Ion Irradiation Induced Surface Composition Modulation in Equiatomic Binary Alloys
- Ion Irradiation Induced Surface Composition Modulation in Equiatomic Binary Alloys
- 이광렬; 김병현; 김상필; 강준희; 정용재; 김경석
- Issue Date
- Applied surface science
- VOL 540, 148103
- 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.
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