Phase separation and dynamic patterning in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>films under ion irradiation

Krasnochtchekov, P.; Averback, Robert S; Bellon, Pascal

doi:10.1103/physrevb.72.174102

Cited by 41 publications

(25 citation statements)

References 22 publications

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“…Continuum models and atomistic simulations predict that when R b exceeds a critical value R c compositional patterns become stable for a range of forcing intensities around γ b ≈ 1 [6][7][8][9]. These predictions are in good agreement with the compositional patterning reported in several immiscible alloys subjected to ion irradiation, including several Cu-base alloys such as Cu-Ag, Cu-Co, Cu-Fe [10][11][12][13].…”

Section: Introductionsupporting

confidence: 73%

Novel mechanism for order patterning in alloys driven by irradiation

2017

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Abstract:Kinetic Monte Carlo simulations have been performed to investigate the evolution of ordered domains in model alloys under irradiation. The alloys investigated were equiatomic binary alloys on a simple square lattice with first and second nearest-neighbor interactions, chosen so that a 2×2 ordered structure is the equilibrium phase below a critical order-disorder transition temperature, T c . The ratio of second to first nearest neighbor interactions, R was varied from 0 to 0.45 to explore the effect of the thermodynamic frustrations induced by the proximity of the 2×1 phase boundary, which occurs at R = 0.5 for T = 0. The atomic mixing produced by nuclear collisions was modeled by forcing the ballistic exchange of pairs of atoms at a controlled rate, Γ b . This disordering process competed with thermodynamic re-ordering, resulting in nonequilibrium steady states. Two trivial steady states were found, a disordered state at high

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Section: Introductionsupporting

confidence: 73%

Novel mechanism for order patterning in alloys driven by irradiation

2017

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“…Ion-induced phase separation has been observed as volume effect, e.g., in binary metal alloys [30][31][32] and was attributed to metal nanocrystal formation at Si/SiO 2 interfaces [33], in Pt/C layered films [34], ion irradiated C/Cr coatings [35], and ion irradiated GeO x films [36]. Compositional patterning of metallic alloys due to phase separation was studied with kinetic Monte Carlo simulations [30,37,38].…”

Section: Introductionmentioning

confidence: 99%

The role of phase separation for self-organized surface pattern formation by ion beam erosion and metal atom co-deposition

et al. 2012

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We investigate the ripple pattern formation on Si surfaces at room temperature during normal incidence ion beam erosion under simultaneous deposition of different metallic co-deposited surfactant atoms. The co-deposition of small amounts of metallic atoms, in particular Fe and Mo, is known to have a tremendous impact on the evolution of nanoscale surface patterns on Si. In previous work on ion erosion of Si during co-deposition of Fe atoms, we proposed that chemical interactions between Fe and Si atoms of the steady-state mixed Fe x Si surface layer formed during ion beam erosion is a dominant driving force for self-organized pattern formation. In particular, we provided experimental evidence for the formation of amorphous iron disilicide. To confirm and generalize such chemical effects on the pattern formation, in particular the tendency for phase separation, we have now irradiated Si surfaces with normal incidence 5 keV Xe ions under simultaneous gracing incidence co-deposition of Fe, Ni, Cu, Mo, W, Pt, and Au surfactant atoms. The selected metals in the two groups (Fe, Ni, Cu) and (W, Pt, Au) are very similar regarding their collision cascade behavior, but strongly differ regarding their tendency to silicide formation. We find pronounced ripple pattern formation only for those co deposited metals (Fe, Mo, Ni, W, and Pt), which are prone to the formation of mono and disilicides. In contrast, for Cu and Au co-deposition the surface remains very flat, even after irradiation at high ion fluence. Because of the very different behavior of Cu compared to Fe, Ni and Au compared to W, Pt, phase separation toward amorphous metal silicide phases is seen as the relevant pro-

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“…Було показано, що саме середня дов-жина стрибка R є основною характеристикою конкуруючих реак-цій в опромінюваних стопах, що призводить до процесів самоорга-нізації мікроструктури стопів [8]. Експериментально вплив серед-ньої довжини стрибка на утворення структур розглянуто при дослі-дженні тонких плівок Au-Cu [13] і Cu-Co [14].…”

Section: мікроструктурні перетворення в об'ємі матеріялівunclassified

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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Phase separation and dynamic patterning inCu1−xCoxfilms under ion irradiation

Cited by 41 publications

References 22 publications

Novel mechanism for order patterning in alloys driven by irradiation

Novel mechanism for order patterning in alloys driven by irradiation

The role of phase separation for self-organized surface pattern formation by ion beam erosion and metal atom co-deposition

Modelling of Microstructural Transformations in the Systems Subject to Radiation Influence

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