Equilibrium and highly nonequilibrium states of condensed matter (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 21 April 2008)

Ovchinnikov, V. V.; Муртазаев, А. К.; Хазанов, Е. А.; Сергеев, А. М.

doi:10.1070/pu2008v051n09abeh006795

Cited by 57 publications

(38 citation statements)

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“…В ряде работ показано, что ударные волны могут влиять на процессы самодиффузии в ГЦК кристаллах [11], вызывать укрупнение вакансионных пор [12,13], а так же участвовать в ряде других процессов [14,15].…”

Section: Introductionunclassified

Simulation of the shock waves propagation through the interface of bipartite bimetallic Ni-Al particles

Zakharov¹,

Полетаев²,

Старостенков³

et al. 2017

LoM

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By means of molecular dynamics method, structural changes in Ni-Al bimetal particles during the propagation of shock waves were studied. A possibility of pore formation near the interface between the metals was established. It was found that determining factors of the pore formation near a Ni-Al interface were the mutual orientation of the metals, their size and the direction of a shock wave propagation. Two directions of the shock wave propagation were considered. In the first case, the wave was initiated on the Ni side. If the direction of the wave motion coincides with the close-packed direction in the crystal, detachment of a part of the atoms from the Al surface with a subsequent formation of clusters of these atoms was possible. In this case, the surface attained a typical shape with a dimple in the center of the particle. If the shock wave propagates along a not close-packed direction, the main part of its energy dissipated near the metal interface and led to the formation of pore nuclei. The formation of the pores depended mainly on the bimetal particle size. The dependence of the maximum pore size on the linear dimensions of the Ni-Al bipartite bimetal particles was calculated. Time evolution of the pores was studied. In the second case, the shock wave was initiated from the Al side. Similar effects were obtained. However, the pores were formed on the Al but and not on the Ni side. Such a location of the pores was due to a lower binding energy between Al-Al atoms than between Ni-Ni and Ni-Al ones. When the shock wave passed along close-packed directions, the energy was not sufficient to detach the atoms from the Ni side and form clusters of them.Keywords: bimetal, shock wave, pore, fcc crystal, misfit dislocation. Моделирование прохождения ударных волн через границу раздела двудольных биметаллических частиц Ni-AlЗахаров П. В. Методом молекулярной динамики изучены структурные изменения частиц биметаллов Ni-Al при прохождении ударных волн. Показана возможность формирования зародышей пор вблизи поверхности раздела металлов. Уста-новлено, что определяющими факторами формирования зародышей пор вблизи границы раздела Ni-Al являются взаимная ориентация металлов, их размер и направление прохождения ударной волны. Рассмотрены два направ-ления прохождения ударной волны. В первом случае волна инициировалась на стороне Ni. Если направление дви-жения волны совпадало с плотноупакованным направлением в кристалле, то был возможен отрыв части атомов с поверхности Al с последующим формированием из них кластеров. Поверхность приобретала характерную форму с углублением в центре частицы. В случае распространения ударной волны вдоль не плотноупакованного направ-ления, основная часть энергии рассеивалась вблизи границы раздела металлов и приводила к формированию заро-дышей пор. Формирование пор в большей степени зависело от размеров частиц биметалла. Рассчитана зависимость максимального размера пор от линейных размеров частиц двудольного биметалла Ni-Al. Рассмотрена эволюция пор с течением времени. Во втором случае ударная во...

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Section: Introductionunclassified

Simulation of the shock waves propagation through the interface of bipartite bimetallic Ni-Al particles

Zakharov¹,

Полетаев²,

Старостенков³

et al. 2017

LoM

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“…In particular, it was established in our works studying the influence that ion beams have on the structure and properties of various metastable media [10,14] that under certain circumstances ion bombardment can be an alternative to furnace annealing. Radiation annealing in alloys occurs at significantly lower temperatures (by 150-200 K) and energy consumption, and this process takes less time, as compared with isothermal furnace annealing.…”

Section: Introductionmentioning

confidence: 99%

“…These effects are caused by the generation of nanosized post-cascade shock waves (during evolution of dense cascades of atomic collisions) and propagation of these waves in a medium rather than by the doping of thin surface layers and the formation of radiation defects in them. These waves can initiate the plastic flow of the material on their front and phase transformations that are similar to combustion and detonation phenomena; because of this, changes in the structure and properties can be observed at the submillimeter and millimeter depths [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Examples of the successful use of accelerated ion beams in industrial processes to modify the electrical, magnetic, mechanical, contact-chemical, and other material properties have emerged in recent years [1][2][3][4][5][6][7][8][9][10]. A number of technological ion sources [2,11,12] capable of generating ion beams of various chemical elements with energies from a few to several tens of keV are developed and successfully used in manufacture.…”

