• FAQ
    • Deposit your work
    • Login
    View Item 
    •   Rice Scholarship Home
    • Rice University Graduate Electronic Theses and Dissertations
    • Rice University Electronic Theses and Dissertations
    • View Item
    •   Rice Scholarship Home
    • Rice University Graduate Electronic Theses and Dissertations
    • Rice University Electronic Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Thermodynamics of hydrogen and vacancies in metals

    Thumbnail
    Name:
    3047338.PDF
    Size:
    2.878Mb
    Format:
    PDF
    View/Open
    Author
    Mao, Juanjuan
    Date
    2002
    Advisor
    McLellan, Rex B.
    Degree
    Doctor of Philosophy
    Abstract
    This thesis studies metal-hydrogen systems. The interaction between hydrogen-atoms and vacancies in metals have been elucidated in Fermi-Dirac statistics. Calculations have been presented and compared for specific models in which H-atoms act both as simple interstitial species and form either decorated vacancies or substitutional defects. A model has been presented to explain the superabundant vacancy formation under high hydrogen pressures. The solutions based on these models apply to much lower temperatures and higher concentrations than the traditional ones. These results show abundant vacancies will be formed in the presence of hydrogen; the vacancy concentration is many orders of magnitude larger than those in the H-free lattice. A study of the diffusion of hydrogen in the crack tip area has been provided. The slow diffusivity of H-atoms at low temperatures and the interaction between H-atoms and vacancies in the crack tip plastic zone give an explanation of the experimental data which show a maximum crack growth rate at room temperature. This work is associated with the embrittlement of steel by hydrogen.
    Keyword
    Engineering; Materials science
    Metadata
    Show full item record
    Collections
    • Rice University Electronic Theses and Dissertations [10740]

    Home | FAQ | Contact Us
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
     

     

    Browse

    Entire ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsTypeThis CollectionBy Issue DateAuthorsTitlesSubjectsType

    My Account

    Login

    Statistics

    View Usage Statistics

    Home | FAQ | Contact Us
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892