6Al-4V Alloy
… strain/stress distributions, microstructure and texture evolution is still challenging. The present study was undertaken to develop a basic understanding of the effects of LSP on the residual strain/stress distributions, texture evolution and deformation microstructural changes in Ti-6Al-4V …
-
Control of Microstructure and Texture in Nanocrystalline Transition -Metal Nitride Coatings by Ion Beam Assisted Deposition Method
… pole figures showed that the films were highly textured. By the control of ion beam energy, JI/J M ratio, incident angle, and the deposition temperature, seven kinds of textures were observed. Four parameters, (1) surface energy, (2) strain energy, (3) adatom mobility, (4) preferential …
-
A continuum model for needlepunched nonwoven fabrics
… components, accompanied by an irrecoverable evolution of the texture of the fiber network. In this work, we propose a three-dimensional, large strain continuum model for the constitutive behavior of nonwoven fabrics that accounts for the fiber network characteristics responsible for its …
-
Deformation and Its Effect on Recrystallization in Magnesium Alloy AZ31
… 0.30, 0.40, 0.56, and 0.77. The microstructure evolution was examined using a combination of optical metallography (OM), Electron Backscattered Diffraction (EBSD), Transmission Electron Microscopy (TEM) and X-ray diffraction (XRD). The results revealed significant activity of basal and non-basal …
-
Microstructure and texture development in AISI430 ferritic stainless steel
… and ferrite influences the microstructure evolution and texture development during hot rolling and subsequent annealing heat treatments. Two AISI 430 FSS heats of varying austenite volume fraction were used in this study. The two AISI 430 FSS heats were deformed using the first three passes …
-
Investigation and modeling of processing-microstructure-property relations in ultra-fine grained hexagonal close packed materials under strain path changes
… microstructural features, crystallographic texture evolutions and mechanical responses under strain path changes. UFG hcp materials, including commercial purity Ti, Ti-6Al-4V alloy and high purity Zr, were fabricated using equal channel angular extrusion (ECAE) as a severe plastic …
-
Nano-scale Glucose Fuel Cells for Energy Harvesting in the Human Body Based on Proton Conduction in Cerium Oxide
… Raman spectroscopy can be employed to observe texture evolution in ceria thin films, which is relevant for both glucose fuel cells and other catalytic applications. Overall, this thesis constitutes a study of the processing, structure, proton transport, and device development of ceria, …
-
Calibration of empirical, semi-empirical, and physics-based material models for the prediction of creep and tensile behaviour of Alloy 617
… captured the stress–strain response and texture evolution but showed reduced accuracy in predicting individual grain rotation. The results from all three studies are then synthesised to assess the predictive accuracy, robustness, generalisability, interpretability, and calibration …
-
In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys
… and correlate them with microstructure evolution. In this current work, we aim to provide some insights quantify evolution of internal state variables (ISVs) like volume fraction under biaxial loading conditions.The first part of the thesis examines the role of loading history on …
-
Some problems in hot rolling of al-alloys solved by the finite element method
… changes and lateral deformation, simulating the evolution of substructure, modelling static recrystallisation and designing the rolling pass schedule. A practical pass schedule supplied by an aluminium company and containing reliable measured data of roll load and torque is analysed by a …
-
Correlation between homogenisation parameters and property evolution of AA3104 CBS after hot finish rolling
… affecting mechanical performance and texture evolution in following rolling stages. This study investigates the impact of different homogenisation procedures on the microstructure and mechanical properties of AA3104 during lab-scale hot rough rolling and plane strain compression (PSC) …
-
MEMS Technologies for Energy Harvesting and Sensing
… (TTT) diagrams are used to document texture evolution during thermal treatment of ceramics. Multinomial and multivariate regression techniques were utilized to create the predictor models for TTT data of Pb(Zr0.60Ti0.40 O3) sol-gel thin films. (2) We correlated the composition …
-
Mixed-Phase Solidification of Thin Silicon Films on Silicon Dioxide
… films with strong (100)-surface texture (>99%) on SiO2. Such a combination of microstructural attributes makes the resulting MPS material well-suited for high-performance electronic and photovoltaic applications. The MPS method was conceived based on a well-known phenomenon of …
Page 1 of 2