Ion irradiation induced surface composition modulation in equiatomic binary alloys

Kim, Byung Hyun; Kim, Sang-Pil; Kang, Joonhee; Chung, Yong-Chae; Kim, Kyung-Suk; Lee, Kwang-Ryeol

doi:10.1016/j.apsusc.2020.148103

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Ion irradiation induced surface composition modulation in equiatomic binary alloys

Kim, Byung Hyun;
Kim, Sang-Pil;
Kang, Joonhee;
Chung, Yong-Chae;
Kim, Kyung-Suk;
외 1명

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초록

Composition modulation by Ar bombardment on the Co0.5Cu0.5 alloy and the CoAl B2 phase was investigated on atomic scale by molecular dynamics simulation. The Ar bombardment on alloys at 300 K revealed that this bombardment induces a surface composition modulation in the layer-by-layer mode. In both the Co0.5Cu0.5 alloy and the CoAl B2 phase, the element of higher-sputtering yield is accumulated on the top surface layer, whereas it is depleted in lower layers, which is puzzling in the framework the conventional sputtering theory. A phenomenological kinetic model derived from the MD simulation results considering both the rearrangement and the sputtering of the substrate atoms successfully demonstrated that the rearrangement of the substrate atoms plays a significant role in the observed composition modulation.

키워드

Ion irradiation; Ion bombardment; Sputtering; Equiatomic alloys; Molecular dynamics; Aluminum alloys; Argon; Atoms; Cobalt alloys; Copper alloys; Ion bombardment; Modulation; Molecular dynamics; Sputtering; Composition modulations; Conventional sputtering; Kinetic modeling; Layer-by layer mode; MD simulation; Molecular dynamics simulations; Sputtering yields; Substrate atom; Binary alloys

제목: Ion irradiation induced surface composition modulation in equiatomic binary alloys

저자: Kim, Byung Hyun; Kim, Sang-Pil; Kang, Joonhee; Chung, Yong-Chae; Kim, Kyung-Suk; Lee, Kwang-Ryeol

DOI: 10.1016/j.apsusc.2020.148103

발행일: 2021-02

유형: Article

저널명: Applied Surface Science

권: 540

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