Irradiation-induced intermixing effects at the interfaces of titanium and titanium-dioxide thin films and Fe-12%Cr substrate

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:386

Article

Mairov, A.¹  Sridharan, K.¹ 

[1] Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA

关键词: Radiation damage;    Thin films;    Intermixing;    Stability;    Ion irradiation;    Interface;   

DOI  :  10.1016/j.nimb.2016.09.012

来源: Elsevier

【 摘 要 】

Irradiation-induced compositional and structural changes at the interfaces between Fe-12%Cr binary alloy substrate and thin films of titanium and titanium-dioxide have been investigated. Irradiations were performed with 5 MeV Ni2+ ions at 300 degrees C and 500 degrees C, up to damage levels of 35 dpa (displacements per atom). For the 300 degrees C irradiation case, irradiation enhanced the interdiffusion coefficient by a factor over twenty for the titanium film samples, but by a factor of only 1.2 for the titanium dioxide film samples. At 500 degrees C, significant intermixing was observed in the titanium film samples and resulted in the formation of a wide Fe2Ti reaction zone. For the titanium dioxide film samples, chromium was observed to diffuse into sub-stoichiometric regions of the film. Irradiation caused the formation of chromium-rich nanoprecipitates within the oxide film and promoted a phase transformation in the film from anatase TiO2 to the Ti2O3 phase. (C) 2016 Elsevier B.V. All rights reserved.

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