Anisotropy migration of self-point defects in dislocation stress fields in BCC Fe and FCC Cu

Sivak, A.B.; Чернов, В. М.; Dubasova, N.A.; Романов, В. А.

doi:10.1016/j.jnucmat.2007.03.134

Cited by 21 publications

(16 citation statements)

References 6 publications

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“…Рассчитанные МС-методом энергетические и кристаллографические характеристики СТД (упругих диполей, определяемых дипольным тензором P ij ) в стабильных и метастабильных конфигурациях в кри-сталлических решётках Fe и V без напряжений приведены в [3,5,6,11].…”

Section: энергетические и кристаллографические характеристики стдunclassified

“…Анизотропия миграции СТД в поле механических напряжений определяется взаимодействием СТД в седловой конфигурации с упру-гим полем [3][4][5][6][7]. Энергию взаимодействия E int упругих полей МГН с СТД (упругими диполями) в рам-ках АЛТУ можно представить в виде [1, 13,14] …”

Section: взаимодействие стд с упругими полями мгнunclassified

“…Для отдельных дислокаций разных типов и ориентаций соответствующие расчёты были сделаны ра-нее [3][4][5][6][7], где было исследовано влияние дислокационных полей напряжений на энергетические и ки-нетические характеристики СТД.…”

Section: Introductionunclassified

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Interaction of Self-Point Defects With Low-Angle Tilt Boundaries in BCC Iron and Vanadium Crystals

Sivak¹,

Sivak²,

Романов³

et al. 2015

PAST-TF

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Взаимодействие собственных точечных дефектов с малоугловыми границами наклона в железе и ванадии ВАНТ. Сер. Поля напряжений дислокационных скоплений (границ разных типов) оказывают значительное влияние на образование и кине-тику собственных точечных дефектов (СТД: вакансий и межузельных атомов), определяя особенности образования и распада твёрдых растворов СТД. В связи с этим представляется важным исследовать влияние полей напряжений от дислокационных скоплений (границ) на энергетику образования и миграции СТД в кристаллах с разными степенями упругой анизотропии. В рамках анизотропной теории упругости рассчитана пространственная зависимость энергии взаимодействия СТД с малоугловы-ми границами наклона (бесконечные дислокационные стенки, состоящие из краевых дислокаций в системах скольжения <111>{110} и <111>{112}) в ОЦК-кристаллах железа и ванадия. Определены расстояния до малоугловых границ, на которых это взаимодействие существенно влияет на поведение СТД, в зависимости от температуры и угла разориентировки границ. При однородной генерации СТД по всему объёму кристалла их потоки слева и справа на малоугловую границу наклона могут быть разными.Ключевые слова: железо, ванадий, дислокационные стенки, малоугловые границы, поля напряжений, вакансии, собственные межузельные атомы, анизотропная теория упругости, взаимодействие, энергия образования и миграция собственных точечных дефектов. Stress fields of dislocation agglomerations (boundaries of different types) significantly affect the formation and kinetics of self-point defects (SPDs: vacancies and self-interstitial atoms) determining additional features of formation and decomposition of SPD solid solutions. Therefore it is important to study the influence of the dislocation agglomerations (boundaries) stress fields on the SPD formation and migration energies in crystals with different elastic anisotropy. Spatial dependence of the interaction energy of SPDs with low-angle tilt boundaries (infinite dislocation walls consisting of edge dislocations in slip systems <111>{110} and <111>{112}) in bcc iron and vanadium crystals has been calculated within the anisotropic theory of elasticity. Distances to the boundaries, at which this interaction appreciably affects the behaviour of SPDs against the temperature and the boundary misorientation angle have been determined. At spatially homogeneous generation of SPDs throughout the whole crystal volume, their fluxes from the left and the right onto a low-angle tilt boundary can differ. INTERACTION OF SELF-POINT DEFECTS WITH LOW-ANGLE TILT BOUNDARIES IN BCC IRON AND VANADIUM CRYSTALSKey words: iron, vanadium, dislocation walls, low-angle tilt boundaries, stress fields, vacancies, self-interstitial atoms, anisotropic theory of elasticity, interaction, self-point defects formation and migration energies. ВВЕДЕНИЕДислокации и их скопления разных типов являются основными источниками внутренних напряже-ний в металлических кристаллах и основанных на них конструкционных сталей и сплавов. Их поля на-пряжений оказывают значительное вл...

