Nanostructured surfaces

Formation of laser induced periodic surface structure on amorphous metallic alloy.
Nykyruy Yu.1, Mudry S.1, Shtablavyi I.1, Gnilitskyi I.2,3 
1 Metal Physics Department, Ivan Franko National University of Lviv, Kyrylo and Mephodiy str. 8, Lviv 79005, Ukraine.
 E-mail: yuliya.nykyruy@lnu.edu.ua
2 NoviNano Lab LLC, Pasternaka 5, 79015 Lviv, Ukraine
3 Department of Photonics, Lviv Polytechnic National University, Stepana Bandery 14, 79000, Lviv, Ukraine

Amorphous metallic alloys (AMA) are interesting for research and manufacturing due to unique properties caused by their disordered metastable structure, such as high strength and elasticity, good corrosion resistance, excellent soft magnetic properties. Using laser irradiation it is possible to controllably change the structure and hence the properties of the alloy [1, 2]. Short-pulse laser irradiation affects only a thin surface layer of AMA. In [3] it was shown that a femtosecond pulse laser allows forming the laser induced periodic surface structure (LIPSS) on crystalline materials that can significantly change its properties, such as tribological, optical, wettability. The origin of LIPSS on crystalline materials was discussed in [4]. Besides, it is of great interest LIPSS formation on AMA. Combining properties caused by amorphous structure and properties caused by LIPSS seems to be very perspective for practical usage.
We used the femtosecond pulse laser for nanostructuring Fe73.5Nb3Cu1Si15.5B7 AMA surface. The formation of highly regular LIPSS was achieved and the optimal parameters of laser irradiation, resulted in LIPSS formation, were found. The alloy was studied using the X-Ray diffraction and SEM methods.

1.  Nykyruy Yu. S. Mudry S. I. Effect of laser irradiation on the structure of IRON-based amorphous alloys. In Maryann C. Wythers (Ed.) Advances in Materials Science Research. Volume 40., Nova Science Publishers, NY, 2020.
2.  Mudry S.I., Nikirui Y.S., Borisyuk, A.K. Effect of laser processing on the structure and magnetic characteristics of an amorphous Fe73.5Nb3Cu1Si15.5B7 alloy. // Inorg. Mater. – 2014. – 50(4), - P. 358–364. 
3.  Gnilitskyi, I.; Rota, A.; Gualtieri, E.; Valeri, S.; Orazi, L. Tribological properties of high-speed uniform femtosecond laser patterning on stainless steel. // Lubricants – 2019,– 7, - P. 83.
4.  Gnilitskyi, I, Derrien, T.J, Levy, Y. et al. High-speed manufacturing of highly regular femtosecond laser-induced periodic surface structures: physical origin of regularity // Sci.Rep.–2017.–7, – P. 8485