How do energetic ions damage metallic surfaces?
Abstract
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,more »
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Liverpool, Liverpool (United Kingdom)
- Publication Date:
- Research Org.:
- 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 Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1214465
- Alternate Identifier(s):
- OSTI ID: 1251257
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Current Opinion in Solid State and Materials Science
- Additional Journal Information:
- Journal Volume: 19; Journal Issue: 5; Journal ID: ISSN 1359-0286
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; radiation damage; displacement cascade; surface modification; shock wave; Iron
Citation Formats
Osetskiy, Yury N., Calder, Andrew F., and Stoller, Roger E. How do energetic ions damage metallic surfaces?. United States: N. p., 2015.
Web. doi:10.1016/j.cossms.2014.12.001.
Osetskiy, Yury N., Calder, Andrew F., & Stoller, Roger E. How do energetic ions damage metallic surfaces?. United States. https://doi.org/10.1016/j.cossms.2014.12.001
Osetskiy, Yury N., Calder, Andrew F., and Stoller, Roger E. Fri .
"How do energetic ions damage metallic surfaces?". United States. https://doi.org/10.1016/j.cossms.2014.12.001. https://www.osti.gov/servlets/purl/1214465.
@article{osti_1214465,
title = {How do energetic ions damage metallic surfaces?},
author = {Osetskiy, Yury N. and Calder, Andrew F. and Stoller, Roger E.},
abstractNote = {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.},
doi = {10.1016/j.cossms.2014.12.001},
journal = {Current Opinion in Solid State and Materials Science},
number = 5,
volume = 19,
place = {United States},
year = {Fri Feb 20 00:00:00 EST 2015},
month = {Fri Feb 20 00:00:00 EST 2015}
}
Web of Science
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