Section: Introductionmentioning

confidence: 99%

“…However, all these attempts to use high-energy ions (> 10 MeV) and powerful ion beams in order to increase the ion penetration depth deeper than several tens of micrometers, which is not sufficient for a great number of commercial applications, have failed. The use of radiation-dynamic long-range effects [7][8][9][10] increases substantially the depth of the modified zone under ion-beam processing. These effects are caused by the generation of nanosized post-cascade shock waves (during evolution of dense cascades of atomic collisions) and propagation of these waves in a medium rather than by the doping of thin surface layers and the formation of radiation defects in them.…”

Section: Introductionmentioning

confidence: 99%

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Effect of ion beam treatment (Ar⁺, E = 30 keV) on the microstructure of titanium alloys

Гущина

Ovchinnikov

Makhin’ko

et al. 2017

J. Phys.: Conf. Ser.

Self Cite

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Abstract. The effect of continuous Ar + ion beams (E = 30 keV, j = 400 μA/cm 2 ; F = 5·10 16 cm -2 ) on the hardness and microstructure of the Gr2-titanium-based and Ti-6Al-4V alloys after cold working and subsequent recrystallization annealing is studied. It has been found that the initial microstructure of the annealed alloys in the equilibrium state, which consisted of recrystallized equiaxed grains, does not change after irradiation; thus the hardness of the irradiated samples is comparable with that of the initial samples. The initial fine fiber structure of the deformed Ti-6Al-4V alloy changes insignificantly after both annealing (Т = 790°С, 30 min) and ion irradiation under used conditions. In contrast to that, the effect of rapid radiation annealing of the cold-worked titanium Gr2 alloy with beams of accelerated ions of inert gas at low temperatures (lower by 130°C than the conventional annealing temperature of these alloys at 680°С) and for a shorter time (9 min instead of 35 min, τirr ~ 20 s) has been revealed. The result is the formation of a uniform recrystallized structure with equiaxed fine grains 5-10 μm in size in the entire volume of the 3-mm-thick samples, despite the fact that the average projected range of 30-keV Ar + ions in titanium is only 20 nm.

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On the mechanisms of radiation damage and prospects of their suppression in complex metal oxides

Lushchik

Nagirnyi

et al. 2013

Physica Status Solidi (b)

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The influence of some impurity ions on the increase/decrease in the resistance against irradiation of metal oxides with X‐rays and electrons (low‐dense excitation) or ∼2 GeV Au198 and U238 ions providing a superhigh density of electronic excitations along cylindrical tracks (LET > 30 keV nm−1) has been investigated for fcc MgO single crystals with close ion masses or Lu3Al5O12 and Gd2SiO5 with large unit cells and heavy cations. The radiation effects have been studied using the methods of low‐temperature vacuum ultraviolet spectroscopy (up to 40 eV), cathodoluminescence and thermoactivation spectroscopy. The step‐by‐step annealing of the radiation‐induced absorption, scattering, and luminescence has been performed at the heating of irradiated crystals up to ∼70% of a melting point. Possible experimental manifestations of the temperature‐stable nanosize 3D defects created, according to theoretical predictions, via rearrangement of many host ions at the collapse of discrete solitons (breathers) are detected in Lu3Al5O12 and Gd2SiO5 crystals irradiated with swift heavy ions (fluence of 1012 ions cm−2).

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Equilibrium and highly nonequilibrium states of condensed matter (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 21 April 2008)

Cited by 57 publications

References 0 publications

Simulation of the shock waves propagation through the interface of bipartite bimetallic Ni-Al particles

Simulation of the shock waves propagation through the interface of bipartite bimetallic Ni-Al particles

Effect of ion beam treatment (Ar⁺, E = 30 keV) on the microstructure of titanium alloys

On the mechanisms of radiation damage and prospects of their suppression in complex metal oxides

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Equilibrium and highly nonequilibrium states of condensed matter (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 21 April 2008)

Cited by 57 publications

References 0 publications

Simulation of the shock waves propagation through the interface of bipartite bimetallic Ni-Al particles

Simulation of the shock waves propagation through the interface of bipartite bimetallic Ni-Al particles

Effect of ion beam treatment (Ar+, E = 30 keV) on the microstructure of titanium alloys

On the mechanisms of radiation damage and prospects of their suppression in complex metal oxides

Contact Info

Product

Resources

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Effect of ion beam treatment (Ar⁺, E = 30 keV) on the microstructure of titanium alloys