Stability of Nanoporous Metals

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dc.contributor.authorCrowson, Douglas A.en
dc.contributor.committeechairCorcoran, Sean G.en
dc.contributor.committeecochairFarkas, Dianaen
dc.contributor.committeememberReynolds, William T. Jr.en
dc.contributor.committeememberBatra, Romesh C.en
dc.contributor.committeememberWang, Yuen
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T20:13:28Zen
dc.date.adate2006-10-12en
dc.date.available2014-03-14T20:13:28Zen
dc.date.issued2006-06-14en
dc.date.rdate2007-10-12en
dc.date.sdate2006-06-24en
dc.description.abstractA study of the stability of bicontinuous nanoporous metals is presented. Atomic scale simulations are used to probe the dominant mechanisms of geometric relaxation in these materials. A method is presented for generating model bicontinuous metal / void structures for use in atomistic simulations of bicontinuous nanoporous solids. The structures are generated with periodic boundary conditions using a phase-field model to simulate the spinodal decomposition of an ideal system. One phase in the model is then associated with the pore volume while the other phase is associated with the metal ligaments. Small angle neutron scattering was used to quantitatively compare experimental samples to those generated by the phase field method. EAM results using model structures with experimentally accessible length scales are presented which demonstrate the potential of such simulations in understanding the behavior of nanoporous metals. Simulated relaxations of these structures, as well as the relaxation of model spherical clusters, indicate that the surface relaxation effect dominates the overall dimensional relaxation of np-metals post processing. Capillary effects play a secondary role in the overall relaxation. The simulation results presented also identify a maximum surface area to volume ratio necessary to maintain mechanical stability beyond which the pore structure collapses.en
dc.description.degreePh. D.en
dc.identifier.otheretd-06242006-163956en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06242006-163956/en
dc.identifier.urihttp://hdl.handle.net/10919/28111en
dc.publisherVirginia Techen
dc.relation.haspartpermission_elsevier.pdfen
dc.relation.haspartCrowson_3803.pdfen
dc.relation.haspartCrowson_3803online.pdfen
dc.relation.haspartDA_Crowson_Stability_of_Nanoporous_Metals.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsurface relaxationen
dc.subjectEAMen
dc.subjectdealloyingen
dc.subjectporous metalsen
dc.subjectsurface stressen
dc.titleStability of Nanoporous Metalsen
dc.typeDissertationen
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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