PROCEEDINGS OF THE RUSSIAN HIGHER SCHOOL
ACADEMY OF SCIENCES

The paper theoretically and experimentally investigates the influence of laser radiation and high-temperature plasma on changes in the physical properties of amorphous-nanocrystalline materials with nanopores in a thin surface layer. At present, the possibility of simultaneous increase of hardness and resistance to cracking of the material surface because of selective laser action has been experimentally established. Experimental results can be explained based on the model of selective impact of laser radiation on individual nanopores. The physics of laser selective initiation of healing processes of inhomogeneous/defective areas at the nanoscale has been investigated. Using the proposed physical model, the specificity of selective heating of areas near nanopores, as well as the influence of nanoscale defects in the structure on the specificity of isotherm propagation has also been revealed. The process of healing of nanopores located in the inhomogeneously heated surface layer of the material under the action of shock loading is considered. Theoretical results are compared with experimental data. It is shown that as a result of selective laser treatment it is possible to increase microhardness by three-four times, with simultaneous growth of resistance to cracking under conditions of local loading by the Vickers pyramid. The results obtained can be explained within the framework of ideas about selective laser healing of nano- and micro-sized defects located in the surface layer of the material. Thus, the physical and mechanical properties of the surface of condensed materials in an extreme state caused by strong compression under conditions of simultaneous short-term heating to high temperatures have been studied theoretically and experimentally.

1. Abrosimova G. E., Aronin A. S. Morfologiia poverkhnosti deformirovannykh amorfno-nanokristallicheskikh materialov i obrazovanie nanokristallov Poverkhnost' [Surface morphology of deformed amorphous-nanocrystalline materials and formation of nanocrystals]. Rentgenovskie, sinkhrotronnye i neitronnye issledovaniia = Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques, 2018, no. 5, pp. 91–97. DOI: 10.7868/S0207352818050116.
2. Ushakov I.V., Batomunkuev A.Yu. Modelirovanie kompleksa protsessov, protekayushchikh v poverkhnostnykh sloyakh nanostrukturnogo mnogokomponentnogo metallicheskogo splava pod deistviem lazernykh impul'sov [Modelling of complex processes in surface layers of nanostructural many component metallic alloy irradiated by laser impulses]. Vestnik Tambovskogo universiteta. Seriya: Estestvennye i tekhnicheskie nauki = Tambov University Reports. Series: Natural and Technical Sciences, 2016, vol. 21, no. 1, pp. 165–170. DOI: 10.20310/1810-0198-2016-21-1-165-170.
3. Ushakov I.V., Safronov I.S., Oshorov A.D., Wang Z., Muprmtsev D.Yu. Fizika vozdeistviya vysokotemperaturnogo impul'snogo nagreva na defekty v poverkhnostnom sloe metallicheskogo splava [Physics of the effect of high-temperature pulse heating on defects in the surface layer of a metal alloy] Metallurg = Metallurgist, 2023, no. 7, pp. 74–79. (In Russian).
4. Ushakov I.V., Safronov I.S. Vliyanie lazernoi obrabotki na mikrotverdost' i osobennosti razrusheniya tonkikh lent amorfnonanokristallicheskogo metallicheskogo splava [Effect of laser treatment on microhardness and fracture features of thin ribbons of amorphous-nanocrystalline metal alloys]. Fizika i khimiya obrabotki materialov = Physics and Chemistry of Materials Treatment, 2013, no. 2, pp. 11–15.
5. Kaputkin D.E., Duradji V.N., Kaputkina N.A. Uskorennoe diffuzionnoe nasyshchenie poverkhnosti metallov pri elektro-khimiko-termicheskoi obrabotke [Accelerated diffusion saturation of metal surface during electrochemical heat treatment]. Fizika i khimiya obrabotki materialov = Physics and Chemistry of Materials Treatment, 2020, no. 2, pp. 48–57. DOI: 10.30791/0015-3214-2020-2-48-57.
6. Kaputkina L.M., Kaputkin D.E. Structure and phase transformations under quenching and tempering during heat and thermomechanical treatment of steels. Materials Science Forum, 2003, vol. 426–432, pp. 1119–1126. DOI: 10.4028/www.scientific.net/MSF.426-432.1119.
7. Lu Y., Huang G., Wang Y., Li H., Qin Z., Lu X. Crack-free Fe-based amorphous coating synthesized by laser cladding. Materials Letters, 2018, vol. 210, pp. 46–50. DOI: 10.1016/j.matlet.2017.08.125.
8. Simonov Yu.V., Ushakov I.V. . Mekhanicheskie svoistva poverkhnostnykh struktur titanovogo splava VT9 posle mnogokratnoi lokal'noi obrabotki nanosekundnymi lazernymi impul'sami [Mechanical properties of surface structures of titanium alloy BT9 after multiple local processing by nanosecond laser pulses]. Vestnik Moskovskogo gosudarstvennogo oblastnogo universiteta. Seriya: Fizika-matematika = Bulletin of Moscow Region State University. Series: Physics and Mathematics, 2020, no. 2, pp. 19–35. DOI: 10.18384/2310-7251-2020-2-19-35.
9. Sohrabi N., Jhabvala J., Logé R.E. Additive manufacturing of bulk metallic glasses – process, challenges and properties: a review. Metals, 2021, vol. 11 (8), pp. 1279. DOI: 10.3390/met11081279.
10. Betekhtin V.I., Kadomtsev A.G., Larionova T.V., Narykova M.V. Vliyanie termobaricheskogo vozdeistviya na nanoporistost' i svoistva amorfnykh splavov [Effect of thermobaric treatment on the nanoporosity and properties of amorphous alloys]. Metallovedenie i termicheskaya obrabotka metallov = Metal Science and Heat Treatment, 2014, no. 10 (712), pp. 38–42. (In Russian).
11. 11. Wang Z., Ummethala R., Singh N., Tang S., Suryanarayana C., Eckert J., Prashanth K.G. Selective laser melting of aluminum and its alloys. Materials, 2020, vol. 13 (20), p. 4564. DOI: 10.3390/ma13204564.
12. Gladkov S.O., Bogdanova S.B. On the theory of nonlinear thermal conductivity. Technical Physics, 2016, vol. 61 (2), pp. 157–164. DOI: 10.1134/S1063784216020110.