Effect of nickel on point defects diffusion in Fe – Ni alloys

Anento, Napoleon; Serra, Anna; Osetsky, Yury N.

doi:10.1016/j.actamat.2017.05.010

Effect of nickel on point defects diffusion in Fe – Ni alloys

Journal Article · Fri May 05 00:00:00 EDT 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2017.05.010· OSTI ID:1357978

Anento, Napoleon ^[1]; Serra, Anna ^[1]; Osetsky, Yury N. ^[2]

Univ. Politecnica de Catalunya. Barcelona-Tech, Barcelona (Spain)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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. As a result, the role of Ni solutes in radiation damage evolution in Fe-Ni alloys is discussed.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1357978

Alternate ID(s):: OSTI ID: 1550536
OSTI ID: 22695887

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 132; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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