Atomic Movies of Laser-Induced Structural and Phase Transformations from Molecular Dynamics Simulations

Wu, Chengping; Karim, Eaman T.; Volkov, Alexey N.; Zhigilei, Leonid V.

doi:10.1007/978-3-319-02898-9_4

Cited by 13 publications

(14 citation statements)

References 217 publications

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“…There is currently considerable interest to selectively drive phase transformations in solids, with formation of small structures on the solid surface [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Due to the high productivity and versatility of commercial laser sources, laser-induced surface patterning finds diverse applications in the field of technology [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Laser-induced diffusion decomposition in Fe–V thin-film alloys

Polushkin

Duarte

Conde

et al. 2015

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Laser-induced diffusion decomposition in Fe–V thin-film alloys

Polushkin

Duarte

Conde

et al. 2015

Applied Surface Science

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“…We can classify the computational modeling of laser-induced processes into three main categories: the quantum mechanics based (ab initio) electronic structure calculations [58], the classical molecular dynamics (MD) simulations [59,60], and the continuum-level kinetic and hydrodynamic modeling [59]. Each one of these categories is operating at specific length and time scales.…”

Section: Computational Modeling Of Laser-metals Interactionsmentioning

confidence: 99%

“…Several molecular dynamics studies focused on investigation the mechanisms of laser-induced photomechanical spallation suggest that this phenomenon can take place in a wide range of materials and may have similar features in systems as different as molecular solids and metals [24,60,152]. [59]. The snapshots are taken after complete spallation of liquid layers and solidification of the surface regions of the targets.…”

Section: Mechanisms Of Melting Spallation and Phase Explosionmentioning

confidence: 99%

“…The irradiation of metal target by short pulse laser (fs up to 10 ps) has the ability to bring material to a state of strong electronic, thermal, and mechanical non-equilibrium and trigger coupled transient processes that include non-equilibrium energy transport, electron-phonon thermalization, as well as fast non-equilibrium structural and phase transformations that arise from the extreme and dynamic pressure-temperature conditions [59,81]. Generally, with the deposition of the laser energy in the surface region of the irradiated metal targets, the conduction band electrons can be selectively excited.…”

Section: Continuum Modelingmentioning

confidence: 99%

“…[59]. The snapshots are taken after a complete spallation of one liquid layer as well as a complete solidification process of the surface region of the target.…”

mentioning

confidence: 99%

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Atomistic Simulation Study of Short Pulse Laser-Induced Generation of Crystal Defects in Metal Targets

Karim

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AUTHORThe dissertation has been read and approved by the examining committee: Computational analysis reveals a strong correlation between the solidification front velocity and the concentration of vacancies, which in turn suggests that the vacancies are mainly generated at the rapidly advancing solidification front under conditions of strong undercooling below the melting temperature of the target material.The laser-induced generation of dislocations is also observed in the simulations of bcc Cr targets and is found to have a strong dependence on the crystallographic orientation of the target surface. For (001) Cr targets, a transient appearance of small loops of unstable partial dislocations outlining islands of stacking faults takes place at the initial stage of the relaxation of laser-induced stresses. For (110) and (111) Cr targets, the emission of a high density of perfect dislocations from the melting front is observed a few picoseconds after the laser pulse and is related to the high values of the resolved shear stress generated in many of the 48 slip systems of the bcc structure.The computational predictions from this study have implications for optimization of the experimental conditions in current and emerging applications based on short pulse laser-induced surface modification. VIII

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Induced hydrophobicity in micro‐ and nanostructured nickel thin films obtained by ultraviolet pulsed laser treatment

Carpeño

Dickinson

Seal

et al. 2016

Physica Status Solidi (a)

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Abstractauthoren Nickel thin films were deposited on Ti6Al4V and surface treated with nanosecond pulse ultraviolet laser in ambient conditions using a fluence of 3.68 J cm−2. A twofold to threefold increase in contact angle was observed for water, ethylene glycol, and diiodomethane following laser treatment, with recorded contact angles for water in excess of 130°. No additional treatment was used to hydrophobize the surface. Three different micro‐ and nanometric levels of roughness were generated on the thin film surface, which can be related to the rastering parameters of the laser and to the increase in apparent contact angle. Melt droplets were identified as a main contribution to the nanometric roughness level, indicating that melting and melt ejection play an important role in surface nanostructuring. Micro‐ and nanopatterning obtained after UV laser treatment of nickel thin films, highlighting the different scales of the generated features.

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Atomic Movies of Laser-Induced Structural and Phase Transformations from Molecular Dynamics Simulations

Cited by 13 publications

References 217 publications

Laser-induced diffusion decomposition in Fe–V thin-film alloys

Laser-induced diffusion decomposition in Fe–V thin-film alloys

Atomistic Simulation Study of Short Pulse Laser-Induced Generation of Crystal Defects in Metal Targets

Induced hydrophobicity in micro‐ and nanostructured nickel thin films obtained by ultraviolet pulsed laser treatment

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