Basic Defects in Metals

Ehrhart, P.; Robrock, K.-H.; Schober, H. R.

doi:10.1016/b978-0-444-86946-3.50007-3

Cited by 69 publications

(40 citation statements)

References 180 publications

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“…3 shows the vacancy concentration for 15-ML-thick Cu/Cu͑001͒ films grown at 110 K that were subsequently annealed at a higher temperature. These results are essentially identical to the well-known annealing behavior of vacancies observed in radiation damage studies of bulk copper: 15,16 c v exhibits a plateau between 100 and 200 K followed by a precipitous decrease between 200 and 300 K. The curve in the inset was calculated using a 0.72 eV activation energy that is known 16 for monovacancy mobility in Cu. This is further proof of the inclusion of vacancies in thin metal films grown at low temperatures.…”

Section: A͒supporting

confidence: 68%

Vacancy trapping and annealing in noble-metal films grown at low temperature

Botez

et al. 2002

Applied Physics Letters

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We have used synchrotron x-ray diffraction to study the homoepitaxial growth on Cu͑001͒, Ag͑001͒, and Ag͑111͒, at temperatures between 300 and 65 K. The growth on all of these surfaces exhibits a consistent trend towards a large compressive strain that is attributed to the incorporation of vacancies into the growing film below 160 K. In each case, the vacancy concentration is ϳ2% at 110 K and we have measured the temperature dependence for incorporation on the ͑001͒ surfaces as well as the annealing behavior for Cu͑001͒. These results, which suggest new kinetic mechanisms, have important implications for understanding epitaxial crystal growth.

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Section: A͒supporting

confidence: 68%

Vacancy trapping and annealing in noble-metal films grown at low temperature

Botez

et al. 2002

Applied Physics Letters

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“…Unlike metals, 296 where the structure of a vacancy is essentially a missing atom in the lattice, carbon nanotubes exhibit a strong reconstruction of the atomic network near the vacancy, which, as discussed below, results in many interesting effects, e.g., pressure buildup inside irradiated nanotubes. 19,297 DFT and DFT-based TB calculations 216,[298][299][300][301][302] showed that SVs in nanotubes reconstruct by saturating two dangling bonds and forming a pentagon, see Fig.…”

Section: Vacancies In Graphene and Carbon Nanotubesmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

947

591

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A common misconception is that the irradiation of solids with energetic electrons and ions has exclusively detrimental effects on the properties of target materials. In addition to the well-known cases of doping of bulk semiconductors and ion beam nitriding of steels, recent experiments show that irradiation can also have beneficial effects on nanostructured systems. Electron or ion beams may serve as tools to synthesize nanoclusters and nanowires, change their morphology in a controllable manner, and tailor their mechanical, electronic, and even magnetic properties. Harnessing irradiation as a tool for modifying material properties at the nanoscale requires having the full microscopic picture of defect production and annealing in nanotargets. In this article, we review recent progress in the understanding of effects of irradiation on various zero-dimensional and one-dimensional nanoscale systems, such as semiconductor and metal nanoclusters and nanowires, nanotubes, and fullerenes. We also consider the two-dimensional nanosystem graphene due to its similarity with carbon nanotubes. We dwell on both theoretical and experimental results and discuss at length not only the physics behind irradiation effects in nanostructures but also the technical applicability of irradiation for the engineering of nanosystems.

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“…Используемые потенциалы для ОЦК-кристаллитов ука-зывают на энергетическую выгодность гантельной конфигурации межузельных атомов вдоль направления <110>, что находится в согласии с имеющимися экспериментальными данными [17][18][19][20]. [14] [110] 30 30-35 [14] [111] 30 20 [14] V 300…”

Section: формализмunclassified

Md Simulation of Plastic Deformation Nucleation in Stressed Crystallites Under Irradiation

Korchuganov

Zolnikov

Крыжевич

et al. 2015

PAST-TF

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Изучение механизмов зарождения пластической деформации в металлах и сплавах при облучении и механическом нагружении является актуальной задачей материаловедения. Исследованы особенности зарождения и развития дефектной структуры в ме-ханически нагруженных кристаллитах железа, ванадия и меди при радиационном облучении. Расчёты проводились на основе молекулярно-динамического подхода. Механическое нагружение осуществлялось таким образом, чтобы объём моделируемого кристаллита оставался постоянным. Энергия первично-выбитого атома, формирующего каскад атомных смещений в нагружен-ном кристаллите, варьировалась в интервале от 0,05 до 50 кэВ. Каскады атомных смещений могут вызывать масштабные струк-турные перестройки в зоне значительно большей, чем радиационно-повреждённая область. Такие структурные перестройки аналогичны тем, что происходят при механическом нагружении образцов. В железе и ванадии они реализуются на основе меха-низма двойникования, в меди -посредством зарождения петель частичных дислокаций.Ключевые слова: кристаллы железа, ванадия, меди, механические напряжения, облучение, каскады атомных смещений, пла-стическая деформация, молекулярная динамика. Investigation of plasticity nucleation in metals and alloys under irradiation and mechanical loading is one of the actual problems of materials science. Features of nucleation and evolution of defect system in stressed iron, vanadium and copper crystallites under irradiation are studied by molecular dynamics simulations. Crystallite volume was constant during deformation of specimens. Energy of primary knock-on atom forming atomic displacement cascade in stressed specimens is varied from 0.05 to 50 keV. It was found that atomic displacement cascades in such crystallites may cause global structural changes in region greater than radiation damaged zone. These changes are similar to ones taking place during mechanical loading of specimens. They are realized by twinning in iron and vanadium and by formation of partial dislocation loops in copper. MD SIMULATION OF PLASTIC DEFORMATION NUCLEATION IN STRESSED CRYSTALLITES UNDER IRRADIATIONKey words: iron, vanadium, copper crystals, mechanical stresses, irradiation, atomic displacement cascades, plastic deformation, molecular dynamics. ВВЕДЕНИЕСоздание конструкционных материалов для ядерных и термоядерных реакторов требует детального изучения характера и особенностей структурных изменений в материалах на атомном уровне при меха-нических, термических и радиационных воздействиях. Это объясняется тем, что формирование дефект-ной структуры, которое впоследствии ведёт к изменению эксплуатационных свойств, начинается на атомном уровне [1]. Следует отметить, что высокоэнергетические динамические нагрузки и необходи-мость высокого пространственного и временного разрешения не позволяют экспериментально отслежи-вать зарождение и эволюцию структурных изменений на микроуровне. В связи с этим результаты ком-пьютерного моделирования, как правило, являются единственным источником информации о процессах, протекающих в исследуемых материа...

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Basic Defects in Metals

Cited by 69 publications

References 180 publications

Vacancy trapping and annealing in noble-metal films grown at low temperature

Vacancy trapping and annealing in noble-metal films grown at low temperature

Ion and electron irradiation-induced effects in nanostructured materials

Md Simulation of Plastic Deformation Nucleation in Stressed Crystallites Under Irradiation

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