Plasticization of face-centered metals under electron irradiation

Dubinko, V.I.; Dovbnya, A.; Kushnir, V.A.; Khodak, I.V.; Lebedev, V.P.; Krylovskiy, V. S.; Лебедев, С. В.; Klepikov, V. F.; Ostapchuk, P. N.

doi:10.1134/s1063783412120128

Cited by 11 publications

(14 citation statements)

References 7 publications

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“…The point is that irradiation produces strong lattice excitations (a.k.a. discrete breathers), recently proven to exist in bcc Fe [41,42], and their interaction with dislocations can activate unpinning from structural defects. This may change mechanical properties of materials under reactor conditions as compared to the surveillance specimens in out-reactor tests after equivalent irradiation dose, as has been demonstrated experimentally by Grynik and Karasev [43].…”

Section: Discussionmentioning

confidence: 99%

Temperature dependence of irradiation hardening due to dislocation loops and precipitates in RPV steels and model alloys

Котречко

Dubinko

Stetsenko

et al. 2015

Journal of Nuclear Materials

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A relative contribution to irradiation hardening caused by dislocation loops and solute-rich precipitates is established for RPV steels of WWER-440 and WWER-1000 reactors, based on TEM measurements and mechanical testing at reactor operating temperature of 563 K. The pinning strength factors evaluated for loops and precipitates are shown to be much lower than those obtained for model alloys based on the room temperature testing as well as those evaluated by means of atomistic simulations in the temperature range of 300 to 600 K. This discrepancy is explained in the framework of a model of thermally activated dislocation motion, which takes into account the difference in temperature and strain rate employed in atomistic simulations and in mechanical testing.

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Section: Discussionmentioning

confidence: 99%

Temperature dependence of irradiation hardening due to dislocation loops and precipitates in RPV steels and model alloys

Котречко

Dubinko

Stetsenko

et al. 2015

Journal of Nuclear Materials

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“…They can contribute to the thermal conductivity of crystals . Excitation of DB may be the reason for the yield stress reduction in metals under electron irradiation (). The chemical reaction rate theory has been recently modified for solids to take into account the effect of DB .…”

Section: Possible Applications Of Discrete Breathersmentioning

confidence: 99%

Discrete breathers in 2D and 3D crystals

Chetverikov

Velarde

2015

Physica Status Solidi (b)

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Discrete breathers (DB) are spatially localized, large‐amplitude vibrational modes in defect‐free nonlinear lattices. Recent numerical and experimental studies have confirmed that DB exist in crystals. In the present work, we briefly describe the well‐known existence conditions of DB in crystals and present our recent results on DB in 2D crystals such as graphene and graphane and in 3D crystals such as alkali halide crystals and pure metals. The possible role of DB in solid state physics and materials science is discussed. Stroboscopic picture of atomic motions in the vicinity of discrete breather excited in graphene homogeneously strained with ϵxx=0.3, ϵyy=−0.1. Displacements of atoms from the equilibrium lattice positions are multiplied by the factor 4 for clarity. The discrete breather is of high spatial localization, so that only two atoms oscillate with a large amplitude.

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“…Однако, возникает все больше экспе-риментальных свидетельств того, что механические свойства металлов в процессе облучения отличаются от таковых после облучения [3][4][5][6][7][8][9][10][11][12]. Еще в 60-70-е гг.…”

Section: Introductionunclassified

“…Эффект был обратимым, то есть пластичность увеличилась до исходного уровня после прекращения облучения. В работах [9][10][11] было показа-но, что облучение ГЦК металлов (Al, Al-3Mg, Cu) элек-тронным пучком с энергией 0.5 MeV и плотностью . Предел текучести железа при облучении снизился также как и его устойчивость к разрушению.…”

Section: Introductionunclassified

“…Они имеют частоты выше или ниже фононной зоны; поэтому DB практически не взаимо-действуют с фононами, и их времена жизни велики по сравнению с фононными. В кристаллах с достаточной степенью ангармоничности могут возникать как «сидя-чие» DB (при остывании термических вспышек под об-лучением [10,21] или при рассеянии «горячих» электро-нов на атомах решетки под действием электрического тока [16]), так и мобильные DB -так называемые кву-доны. Квудоны получают энергию и импульс от налета-ющих частиц, и передают их вдоль плотноупакованных кристаллографических направлений с суб-звуковыми скоростями [22,23].…”

Section: Introductionunclassified

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Effect of discrete breathers on plasticity and strength of crystals

Dubinko¹,

Dubinko²,

Дмитриев³

2013

LoM

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Рассмотрены модели взаимодействия дислокаций с дискретными бризерами. Атомные колебания большой амплитуды вызывают модуляцию энергии активации отрыва дислокаций от стопоров, что может значительно ускорять пластическую деформацию в условиях доста-точно высокой концентрации бризеров. Такие условия могут реализоваться при облучении кристаллов бы-стрыми частицами или при достаточно высоких темпе-ратурах. Проведено сравнение моделей с эксперимен-тальными данными для ряда металлов. Обсуждается возможная роль дискретных бризеров в процессе термо-активированного разрушения растянутого графена.Ключевые слова: дискретные бризеры, дислокации, пласти-ческая деформация, графен, разрушение.Models of the dislocation interaction with discrete breathers (DB) are considered. Large amplitude oscillations of atoms about their equilibrium positions in the lattice cause time-periodic modulations of the potential barriers for the dislocation unpinning from obstacles, which can facilitate plastic deformation severely under sufficiently high DB concentration. Such conditions can be realized under irradiation of crystals with swift particles or under sufficiently high temperatures. The models are compared with experimental data on several metals. Possible role of discrete breathers in thermally activated fracture of graphene under tensile load is discussed.

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Plasticization of face-centered metals under electron irradiation

Cited by 11 publications

References 7 publications

Temperature dependence of irradiation hardening due to dislocation loops and precipitates in RPV steels and model alloys

Temperature dependence of irradiation hardening due to dislocation loops and precipitates in RPV steels and model alloys

Discrete breathers in 2D and 3D crystals

Effect of discrete breathers on plasticity and strength of crystals

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