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Section: энергетические и кристаллографические характеристики стдunclassified

Section: взаимодействие стд с упругими полями мгнunclassified

Section: Introductionunclassified

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Interaction of Self-Point Defects With Low-Angle Tilt Boundaries in BCC Iron and Vanadium Crystals

Sivak¹,

Sivak²,

Романов³

et al. 2015

PAST-TF

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“…The dependence of the diffusion anisotropy ͑DA͒ on crystal orientation with respect to the external stress is thus neglected. While a few studies have considered the details of the crystal structure, 4,8,9 they have not explicitly calculated the degree of DA for simple, yet important, cases such as a crystal under an external biaxial or uniaxial stress field.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic diffusion of point defects in metals under a biaxial stress field simulation and theory

Chan

Averback

Ashkenazy

2008

Journal of Applied Physics

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We study the diffusion anisotropy (DA) of point defects in fcc and bcc metals in the presence of an applied biaxial stress. The DA depends sensitively on both the crystalline structure and the crystallographic direction in which the stress is applied. For example, interstitials in fcc metals diffuse faster in the plane of the compressive stress than normal to it when the stress is applied to the (001) plane, but they diffuse slower in-plane than out-of-plane when the stress is applied in the (111) plane. In contrast, an applied biaxial stress in the (001) plane of a bcc metal does not cause DA. These results can be explained by considering the interaction of the defects at their saddle point configurations with the external field, together with the constraints imposed by the crystal structure on the defect jump directions. Our calculations show that the DA can be large and lead to surprising results in a number of practical situations.

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“…The interatomic interactions in the model crystallite were described by the semiempirical potential [1,2]. The cubic shape model crystallites containing ~ (0.2-7)10 6 movable atoms (depending on the size of a loop under consideration) with fixed boundary conditions were used for defect properties calculations.…”

Section: Introductionmentioning

confidence: 99%

Strain Fields And Crystallographic Characteristics Of Interstitial Dislocation Loops of Various Geometry In BCC Iron

Sivak¹,

Романов²,

Chernov³

et al. 2008

AIP Conference Proceedings

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The formation energy, the relaxation volume, the dipole-force tensor, the self strain tensor and strain fields of interstitial dislocation loops in bcc iron (clusters of self interstitial atoms) have been calculated by molecular statics. Hexagonal and square dislocation loops of different types with different Burgers vectors, directions of dislocation segments and habit planes containing up to ~2500 self-interstitials have been considered. Analytical expressions describing size dependence of the formation energy, the relaxation volume and the self strain tensor for the loops stated have been obtained. The most energetically favorable loops are hexagonal loops with Burgers vector a/2<111> and habit plane {11x}, where x takes values in the range from 0 to 1 depending on the loop size. The formation energy of a<100> loops with <100> and <110> dislocation segments is ~14% and 23% greater than that of hexagonal a/2<111> loops at N > 500, respectively. The analysis of the formation energies of a/2<111> and a<100> loops demonstrated that the nucleation of an a<100> loop by joining of two a/2<111> loops is possible when the total number of constituent self-interstitials in these loops is larger than 13.

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Anisotropy migration of self-point defects in dislocation stress fields in BCC Fe and FCC Cu

Cited by 21 publications

References 6 publications

Interaction of Self-Point Defects With Low-Angle Tilt Boundaries in BCC Iron and Vanadium Crystals

Interaction of Self-Point Defects With Low-Angle Tilt Boundaries in BCC Iron and Vanadium Crystals

Anisotropic diffusion of point defects in metals under a biaxial stress field simulation and theory

Strain Fields And Crystallographic Characteristics Of Interstitial Dislocation Loops of Various Geometry In BCC Iron

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