Effect of nickel on point defects diffusion in Fe – Ni alloys. (15th June 2017)

• Record Type: Journal Article
• Authors: Anento, N.; Serra, A.; Osetsky, Y.
• Is Part Of: Acta materialia. Volume 132(2017)
• Page Start: 367
• Page End: 373
• Publication Date: 2017-06-15
• Subjects: Diffusion -- Fe-Ni alloy -- Radiation effects -- Molecular dynamics; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2017.05.010
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Iron-Nickel alloys are perspective alloys as nuclear energy structural materials because of their good radiation damage tolerance and mechanical properties. Understanding of experimentally observed features such as the effect of Ni content to radiation defects evolution is essential for developing predictive models of radiation. Recently an atomic-scale modelling study has revealed one particular mechanism of Ni effect related to the reduced mobility of clusters of interstitial atoms in Fe-Ni alloys. In this paper we present results of the microsecond-scale molecular dynamics study of point defects, i.e. vacancies and self-interstitial atoms, diffusion in Fe-Ni alloys. It is found that the addition of Ni atoms affects diffusion processes: diffusion of vacancies is enhanced in the presence of Ni, whereas diffusion of interstitials is reduced and these effects increase at high Ni concentration and low temperature. The role of Ni solutes in radiation damage evolution in Fe-Ni ferritic alloys is discussed. Graphical abstract: Image