How do energetic ions damage metallic surfaces?

Osetskiy, Yury N.; Calder, Andrew F.; Stoller, Roger E.

doi:10.1016/j.cossms.2014.12.001

Title: How do energetic ions damage metallic surfaces?

Journal Article · Fri Feb 20 00:00:00 EST 2015 · Current Opinion in Solid State and Materials Science

DOI:https://doi.org/10.1016/j.cossms.2014.12.001· OSTI ID:1214465

Osetskiy, Yury N. ^[1]; Calder, Andrew F. ^[2]; Stoller, Roger E. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Liverpool, Liverpool (United Kingdom)

Surface modification under bombardment by energetic ions observed under different conditions in structural and functional materials and can be either unavoidable effect of the conditions or targeted modification to enhance materials properties. Understanding basic mechanisms is necessary for predicting properties changes. The mechanisms activated during ion irradiation are of atomic scale and atomic scale modeling is the most suitable tool to study these processes. In this paper we present results of an extensive simulation program aimed at developing an understanding of primary surface damage in iron by energetic particles. We simulated 25 keV self-ion bombardment of Fe thin films with (100) and (110) surfaces at room temperature. A large number of simulations, ~400, were carried out allow a statistically significant treatment of the results. The particular mechanism of surface damage depends on how the destructive supersonic shock wave generated by the displacement cascade interacts with the free surface. Three basic scenarios were observed, with the limiting cases being damage created far below the surface with little or no impact on the surface itself, and extensive direct surface damage on the timescale of a few picoseconds. In some instances, formation of large <100> vacancy loops beneath the free surface was observed, which may explain some earlier experimental observations.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Defect Physics in Structural Materials (CDP)

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1214465

Alternate ID(s):: OSTI ID: 1251257

Journal Information:: Current Opinion in Solid State and Materials Science, Vol. 19, Issue 5; ISSN 1359-0286

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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Atomistic material behavior at extreme pressures Béland, Laurent Karim; Osetsky, Yuri N.; Stoller, Roger E. npj Computational Materials, Vol. 2, Issue 1 https://doi.org/10.1038/npjcompumats.2016.7	journal	August 2016

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Title: How do energetic ions damage metallic surfaces?

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