rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Synthesis and Properites of Nanotwinned Silver and Aluminum
  name:
    name part: Bufford, Daniel Charles
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Zhang, Xinghang
    role:
      role term: thesis advisor.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2013
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Recent studies of fcc metals with dense twins (~10 nm spacing) have revealed impressive mechanical properties, along with improved ductility and electrical conductivity in comparison to nanocrystalline metals with similar feature sizes. Many important fcc metals could benefit from these "nanotwinned" microstructures, however, not all fcc metals readily form such twins. The tendency of fcc metals to form twin boundaries is related to the twin boundary energy; those with low twin boundary energy, such as silver (Ag), easily form twins. Increasing twin boundary energy interferes with twin formation, to the point that in metals with high twin boundary energy, like aluminum (Al), twins are quite rare. This thesis focuses on the synthesis of nanotwinned Ag and Al via physical vapor deposition. Nanotwinned Ag is readily fabricated, however, a template approach had to be developed to induce twins in Al. The microstructures and their relationships to observed mechanical properties are also discussed. Grain boundaries interfere with dislocation transmission by posing a slip system discontinuity between grains. Twin boundaries are a special class of grain boundaries in which the grains on either side of the boundary are related by mirror symmetry. Twin boundaries inhibit dislocation transmission, providing strength in the same manner as grain boundaries. However, their symmetrical structure reduces the free volume and grain boundary energy. Accordingly, coherent twin boundaries are often more energetically stable than grain boundaries, and their coherency allows plasticity mechanisms to remain active under conditions where such mechanisms may be inhibited at grain boundaries. Hence, twin boundaries may provide a metal with unique combinations of high strength and good ductility, conductivity, and thermal stability. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/151117
  note: by Daniel Charles Bufford.
  note: "Major Subject: Materials Science and Engineering"
  note: Includes vita.
  note: Doctor of Philosophy Texas A & M University 2013 http://hdl.handle.net/1969.1/151117
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Materials Science and Engineering
  subject:
    topic: silver
  subject:
    topic: aluminum
  subject:
    topic: transmission electron microscopy
  subject:
    topic: nanoindentation
  subject:
    topic: magnetron sputtering
  subject:
    topic: twin boundaries
  subject:
    topic: mechanical properties
  identifier: http://hdl.handle.net/1969.1/151117
  record info:
    record content source: TXA
    record creation date: 140326
    record change date: 20151206092821.0
    record identifier: in00003434895
    language of cataloging:
      language term: eng