Dislocation Mass-Transfer and Electrical Phenomena in Metals under Pulsed Laser Influence

Filatov, A. V.; Pogorelov, A. E.; Kropachev, D.; Dmitrichenko, O.

doi:10.4028/www.scientific.net/ddf.363.173

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…In the process of laser action between a nonmetallic inclusion and a steel matrix, a high-speed exchange of atoms occurs through the interface under conditions of an abnormal high mobility of the atoms that does not meet the conditions of classical diffusion (abnormal mass transfer) [12][13][14][15]. The processes of mass transfer during laser exposure are facilitated by the following factors: heating to high temperatures and high-speed movement of the defects in the crystal structure that occur during thermal shock; the possibility of formation of a thermally nonequilibrium plasma; the appearance of convective and wave flows in the melt [16]; relaxation of thermoplastic stresses arising during irradiation; melting; electronic and electromagnetic interaction of inclusions and matrix [17]; formation in the surface areas of the inclusions of zones with an increased density of dislocations [7,18].…”

Section: Resalts and Discussionmentioning

confidence: 99%

About Wave Nature of the Formation of Gradient and Microcomposite Zones Near Non-Metallic Inclusions During Laser Processing of the Steels

Губенко¹

2023

J. Mater. Sci. Technol. Res.

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The goal of this investigation was to research the wave nature of the formation of gradient and composite zones near non-metallic inclusions during laser treatment of the steels. The materials for investigation were commercial steels containing different non-metallic inclusions. The specimens of different steels were exposed to laser beaming on the installations GOS-30M. The research methods were applied: petrography, X-ray microscopy (MS-46 Cameca, "Nanolab - 7") and optical microscopy (Neophot-31) to study steel matrix near non-metallic inclusions and to identify of the inclusions. Nanohardness of the steel matrix near inclusions ("Nano Indenter II") was analyzed. Peculiarities of wave saturation of the steel matrix by chemical elements of non-metallic inclusions during laser action were investigated. It was shown the role of wave relaxation of stresses in the formation of cascade type structure of steel matrix near non-metallic inclusions. The features of the formation of gradient and micro composite saturation zones of cascade type in a steel matrix under conditions of abnormal mass transfer from nonmetallic inclusions during laser processing are discussed. It has been established that the formation of gradient saturation zones with a cascade and “spot” distribution of elements and nanohardness is due to the wave nature of the relaxation of thermal and deformation stresses near non-metallic inclusions at the time of laser exposure. The difference in the rates of abnormal mass transfer of chemical elements of non-metallic inclusions into a steel matrix at the moment of laser melting is shown, which is associated with different solubility and mobility of the atoms of alloying elements in liquid iron.

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Section: Resalts and Discussionmentioning

confidence: 99%

About Wave Nature of the Formation of Gradient and Microcomposite Zones Near Non-Metallic Inclusions During Laser Processing of the Steels

Губенко¹

2023

J. Mater. Sci. Technol. Res.

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“…As shown, the surface alloying takes place by iron cladding on the aluminium-based specimen in the process of ultrasonic impact loading [4]. Impact treatment provides defect formation and atom migration on the phase interface and those atom-transfer processes are mechanically activated, as mechanical activated diffusion described in [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Diffusion-Zone Formation at the Al–Fe Phase Interface under Impact-Loading Conditions

Soldatenko¹,

Filatov²,

Mordyuk³

et al. 2023

Metallofiz. Noveishie Tekhnol.

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A molecular dynamics study in combination with experimental research is applied for investigation of diffusion-zone formation on the phase interface between aluminium-based alloy Д16 (2024) and Fe-alloyed layer on its surface formed in the process of ultrasonic impact treatment (UIT) of Д16 alloy by Armco-iron pin. The formation of surface-layer structure, its thickening and diffusion zone formation between base material and alloyed layer is studied by scanning electron microscopy and energy-dispersive x-ray spectroscopic analysis of cross-section of treated samples. In the UIT process, the microstructure in the surface layer becomes finely fragmented and the diffusion zone becomes thicker with increasing of UIT duration. The molecular dynamics simulation is applied to investigate atom behaviour on the phase interface between Al-and Fe-layers, to observe defect formation and its migration in the process of impact loading, which contributes to the formation of diffusion zone and restructuring of near-phase interface layers.

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“…Occurrence of enhanced mass transfer due to non-equilibrium conditions under pulsed deformations in the elastic as well as plastic range has been observed during mechanochemical thermal treatment of the following types: ultrasonic, laser, electro-hydropulses, pulsed magnetic fields, electrical discharge, deformations during reversible structural changes of martensite, and several other sorts of pulsed strain [9][10][11]. External energy influences at high levels including periodic laser pulses [12,13] significantly increase the mobility of atoms in alloys and metals of solid phase. Non-stationary deformation limited to a local zone of the material is a necessary prerequisite for the occurrence of a general thermodynamic force effectuating rapid mass transfer [14].…”

Section: Introductionmentioning

confidence: 99%

“…Figure13. Graphical images of samples on which were displayed the magnitudes of the vibration rate at every point of the sample with time intervals of a quarter of the oscillation cycle, obtained using PSV Presentation software that correspond to the frequencies of the sound range: 100 Hz (a), 200 Hz (b) and 300 Hz (c)[81].…”

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confidence: 99%

Laser Irradiation for Enhancing Mass Transfer in the Solid Phase of Metallic Materials

Murzin

2021

Metals

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Possibilities of using laser irradiation to enhance mass transfer in the solid phase of metallic materials in order to form structures with improved physical and mechanical properties were reviewed. The features of the diffusion mass transfer in metals and alloys under shock exposure were specified. In this case, the rate of diffusion processes of mass transfer can be significantly increased. The conditions for intensification of mass transfer in metallic materials by pulse-periodic laser irradiation were determined and the synthesis of nanoporous and composite oxide nanomaterials was described. A significant increase of the diffusion coefficient in a metallic material, in comparison to plain exposure to laser beam heating, was identified. It could be attributed to the synergy of heat exposure and laser-induced vibrations, mainly in the range of sound frequencies, as a result of a pulse-periodic laser irradiation. The condition for intensifying mass transfer in the solid phase of selectively oxidable metallic materials was identified as a non-stationary stress-strain state caused by laser-induced sound waves. The exploitation of this synergy effect permitted the implementation of a novel approach for the creation of structures of nanomaterials. At the same time, a targeted influence on mass transfer and the accompanying relaxation processes make it possible to achieve an increase in the efficiency of methods for processing metals and alloys.

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Dislocation Mass-Transfer and Electrical Phenomena in Metals under Pulsed Laser Influence

Cited by 8 publications

References 6 publications

About Wave Nature of the Formation of Gradient and Microcomposite Zones Near Non-Metallic Inclusions During Laser Processing of the Steels

About Wave Nature of the Formation of Gradient and Microcomposite Zones Near Non-Metallic Inclusions During Laser Processing of the Steels

Mechanism of Diffusion-Zone Formation at the Al–Fe Phase Interface under Impact-Loading Conditions

Laser Irradiation for Enhancing Mass Transfer in the Solid Phase of Metallic Materials

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