Acoustic Activation of Radiation Defect Migration in Nanocrystalline Material Under Neutron or Ion Bombardment
In the model of the nonlocal thermoelastic peak of low-energy ion, the acoustic action of low-energy (1/10 keV) ions or recoils on point defects in nanocrystalline material was investigated. The amplitude of the thermoacoustic pulse generated due to energy transfer from an incident ion to the target material is found using a spherical approximation of the thermoelastic peak. The spatial dependence of the amplitude of generated pulse adjusted for sound absorption follows a power law rather than the exponential one. Due to such long-range action, the acoustic pulses from the ions of Ti+ bombarding the nanocrystalline TiN target can activate migration of interstitial defects at distances up to 15 nm and considerably reduce the activation energy of migration process at distances up to 50 nm.
KeywordsNanocrystalline material Ion bombardment Thermoacoustic wave Radiation defect migration
This research was carried out within the framework of the joint scientific project of the National Academy of Sciences of Ukraine and the National Academy of Sciences of Belarus “Creation of radiation-resistant nanostructured metal and nitride coatings based on titanium, aluminum, and chromium by vacuum-arc deposition from filtered plasma,” 2018.
(Reg. No. of Ukrainian projects: 02-03-18).
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