16 April 2018 Microstructure formation on liquid metal surface under pulsed action
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Proceedings Volume 10614, International Conference on Atomic and Molecular Pulsed Lasers XIII; 106140X (2018) https://doi.org/10.1117/12.2303572
Event: XIII International Conference on Atomic and Molecular Pulsed Lasers, 2017, Tomsk, Russia
Abstract
Experimental study and theoretical analysis of growth of microstructures (microtowers) on liquid metals by fs laser pulses have been carried out. Theoretical analysis has been performed on the basis of the two-temperature model. Compared to ns laser pulses, in fs irradiation regimes the heat-affected zone is strongly localized resulting in much larger temperatures and temperature gradients. In the experimental irradiation regimes, the surface temperature of liquid metals studied may reach or even exceed a critical level that culminates in phase explosion or direct atomization of a metal surface layer. However, before explosive ablation starts, a stress wave with an amplitude up to several GPa is formed which demolishes oxide covering. Moreover, at high laser fluences laser-induced breakdown is developed in oxide layer covering the metal surface that leads to destruction/ablation of oxide without damaging metal underneath. An overall scenario of microstructure growth with fs laser pulses is similar to that obtained for ns irradiation regimes though the growth threshold is lower due to smaller heat-conduction losses. Also we managed to obtain microstructures formation by the action of spark discharge.
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D. E. Genin, D. E. Genin, D. V. Beloplotov, D. V. Beloplotov, N. M. Bulgakova, N. M. Bulgakova, A. N. Panchenko, A. N. Panchenko, V. F. Tarasenko, V. F. Tarasenko, } "Microstructure formation on liquid metal surface under pulsed action", Proc. SPIE 10614, International Conference on Atomic and Molecular Pulsed Lasers XIII, 106140X (16 April 2018); doi: 10.1117/12.2303572; https://doi.org/10.1117/12.2303572
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