An Investigation of the Structure and Properties of Aged Aluminium Bronzes

  • Richard L. Jones

    Student thesis: Doctoral ThesisDoctor of Philosophy

    Abstract

    The ageing response of wrought single phase aluminium bronze alloys
    containing additions of cobalt up to 1% is assessed for use as a
    bolting material by mechanical tests, microstructural examination, and
    constant strain rate stress corrosion trials. The dependence of
    mechanical properties on cobalt concentration, degree of ageing and
    level of cold work is established. The presence of a precipitation
    hardening mechanism is identified. The hardening phase in the final
    stages of the precipitation sequence is shown to be a compound based
    on CoAl having an orientation with respect to the matrix of [101] m||
    [lil] ppt, (111) m || (110) ppt. A susceptibility to stress corrosion
    cracking is established for the alloy system. Two basic mechanisms
    are identified 1) A strain-generated active path mechanism for
    solutions of pH=12 and 2) a pre-existing active path mechanism for a
    sea water environment. The susceptibility to stress corrosion cracking
    in seawater is shown to depend on the metallurgical condition of the
    alloy.
    Date of Award1979
    Original languageEnglish

    Keywords

    • structure
    • properties
    • aged aluminium bron
    • aluminium bronze
    • precipitation
    • stress corrosion

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