Misorientations amp the Coincident Site Lattice Concept取向差amp；重合站点晶格的概念.pptVIP

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Misorientations amp the Coincident Site Lattice Concept取向差amp；重合站点晶格的概念.ppt

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Misorientations

Grain Boundary Engineering Coincident Site Lattice (CSL) Theory L17 from 27-750, Advanced Characterization Microstructural Analysis A. D. Rollett Objectives The objectives of this lecture are: Develop an understanding of grain boundary engineering Explain the theory of coincident lattice sites (CSL) and how it applies to grain boundaries Show how microstructures are analyzed for CSL content References Interfaces in Crystalline Materials, Sutton Balluffi, Oxford U.P., 1998. Very complete compendium on interfaces. Interfaces in Materials, J. Howe, Wiley, 1999. Useful general text at the upper undergraduate/graduate level. Crystal Defects and Crystalline Interfaces, W. Bollmann, (1970). New York, Springer Verlag. Grain Boundary Migration in Metals, G. Gottstein and L. Shvindlerman, CRC Press, 1999. The most complete review on grain boundary migration and mobility. Materials Interfaces: Atomic-Level Structure Properties, D. Wolf S. Yip, Chapman Hall, 1992. Outline Slides from Integran with examples of Grain Boundary Engineered materials CSL theory Brandon’s criterion for classification of grain boundaries by CSL type Technical information on comparative properties of GBE and non-GBE materials Grain Boundary Engineering Grain Boundary Engineering (GBE) is the practice of obtaining microstructures with a high fraction of boundaries with desirable properties. In general, desirable properties are associated with boundaries that have simple, low energy structures. Such low energy structures are, in turn, associated with CSL boundaries. GBE generally consists of repeated cycles of deformation and annealing, chosen so as to generate large fractions of “special boundaries” and avoid development of strong recrystallization textures. GBE is largely confined at present to fcc metallic systems such as stainless steel, nickel alloys, Pb, Cu. Special Grain Boundaries There are some boundaries that have special properties, e.g. low energy. In most known cases (but not all!