Electron Microscope Investigation of High Angle Grain Boundaries PDF Download
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Author: Wilfried Reinhold Wagner
Publisher:
ISBN:
Category : Grain boundaries
Languages : en
Pages : 324
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Book Description
Author: Wilfried Reinhold Wagner
Publisher:
ISBN:
Category : Grain boundaries
Languages : en
Pages : 324
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Book Description
Author: Diane Vanderwalker
Publisher:
ISBN:
Category : Dislocations in crystals
Languages : en
Pages : 232
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Book Description
Author: Valerie Randle
Publisher: CRC Press
ISBN: 1351409883
Category : Science
Languages : en
Pages : 182
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Book Description
As the selection of material for particular engineering properties becomes increasingly important in keeping costs down, methods for evaluating material properties also become more relevant. One such method examines the geometry of grain boundaries, which reveals much about the properties of the material. Studying material properties from their geometrical measurements, The Measurement of Grain Boundary Geometry provides a framework for a specialized application of electron microscopy for metals and alloys and, by extension, for ceramics, minerals, and semiconductors. The book presents an overview of the developments in the theory of grain boundary geometry and its practical applications in material engineering. It also covers the tunneling electron microscope (TEM), experimental aspects of data collection, data processing, and examples from actual investigations. Each step of the analysis process is clearly described, from data collection through processing, analysis, representation, and display to applications. The book also includes a glossary of terms. Exploring both the experimental and analytical aspects of the subject, this practical reference guide is essential for researchers and students involved in material properties, whether in physics, materials science, metallurgy, or physical chemistry.
Author: L.M Clarebrough
Publisher: Routledge
ISBN: 135145319X
Category : Science
Languages : en
Pages : 446
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Book Description
Electron Microscopy of Interfaces in Metals and Alloys examines the structure of interfaces in metals and alloys using transmission electron microscopy. The book presents quantitative methods of analysis and reviews the most significant work on interface structure over the last 20 years. It provides the first book description of the methods used for quantitative identification of Burgers vectors of interfacial dislocations, including the geometric analysis of periodicities in interface structure and the comparison of experimental and theoretical electron micrographs. The book explores low- and high-angle grain boundaries and interphase interfaces between neighboring grains, emphasizing interfacial dislocations and rigid-body displacements to the structure and properties of interfaces. It also analyzes the use of two-beam images and diffraction patterns for analysis and studies n-beam lattice imaging. The book includes numerous worked examples of the analysis of the structure of grain boundaries and interphase interfaces, which are particularly useful to those who need to consider the nature of intercrystalline interfaces.
Author: Richard Allen Page
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Susan Elizabeth Babcock
Publisher:
ISBN:
Category :
Languages : en
Pages : 714
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Author: L.M Clarebrough
Publisher: Routledge
ISBN: 1351453203
Category : Science
Languages : en
Pages : 435
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Book Description
Electron Microscopy of Interfaces in Metals and Alloys examines the structure of interfaces in metals and alloys using transmission electron microscopy. The book presents quantitative methods of analysis and reviews the most significant work on interface structure over the last 20 years. It provides the first book description of the methods used for quantitative identification of Burgers vectors of interfacial dislocations, including the geometric analysis of periodicities in interface structure and the comparison of experimental and theoretical electron micrographs. The book explores low- and high-angle grain boundaries and interphase interfaces between neighboring grains, emphasizing interfacial dislocations and rigid-body displacements to the structure and properties of interfaces. It also analyzes the use of two-beam images and diffraction patterns for analysis and studies n-beam lattice imaging. The book includes numerous worked examples of the analysis of the structure of grain boundaries and interphase interfaces, which are particularly useful to those who need to consider the nature of intercrystalline interfaces.
