Effects of irradiation-temperature change on void growth and shrinkage in ion-irradiated Nb

Loomis, B.A.; Gerber, S.B.

doi:10.1016/0022-3115(81)90556-0

Cited by 34 publications

(18 citation statements)

References 13 publications

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“…It is experimentally established that the sizes of voids in a lattice and in a random assembly at a given temperature are comparable, i.e., λ ∼ L [17][18][19][20]. This is in line with MCS results of Heinisch and Singh [8], who found that, for void-growth characteristics coming close to those observed experimentally, λ should be less than 2L.…”

Section: Void-growth Saturation Due To 1-d Siassupporting

confidence: 76%

“…Note that these peaks are much sharper than what appears because the distribution functions for this case are scaled down by a factor of 50. Such distributions represent a uniform void size and thus are not consistent with the much broader void size distributions observed in experiments [17,19,37]. These very sharp peaks in the void size distributions as well as the high void number densities are due to the dominance of mean-field void growth over the broadening effect of the stochastic fluctuations.…”

Section: Void Number Density and Size Distribution Of A Random Ensemblementioning

confidence: 48%

“…For a strong DAD (ε i = 0.5), a super-high void-number density of ∼10 26 m −3 is required to satisfy saturation sizes even as small as r s = 1.5 to 2.0 nm. Even with such small voids, the saturated swelling (S ∼ = N c n s ) would be on the order of 100%, much too large in comparison with experi-mental void-swelling in this temperature range, which seldom exceeds a few percent [17,19,20,27,34,36]. For a weak DAD corresponding to ε i ∼ 10 −2 , on the other hand, Fig.…”

Section: Void Number Density and Size Distribution Of A Random Ensemblementioning

confidence: 98%

“…1a for various values of n s (or the corresponding radius r s ) and the fractions ε i of 1-D SIAs. According to experimental observations in molybdenum [17,34], niobium [19], and nickel [35], the voids dominate the point-defect sinks during the process of void-lattice formation. Therefore, in Fig.…”

Section: Void Number Density and Size Distribution Of A Random Ensemblementioning

confidence: 99%

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Diffusion anisotropy and void development under cascade irradiation

2008

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Cascade irradiation of metals gives rise to swelling as a result of the creation of voids and the evolution of the void ensemble. Under suitable circumstances, the originally disordered void distribution transforms into to a void lattice. As demonstrated previously, the understanding of the evolution and the unique features of the void ensemble requires a difference in the anisotropy of the diffusion (DAD) of vacancies and self-interstitial atoms (SIAs), which is achieved by one-dimensional diffusion of the SIAs. On the other hand, void swelling has been successfully modeled in terms of three-dimensional diffusion of both vacancies and SIAs. In the present paper it is shown that these seemingly contradicting interpretations and all related observations can be quantitatively reconciled by a small DAD created by only ∼1% of SIAs diffusing one-dimensionally. It is also demonstrated that at the initial stage of void-lattice formation, ordering occurs mainly on close-packed crystal planes, which is in contrast to the naïve expectation that one- A difference between the anisotropies of diffusion of vacancies and self-interstitials (henceforth called Diffusional Anisotropy Difference or, briefly, DAD) gives rise to a bias that plays an important role in the irradiation-induced evolution of microstructures in metals. Based on Gösele's work [1] on reaction kinetics, the DAD effect was first introduced by Woo and Gösele [2] to explain irradiation growth. Later irradiation creep and void-lattice formation were interpreted in terms of DAD by Woo [3] and Woo and Frank [4], respectively, before DAD has been promoted to an important concept in the treatment of irradiation damage in non-cubic metals by Woo [5,6].The role played by DAD in the irradiation-induced transformation of a void ensemble from a randomly distributed collection to a highly ordered void lattice was summarized by Woo and Frank [7]: ". . . the one-dimensional migration of the (interstitial) crowdions. . . is in marked contrast to the three-dimensional diffusion of the dumbbell interstitials and the vacancies. This diffusional anisotropy difference between the crowdions and vacancies provides the source of ordering via a Darwinian selection among randomly distributed voids." Hence, the strength of DAD is important to the behavior of a void ensemble under irradiation, and at the same time, the evolution of the void ensemble reflects the

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Section: Void-growth Saturation Due To 1-d Siassupporting

confidence: 76%

Section: Void Number Density and Size Distribution Of A Random Ensemblementioning

confidence: 48%

Section: Void Number Density and Size Distribution Of A Random Ensemblementioning

confidence: 98%

Section: Void Number Density and Size Distribution Of A Random Ensemblementioning

confidence: 99%

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Diffusion anisotropy and void development under cascade irradiation

2008

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“…З підвищенням температури під час опромінення надґратниця нанопор руйнується, але зі зниженням температури вона знову від-новлюється (й до попереднього значення параметра) [80]. Слід за-значити, що надґратниця нанопор не спостерігається у ванадії або у стопах на основі ванадію; але, незважаючи на високу дозу опромі-нення [54], лише за великого вмісту домішок у ванадії має місце ча-сткове впорядкування нанопор [54,81].…”

Section: експериментальні дослідження явища просторово-періодичного вunclassified

Physical Kinetics of Redistribution of Point Defects in Irradiated Crystals

Oliinyk

Tatarenko

2012

Usp. Fiz. Met.

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Дано огляд літературних даних експериментальних спостережень самоор-ганізації дисипативних структур у кристалах під опроміненням. Розгляну-то вплив опромінення на стійкість однорідного розподілу густини точкових дефектів та утворення ними дисипативних модульованих структур на по-верхні та в об'ємі твердого тіла. Зазначено теоретичні підходи щодо опису умов утворення таких структур.Literary review of experimental data concerned with the observation of the self-organization of dissipative structures in crystals under irradiation is presented. An influence of irradiation on the stability of the homogeneous distribution of density of point defects and the formation of their dissipative modulated structures on the surface and in the bulk of a solid is considered. Theoretical approaches to the describing of the conditions of formation of such structures are mentioned.Обозреваются литературные данные экспериментальных наблюдений са-моорганизации диссипативных структур в кристаллах при облучении. Рас-смотрено влияние облучения на устойчивость однородного распределения плотности точечных дефектов и образования ими диссипативных модули-рованных структур на поверхности и в объёме твёрдого тела. Отмечены теоретические подходы к описанию условий образования таких структур.Ключові слова: опромінення, вакансії, нестійкість, самоорганізація, диси-пативна структура, модульована структура, нанопори, надґратниця.

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Superconductivity of Metals with a Superlattice of Voids

Rudko

Sugakov

1984

Physica Status Solidi (b)

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Superconductivity of metals with a superlattice of vacancy or gas voids is investigated in the preeence of magnetic fields around the second critical field Hc2, At H Hc2 the porous superconductor appears to be a system of an immense number of superconducting regions localized near the voids. The paper represents following results: (i) the dependence of the third critical field Hc3 on the void radius; (ii) the diamagnetic properties of the system; (iii) the

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Effects of irradiation-temperature change on void growth and shrinkage in ion-irradiated Nb

Cited by 34 publications

References 13 publications

Diffusion anisotropy and void development under cascade irradiation

Diffusion anisotropy and void development under cascade irradiation

Physical Kinetics of Redistribution of Point Defects in Irradiated Crystals

Superconductivity of Metals with a Superlattice of Voids

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