Radiation-induced segregation in Cu-Au alloys. [1 at. % Au]

Conference · Mon Mar 31 23:00:00 EST 1986

OSTI ID:5587586

Hashimoto, T; Rehn, L E; Okamoto, P R

Radiation-induced segregation in a Cu-1 at. % Au alloy was investigated using in situ Rutherford Backscattering Spectrometry. Irradiation with 1.8-MeV He produced nonequilibrium Au 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 between 300 and 500/sup 0/C. For a calculated dose rate of 3.9 x 10/sup -5/ dpa/s, the radiation-induced segregation rate peaked near 400/sup 0/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 -1/4th 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.

• Research Organization: Argonne National Lab., IL (USA). Materials Science and Technology Div.; Hitachi Ltd., Ibaraki (Japan). Energy Research Lab.
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5587586
• Report Number(s): CONF-860605-19; ON: DE86014492
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
BACKSCATTERING
BEAMS
CHARGED PARTICLES
COPPER ALLOYS
COPPER BASE ALLOYS
DOSE RATES
ELASTIC SCATTERING
ENERGY RANGE
GOLD ALLOYS
HELIUM IONS
HIGH TEMPERATURE
ION BEAMS
IONS
MEV RANGE
MEV RANGE 01-10
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RUTHERFORD SCATTERING
SCATTERING
SEGREGATION
TEMPERATURE DEPENDENCE