title: Phase and structural transformations in metallic iron under the action of heavy ions and recoil nuclei.
abstract: By the use of various modes of Mössbauer spectroscopy after effects of irradiation of metal iron with (12)C(4+) and (14)N(5+) ions of medium energies, and alpha-particles and the (208)Tl, (208,212)Pb, and (216)Po recoil from a (228)Th-source have been studied. The experimental data obtained in the study enabled various types of external and internal radiation to be compared in regard to the damage they cause, as well as to their effect on the structure-, phase composition- and corrosion resistance properties of metallic iron. Irradiation with (12)C(4+) and (14)N(5+) ions is accompanied by both structural disordering of the α-Fe lattice, and the appearance of γ-phase in the bulk metal. This is indicated by a single line which is 2 to 3-fold broadened (as compared to the lines of the magnetic sextet). This is a result of a strong local heating of the lattice in the thermal spike area with a subsequent instant cooling-down and recrystallization of this "molted" area. Irradiation of iron foils with (12)C(4+)- and (14)N(5+) ions and with recoil nuclei does provoke corrosion processes (the formation of γ-FeOOH) and is accompanied by an intensive oxidation of the metal.
authors.affiliation: V.G. Khlopin Radium Institute, 194021 Saint-Petersburg, Russia; Saint-Petersburg State University, 199034 Saint-Petersburg, Russia. Electronic address: iea-1960@yandex.ru.
authors.forename: I
authors.initials: I
authors.lastname: Alekseev
authors.affiliation: V.G. Khlopin Radium Institute, 194021 Saint-Petersburg, Russia.
authors.forename: D
authors.initials: D
authors.lastname: Novikov
keywords: External and internal irradiation; Metallic iron; Mössbauer spectroscopy; Structural transformations