Defects and deformation in nanostructured metals


Defects and deformation in nanostructured metals

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dc.contributor.advisor Ferreira, Paulo J. S. G.
dc.creator Carlton, Christopher Earl 2010-06-29T16:31:05Z 2010-06-29T16:31:05Z 2009-12 2010-06-29T16:31:05Z
dc.description.abstract A better understanding of how the nanoscale environment affects the mechanical properties of materials, in particular metallic nanoparticles and nanocrystalline metals is vital to the development of next generation materials. Of special interest is obtaining a fundamental understanding of the inverse Hall-Petch Effect in nanocrystalline metals, and nanoindentation in individual nanoparticles. Understanding these subjects is critical to understanding how the mechanical properties of materials are fundamentally affected by nanoscale dimensions. These topics have been addressed by a combination of theoretical modeling and in-situ nanoindentation transmission electron microscopy (TEM) analysis. Specifically, the study of the inverse Hall-Petch effect in nanocrystalline metals will be investigated by a thorough review of the literature followed by a proposed novel theoretical model that better explains the experimentally observed behavior of nanocrystalline metals. On the other hand, the nanoindentation of individual nanoparticles is a very new research topic that has yet to aggregate a large body of experimental data. In this context, in-situ TEM nanoindentation experiments on silver nanoparticles will be first performed to determine the mechanisms of deformation in these nanostructures. A theoretical explanation for the observed deformation mechanisms will be then developed and its implications will be discussed. In addition to nanoparticles, this study will also provide unique and valuable insight into the deformation mechanisms of nanopillars, a growing area of research despite much controversy and speculation about their actual mechanisms of deformation. After studying the novel behavior of both nanocrystalline metals and nanoparticles, useful applications of both classes of materials will be explored. The discussion of applications will focus on utilizing the interesting behaviors explored in the dissertation. Of particular interest will be applications of nanoparticles and nanocrystalline materials to coatings, radiation resistance and super-plastic materials.
dc.format.medium electronic
dc.language.iso eng
dc.rights Copyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.
dc.subject Nanostructured metals
dc.subject Nanoscale
dc.subject Metallic nanoparticles
dc.subject Nanocrystalline metals
dc.subject Inverse Hall-Petch Effect
dc.subject Nanoindentation
dc.subject Deformation
dc.subject Nanopillars
dc.subject Nanoparticles
dc.title Defects and deformation in nanostructured metals
dc.description.department Materials Science and Engineering
dc.type.genre Thesis
dc.type.material text Materials Science and Engineering Materials Science and Engineering The University of Texas at Austin Doctoral Doctor of Philosophy

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