Author: Dirk Michael Kirch
Publisher: Cuvillier Verlag
ISBN: 373692576X
Category : Technology & Engineering
Languages : en
Pages : 220
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Book Description
The recent development in experimental research on grain boundary and triple junction migration and structure in metals has been reviewed in this thesis. The dependence of grain boundary mobility on boundary character (misorientation and inclination) as well as the dependency of the triple junction mobility on the junction crystallography was addressed. The motion of individual grain boundaries and triple junctions was investigated in specially grown bi- and tricrystal samples of high purity aluminum. Orientation contrast imaging in an SEM combined with an in-house developed heating stage was used for in-situ tracking of the microstructure evolution at elevated temperatures. Furthermore, a novel laser powered heating stage was developed in order to enable the microstructure and -texture characterization at elevated temperature up to 1000°C. The migration of connected 100 tilt grain boundaries, was studied experimentally as a function of temperature between 400°C and 580°C. The study revealed that the majority of grain boundary systems were controlled by the lower mobility of the curved grain boundaries rather than the triple junction mobility within the investigated temperature range. Solely one grain boundary system (TJ-41) revealed two different kinetic regimes of coupled triple junction - grain boundary motion dependent on temperature proving the existence of a specific triple junction mobility and its dependence on triple junction crystallography. At low temperatures the motion of the grain boundaries was found to be retarded by the low triple junction mobility. In contrast, at elevated temperatures the system kinetics was found to be grain boundary controlled. The migration of grain boundary systems with triple junction, composed of mixed 110 twist and 40° 111 tilt grain boundaries, was studied experimentally in dependence of temperature for a range of boundary misorientations. In analogy to the study on connected 100 tilt grain boundaries, the majority of grain boundary systems were found to be controlled by the lower mobility of the curved grain boundaries. The only exception was found during investigation of the grain boundary system TJ-twist-19 revealing a system migration influenced by the triple junction mobility at all investigated temperatures, confirming the existence of a finite triple junction mobility and its dependence on triple junction crystallography. However, the boundary system TJ-twist-19 was not found to change its state of motion as observed for sample TJ-41. Aluminum bicrystal samples, containing individual 100 and 111tilt grain boundaries, were investigated experimentally in-situ in a temperature range between 300°C and 640°C for a range of boundary misorientations. The study revealed, for both systems, a different behavior of SAGBs in contrast to LAGBs. Grain boundaries with a rotation angle below 15° were found to be immobile during annealing at a given temperature in conjunction with a faceted grain boundary shape. Owing to grain boundary anisotropy the boundary facets correspond to boundary inclinations which possess a particularly low energy as confirmed by additional MS-simulation studies on bicrystals with equivalent crystallography. In contrast, LAGBs with a misorientation angle larger than 15° did not tend to form grain boundary facets. Instead, the grain boundaries assumed a curved shape and moved in steady-state in the entire investigated temperature range, as expected for curvature driven grain boundary motion assuming grain boundary isotropy. The microstructure evolution of individual circular grains in thecourse of grain shrinkage was simulated for bicrystals implementing a 2D-vertex model. The study revealed that the modeled grain shape is consistent with the experimentally observed boundary shape in bicrystal samples with equivalent crystallography. Furthermore, the study revealed that grain boundary anisotropy can affect the rate of grain area change. In the case of grains with a pronounced grain boundary anisotropy, a preferred formation of straight facets composed of low energy boundary planes was observed. As a result, the mean free energy of the grain boundary was reduced, causing a decrease of the capillary driving force. Owing to the decrease of P, the normal velocity of the respective segments decreased likewise, causing a retardation of grain shrinkage. Finally, the author believes that the results of the studies presented here lead to a better understanding of solitary and connected grain boundaries and their role in modern materials science and engineering.
Author: Materials Research Society
Publisher: Pittsburgh, Pa. : Materials Research Society
ISBN:
Category : Science
Languages : en
Pages : 424
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Book Description
The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
Grain boundaries and twin boundaries in commercial Cd{sub 1-x}Zn(subscript x)Te, which is prepared by a high pressure Bridgeman technique, have been investigated with transmission electron microscopy, scanning electron microscopy, infrared light microscopy and visible light microscopy. Boundaries inside these materials were found to be decorated with Te precipitates. The shape and local density of the precipitates were found to depend on the particular boundary. For precipitates that decorate grain boundaries, their microstructure was found to consist of a single, saucer shaped grain of hexagonal Te (space group P3121. Analysis of a Te precipitate precipitates by selected area diffraction revealed the Te to be aligned with the surrounding Cd{sub 1-x}Zn(subscript x)Te grains. This alignment was found to match the (111) Cd{sub 1-x}Z(subscript x)Te planes with the (1{bar 1}01) planes of hexagonal Te. Crystallographic alignments between the Cd{sub 1-x}Zn(subscript x)Te grains were also observed for a high angle grain boundary. The structure of the grain boundaries and the Te/Cd{sub 1-x}Zn(subscript x)Te interface are discussed.
