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Registration Number

0220U102140, 0116U005253 , R & D reports

Title

Study of changes of the structural state and properties in metals, alloys and carbon materials promising for use in nuclear power engineering, under the influence of severe plastic deformation, irradiation, saturation by fission products and gradient emagnetic and electric fields

Head

Sokolenko Volodimir I., Доктор фізико-математичних наук

Registration Date

10-03-2020

Organization

National Science Center "Kharkiv Institute of Physics and Technology"

Description

Research report: p. 41, fig. 25, table. 4, lit. sources 32, publications 20. Objects of study: tungsten, molybdenum, high-entropy alloy Al0,5CоСuCrNiFe, zirconium, titanium. Purpose of work: to find out the atomic mechanisms of radiation erosion and radiation-induced surface self-diffusion, as well as the processes of evolution of helium irradiated surface structure W and Mo; obtaining data on mechanisms of thermo-activated mobility of structural defect elements and their interaction with elementary excitations of the crystal lattice in metals. Research methods - field ion microscopy, mathematical modeling, pulse method of acoustic bridge. Research results It is shown that radiation erosion of the W and Mo surface at low energy (100-150 eV) helium irradiation is related to the cascade output of displaced interstitial atoms. The phenomenon of long-range interaction of self-interstitial atoms with adatoms of radiation origin is revealed. As a result of such interaction, irradiation of W by helium atoms of keV energies results in self-consistent formation of surface chains of adatoms with interatomic distances of about one nanometer. It has been established that radiation-stimulated surface displacement of delocalized surface vacancies (voidions) can lead to self-consistent collective displacement of large groups of surface atoms, providing radiation self-healing of surface vacancy clusters. New fundamental data are obtained concerning the temperature dependence (78-300 K) of acoustic and elastic properties for high-entropy alloy Al0,5CоСuCrNiFe, submicron zirconium and titanium. Keywords: tungsten, molybdenum, field ion microscopy, low-energy irradiation, helium, acoustic studies, high-entropy alloy, zirconium, titanium.

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