STP955: Radiation-Induced Segregation in Cu-Au Alloys

    Hashimoto, T
    Researcher, Energy Research Laboratory, Hitachi Ltd., Hitachi Ibaraki-ken, 316,

    Rehn, LE
    Group leader and senior scientist, Materials Science Division, Argonne National Laboratory, Argonne, IL

    Okamoto, PR
    Group leader and senior scientist, Materials Science Division, Argonne National Laboratory, Argonne, IL

    Pages: 13    Published: Jan 1987


    Abstract

    Radiation-induced segregation in a Cu-lat.% Au alloy was investigated using in-situ Rutherford backscattering spectrometry. Irradiation with 1.8-MeV helium produced nonequilibrium gold atom depletion in the near surface region. The amount of segregation was measured as a function of dose, dose rate, and temperature. Segregation was observed in the temperature range between about 300 and 500°C. For a calculated dose rate of 3.9 × 10−5 dpa/s, the radiation-induced segregation rate peaked near 400°C. Theoretical analysis based on the Johnson-Lam model predicted that the amount of segregation would be directly proportional to dose at the early stage of irradiation, would deviate from linearity with a continuously decreasing slope at intermediate doses, and finally approach a constant value after high doses. The analysis also predicted that the segregation rate would vary as the −¼th power of the dose rate at constant dose in the low temperature region. These predictions were all verified experimentally. A procedure for extracting relative defect production efficiencies from similar measurements is discussed.

    Keywords:

    radiation effects, radiation-induced segregation, binary alloys, Rutherford backscattering spectrometry, defect production efficiency


    Paper ID: STP33852S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP33852S


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