Phase stability and deformation behavior of nanostructured copper based multilayers

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dc.contributorLi, Lin
dc.contributorNing, Haibin
dc.contributorWang, Ruigang
dc.contributorWeaver, Mark Lovell
dc.contributor.advisorThompson, Gregory B.
dc.contributor.authorGuo, Qianying
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2018-12-14T18:12:06Z
dc.date.available2018-12-14T18:12:06Z
dc.date.issued2018
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractAs metallic multilayers exhibit large surface area-to-volume ratios, their physical and chemical properties can be size dependent. These size dependent changes facilitate both crystallographic phase transformations as well as alternations in deformation mechanisms. These topics were studied using a series of Cu based thin film architectures, where Cu was deposited between either crystalline phases, i.e. Nb or V for phase stability studies, or glassy phase, i.e. Cu45Zr55, for deformation studies. The phase stability of all the layers were monitored through real time stress measurements during the growth of the films coupled with post growth characterization methods including X-ray diffraction (XRD), transmission electron microscopy (TEM), and atom probe tomography (APT). Face centered cubic (fcc) phase transformation was detected in both multilayered systems, explained by the reduction of interfacial energy. An additional vitrification phase transformation was observed in the crystalline and Cu/Nb system owing to clusters formations at the interfaces. For the in situ deformation studies, the crystalline Cu/ amorphous Cu45Zr55 multilayers were studied by indentation and high cycle fatigue in the TEM. Precession electron diffraction (PED) quantified the grain size, grain misorientation and texture. Grain rotation, facilitated by the free surface of the TEM foil, and grain growth, were observed to be primary deformation mechanisms in the crystalline layers of the multilayers.en_US
dc.format.extent194 p.
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otheru0015_0000001_0003112
dc.identifier.otherGuo_alatus_0004D_13494
dc.identifier.urihttp://ir.ua.edu/handle/123456789/5244
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.en_US
dc.subjectMaterials science
dc.titlePhase stability and deformation behavior of nanostructured copper based multilayersen_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Metallurgical and Materials Engineering
etdms.degree.disciplineMetallurgical/Materials Engineering
etdms.degree.grantorThe University of Alabama
etdms.degree.leveldoctoral
etdms.degree.namePh.D.
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