Abstract
The prethreshold processes on the surface of copper and its alloys are investigated. In the absence of obvious traces of melting, while preserving the metal in a condensed state, under a nanosecond ultraviolet laser radiation energy density of 0.1–1.0 J/cm2, manifestations of high-temperature plastic deformation were observed. These are sliding and cracking along grain boundaries, within which crystallographic slipping was observed. A microprotrusion was formed on the surface of the irradiated zone, which was outwardly similar the distribution of laser radiation in the spot. The height of the microprotrusion reached 1 μm, and sometimes even more. An increase in the number of impacting impulses led to the accumulation of damage. The data obtained are in many ways similar to the acoustoplastic, electroplastic, and magnetoplastic effects. By analogy, we consider it possible to call the discovered effect optoplastic.
Notes
This scientific discovery is listed in the State Register of Discoveries of the USSR under no. 93.
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ACKNOWLEDGMENTS
The authors would like to thank V.Yu. Khomich, Academician of RAS, and V.A. Yamshchikov, Associate Member of RAS, for the useful discussions, as well as S.I. Mikolutsky, Yu.V. Khomich, I.A. Kaplunov, and A.I. Ivanova for the profilograms and electron microscopy of the specimens.
Funding
The work has been performed under the state assignment for scientific activity no. 0057-2019-0005 using the resources of the Common Use Center at Tver State University.
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Malinskiy, T.V., Rogalin, V.E. Prethreshold Effects, when Copper and Its Alloys Were Impacted to Ultraviolet Laser Pulses. Tech. Phys. 68 (Suppl 3), S473–S477 (2023). https://doi.org/10.1134/S1063784223900693
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DOI: https://doi.org/10.1134/S1063784223900693