Radiation-induced segregation in Cu-Au alloys
Irradiation produced Au atom depletion in the near surface region. Since the analysis of measurements of Au diffusion in Cu in terms of the five-frequency model predicts that vacancies preferentially transport Au atoms toward the surface, interstitials are apparently responsible for the observed Au atom depletion. Segregation occurred in the temperature range between about 300 and 500/sup 0/C. It peaked near 400/sup 0/C for a calculated dose rate of 3.9 x 10/sup -5/ dpa/s. Theoretical analysis based on Johnson-Lam model predicted: (1) that the amount of segregation would be proportional to dose in 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; (2) that segregation rate would vary as -1/4th power of the dose rate at constant dose in the low temperature region. The ratio of segregation rate which was obtained by polynomial fitting agreed well with -4th root of dose rate ratio.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6147486
- Report Number(s):
- CONF-8604119-1; ON: DE86005528
- Country of Publication:
- United States
- Language:
- English
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