Laser-induced surface alloying in nanosized Ni/Ti multilayer structures
| Autor: | Janez Kovač, Milan S. Trtica, Suzana Petrović, Davor Peruško, Miodrag Mitrić, Bojan B. Radak, Primož Pelicon, Biljana M. Gaković |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Scanning electron microscope Alloy Analytical chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology engineering.material Ripple structure 01 natural sciences Fluence law.invention Diffusion law 0103 physical sciences Thin film 010302 applied physics Auger electron spectroscopy Ni/Ti multilayer Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Rutherford backscattering spectrometry Laser Surfaces Coatings and Films Crystallography chemistry engineering Laser alloying 0210 nano-technology Surface segregation Titanium |
| Zdroj: | Applied Surface Science |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2012.10.012 |
| Popis: | Laser-induced alloying effects on the composition and structure of different Ni/Ti multilayer structures were studied. Thin films composed of one, five, and ten (Ni/Ti) bilayers were deposited by DC ion sputtering on (1 0 0) Si wafers. Laser irradiations were performed by 150 ps pulses of a Nd:YAG laser operating at 1064 nm. The samples were characterized by Rutherford backscattering spectrometry (RBS), Auger electron spectroscopy (AES), X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM). At a laser fluence of 0.9 J cm(-2), interaction between Ni and Ti layers was initiated, and NiTi alloy formed in 5- and 10-bilayered samples. Progressed alloying was achieved at a laser fluence of 1.2 J cm(-2). The alloy was formed mostly within the heat affected zone (HAZ) of the sample. Surface segregation of titanium was followed by formation of a 25 nm thin TiO2 film on the surface of the multilayered structures. In addition, parallel periodic surface structures on the surfaces of the 5- and 10-bilayered samples were clearly recorded. Their period in the case of the 5-bilayered system (0.77 mu m) agrees very well with the predictions of the common theory, whereas, in the case of the 10-bilayered system, two periods of such structures are observed (1.43 mu m and 0.4 mu m), and none of them coincides with the prediction. (C) 2012 Elsevier B. V. All rights reserved. |
| Databáze: | OpenAIRE |
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