Effect of intensity modulation on radiation-induced melting and vaporization of solids

Korotchenko, A. I.; Samokhin, A. A.; Guskov, Alex

doi:10.1007/bf00615814

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…(7) After the described initial period, extra factors that play a definitive role in the amplification of the surface profile inhomogeneities must be added to the model. Among these, at least two thoroughly discussed in the literature should be allowed for-redistribution of the radiation flow [1,15] and the surface tension of the melt [11].…”

Section: Discussionmentioning

confidence: 99%

Two-component finite-volume scheme for modelling the initial stage of Al₂O₃-TiC laser processing

Utkin¹,

Oliveira²,

Vilar³

2001

Modelling Simul. Mater. Sci. Eng.

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Processing Al2O3-TiC ceramics with excimer laser radiation is accompanied by the formation of columnar structures that significantly increase the surface roughness. Once nucleated, the surface structures may grow towards the direction of laser beam propagation because the radiation is reflected from the lateral column sides and concentrates between columns. The origin of the column nucleators is the subject of controversial theories, involving mechanisms from Raleigh-Taylor hydrodynamic instability to capillary waves. We demonstrate that, for the case of initially inhomogeneous ceramic microstructures, nucleator development may be described by conventional fluid-dynamics phenomena. With a simple finite-difference scheme (incorporating the conservation equations for alumina and titanium carbide masses, momentum and internal energy) we trace the evolution of a single cylindrical TiC grain at the surface of an alumina matrix. Though the fusion temperature of TiC is higher than that of Al2O3, melting starts with titanium carbide: due to its much higher absorptivity, radiation is absorbed in an extremely thin upper layer of the TiC grain, which is heated up and melted nearly instantly. The melting of TiC is accompanied by expansion, with the tendency for small surface swellings to form a surface globule similar to those observed experimentally.

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Section: Discussionmentioning

confidence: 99%

Two-component finite-volume scheme for modelling the initial stage of Al₂O₃-TiC laser processing

Utkin¹,

Oliveira²,

Vilar³

2001

Modelling Simul. Mater. Sci. Eng.

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Hydrodynamic Perturbations in Radiation-Induced Vaporization of Metals

Korotchenko

Popov

Samokhin

et al. 1984

Gas Flow and Chemical Lasers

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Mechanisms of melt droplets and solid-particle ejection from a target surface by pulsed laser action

1995

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Effect of intensity modulation on radiation-induced melting and vaporization of solids

Cited by 4 publications

References 14 publications

Two-component finite-volume scheme for modelling the initial stage of Al₂O₃-TiC laser processing

Two-component finite-volume scheme for modelling the initial stage of Al₂O₃-TiC laser processing

Hydrodynamic Perturbations in Radiation-Induced Vaporization of Metals

Mechanisms of melt droplets and solid-particle ejection from a target surface by pulsed laser action

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Effect of intensity modulation on radiation-induced melting and vaporization of solids

Cited by 4 publications

References 14 publications

Two-component finite-volume scheme for modelling the initial stage of Al2O3-TiC laser processing

Two-component finite-volume scheme for modelling the initial stage of Al2O3-TiC laser processing

Hydrodynamic Perturbations in Radiation-Induced Vaporization of Metals

Mechanisms of melt droplets and solid-particle ejection from a target surface by pulsed laser action

Contact Info

Product

Resources

About

Two-component finite-volume scheme for modelling the initial stage of Al₂O₃-TiC laser processing

Two-component finite-volume scheme for modelling the initial stage of Al₂O₃-TiC laser processing