Phase separation in binary systems with competing internal and external multiplicative noises

Kharchenko, D. O.; Lysenko, Irina O.; Kokhan, S.V.

doi:10.1140/epjb/e2010-00172-8

Cited by 16 publications

(21 citation statements)

References 32 publications

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“…Цікавим питанням є дослідження нерівноважних процесів фазово-го розшарування у конденсованих бінарних системах еквіатомового складу (бінарні стопи) під дією опромінення [82,83]. Для цього, за-звичай, використовується відомий модель Кана-Хілліярда-Кука [1, 84,85].…”

Section: особливості фазового розшарування бінарних систем під дією оunclassified

Modelling of Microstructural Transformations in the Systems Subject to Radiation Influence

2012

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Розвинуто формалізм для послідовного опису мікроструктурних перетво-рень і фазового розшарування у системах, що перебувають у сильно нерів-новажних умовах, викликаних дією опромінення. Аналізу проведено в ра-мках методи фазового поля кристалу, що дає змогу проводити дослідження на просторових масштабах молекулярної динаміки, однак на часових інте-рвалах дифузійної динаміки. Виявлено умови перебігу мікроструктурних перетворень у періодичних однокомпонентних системах кристалічного ти-пу за наявности конкурувальних стохастичних потоків: термічно стиму-льованого та балістичного перемішування атомів. Аналізою поведінки сис-тем на більш високому ієрархічному рівні для бінарних систем еквіатомо-вого складу встановлено реверсивний характер перебігу процесу фазового розшарування. Для систем із несумірними часовими масштабами розпо-всюдження збурень, що характеризуються ефектами пам'яті, виявлено присутність процесів відбору структур за наявности флюктуацій довжин стрибків атомів, вибитих високоенергетичними частинками.Formalism is developed for description of microstructure transformations and phase separation in systems under irradiation. Investigation is made within the scope of the crystal phase-field method. This approach allows one to simulate materials on the molecular-dynamics spatial scales but on the diffusivedynamics temporal scales. Considering a model for a periodic one-component system driven by both competing stochastic fluxes-thermally-stimulated and external ballistic mixing flues of atoms, conditions of microstructuretransformations' appearance are determined. Analysis of the system on a mesoscopic level for a binary equiatomic system is performed. Reentrant character of phase-separation process is revealed. For systems with transient dynamics, for instance, with incommensurable time scales of propagation of disturbances, which are characterized by the memory effects, at presence of fluc- Fiz. Met. 2012, т. 13, сс. 101-187 Оттиски доступны непосредственно от издателя Фотокопирование разрешено только в соответствии с лицензией © 2012 ИМФ (Институт металлофизики им. Г. В. Курдюмова НАН Украины) Напечатано в Украине.

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Section: особливості фазового розшарування бінарних систем під дією оunclassified

Modelling of Microstructural Transformations in the Systems Subject to Radiation Influence

2012

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“…[36,44]). Therefore, the quantity J can be decomposed to have both regular (deterministic) and stochastic addenda, J = J + J .…”

Section: Modelmentioning

confidence: 99%

“…The influence of the athermal ballistic mixing on the behavior of dissipative binary systems (τ D → 0) undergoing a spinodal decomposition was studied in Ref. [44]. The corresponding external noise induced patterning in onecomponent periodic systems with conserved dynamics and τ D → 0 was discussed in Ref.…”

Section: Modelmentioning

confidence: 99%

Pattern selection processes and noise induced pattern-forming transitions in periodic systems with transient dynamics

Kharchenko

Lysenko

2011

Open Physics

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Abstract:We apply the phase field crystal method for nonequilibrium patterning to stochastic systems with an external source in which transient dynamics is essential. Considering a prototype model for a one-component periodic system subjected to external influence kind of irradiation we study properties of pattern selection processes and external noise induced pattern-forming transitions. These processes are examined by means of the structure function dynamics analysis. Nonequilibrium pattern-forming transitions are analyzed numerically. PACS

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“…A particle irradiation producing structural disorder and point defects rearrangement leads to hardening, swelling and embrittlement of materials. Understanding microstructure evolution and mechanisms governing rearrangement of defects generated at irradiation remains an actual problem in modern material science and, generally, in physics of nonequilibrium phenomena [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…This model of the ballistic mixing was proposed in Ref. [32] and effectively used to study pattern formation in crystalline one-component systems and phase separation processes in binary systems under sustained irradiation [8,9,[33][34][35][36][37]. In our study we consider two cases of constant rate mechanical loading: (i) shear strain and (ii) cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Modeling microstructure evolution of binary systems subjected to irradiation and mechanical loading

Kharchenko

Shchokotova

Lysenko

et al. 2015

Radiation Effects and Defects in Solids

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We study a change in mechanical properties of binary systems subjected to irradiation influence described by ballistic flux of atomic mixing having regular and stochastic contributions. By using numerical modeling based on the phase field approach we study dynamics of deformation fields in a previously irradiated system and in the binary system deformed during irradiation. An influence of both deterministic and stochastic components of ballistic flux onto both yield strength and ultimate strength is studied. We have found that degradation of mechanical properties relates to the formation of percolating clusters of shear bands. Considering a hardening coefficient we analyze stages of plastic deformation of both initially irradiated alloy and alloy subjected to sustained irradiation. Stability of binary alloy under mechanical loading in the form of shear strain with a constant rate and cyclic deformation is discussed.

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Phase separation in binary systems with competing internal and external multiplicative noises

Cited by 16 publications

References 32 publications

Modelling of Microstructural Transformations in the Systems Subject to Radiation Influence

Modelling of Microstructural Transformations in the Systems Subject to Radiation Influence

Pattern selection processes and noise induced pattern-forming transitions in periodic systems with transient dynamics

Modeling microstructure evolution of binary systems subjected to irradiation and mechanical loading

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