Open AccessRADIATION INDUCED SOFTENING OF CRYSTALS
Author(s) -
V.I. Dubinko,
Valeriy Borysenko,
В.А. Кушнир,
I.V. Khodak,
V.V. Mytrochenko,
V.O. Gamov
Publication year - 2021
Publication title -
problems of atomic science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.216
H-Index - 17
eISSN - 1562-6016
pISSN - 1682-9344
DOI - 10.46813/2021-136-022
Subject(s) - softening , irradiation , hardening (computing) , phonon , materials science , crystallographic defect , amplitude , vibration , crystal (programming language) , lattice (music) , atom (system on chip) , condensed matter physics , radiation damage , radiation , softening point , breather , crystal structure , atomic physics , molecular physics , composite material , chemistry , crystallography , optics , physics , nonlinear system , nuclear physics , quantum mechanics , layer (electronics) , computer science , acoustics , embedded system , programming language
Under irradiation of crystals, atomic vibrations of the lattice that are large enough in amplitude so that the linear approximation and therefore the conventional phonon description of the lattice is not enough. At the same time, these vibrations are localized and can travel long distances in a crystal lattice [1, 2]. In metals and other crystals, they are called discrete breathers (DBs), which are the secondary products of irradiation damage, the primary one being the creations of defects that involve atom displacements to produce point and extended defects, which results in radiation induced hardening (RIH). A part of the remaining energy transforms in DBs before decaying into pho-nons. Thus, while a material is being irradiated in operational conditions, as in a reactor, a considerable amount of DBs with energies of the order of one eV is produced, which helps dislocations to unpin from pinning centers, pro-ducing Radiation Induced Softening (RIS), which opposes RIH [3, 4]. This effect is investigated under (in-situ) im-pulse and steady-state electron irradiation.