Point defect sinks in self‐ion‐irradiated nickel: A self‐diffusion investigation

The diffusion coefficient of 63Ni in pure nickel after irradiation with 300 keV Ni ions has been measured directly using a secondary ion mass spectrometer. The calculated displacement rate for this irradiation ranged from 1.2×10−5 to 3.1×10−2 dpa/s, the dose from 0.2 to 102 dpa, and the temperatures from 293 to 950 K. Between 293 and 650 K the irradiation‐induced diffusion coefficient is temperature independent for a displacement rate of 1.2×10−2 dpa/s. In this temperature range mass transport by atomic mixing prevails over diffusion via point defects (radiation‐enhanced diffusion). Normalized to the displacement rate K’ the diffusion coefficient describing atomic mixing attains a value of Dmix /K’=1.3×10−18 m2 /dpa. The temperature and displacement rate dependence of the radiation‐enhanced diffusion coefficient is discussed in the framework of a rate equation model. The analysis yields a production rate of freely migrating defects of about 1.5% of the calculated displacement rate. The effective concentra...

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