Microstructures and Mechanical Properties of Irradiated Metals and Alloys

Zinkle, Steven J.

doi:10.1007/978-1-4020-8422-5_11

Cited by 14 publications

(5 citation statements)

References 58 publications

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“…Effects such as hardening or loss of plasticity are common in metals exposed to irradiation [1,2]. The development of radiation resistant materials for fusion applications can benefit from a fundamental understanding of dislocation-defect interactions [3].…”

Section: Introductionmentioning

confidence: 99%

Collision cascade effects near an edge dislocation dipole in alpha-Fe: Induced dislocation mobility and enhanced defect clustering

Heredia-Ávalos

Denton

Moreno-Marı́n

et al. 2021

Journal of Nuclear Materials

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Collision cascades near a 1/2 111 {110} edge dipole in alpha-iron have been studied using molecular dynamics simulations for a recoil energy of 20 keV and two temperatures, 20 K and 300 K. These simulations show that the collision cascade induces the migration of the dislocations through glide along its slip plane. The motion of the dislocations starts at the peak of the collision cascade and expands a time scale much longer than the cascade duration, until restoring the equilibrium distance of the dipole, regardless of the damage produced by the cascade. At the initial stages, kinks are formed at the dislocation that enhance glide. When defects reach the dislocations, jogs are produced. We show that the initial dislocation motion is triggered by the shock wave of the collision cascade. The cascade morphology is also strongly influenced by the presence of the dislocations, having an elongated form at the peak of the displacement, which demonstrates the strong interaction of the dislocations with the cascade even at the early stages. Finally, we show that larger vacancy clusters are formed in the presence of dislocations compared to isolated cascades and that these clusters are larger for 300 K compared to 20 K.

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Section: Introductionmentioning

confidence: 99%

Collision cascade effects near an edge dislocation dipole in alpha-Fe: Induced dislocation mobility and enhanced defect clustering

Heredia-Ávalos

Denton

Moreno-Marı́n

et al. 2021

Journal of Nuclear Materials

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“…It is shown in [44] that the stationary mode is established in a time of about 3 10 7 s, which is about 1 year. What probabilities λ(t) and μ(t) appear in ( 6)- (7). In [33]…”

Section: Model Of "Death-and-birth"mentioning

confidence: 99%

Superstatistics and Lifetime

Ryazanov¹

2012

AJMS

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To describe the nonequilibrium states of a system we introduce a new thermodynamic parameter -the lifetime of a system. The statistical distributions which can be obtained out of the mesoscopic description characterizing the behaviour of a system by specifying the stochastic processes are written. Superstatistics, introduced as fluctuating quantities of intensive thermodynamical parameters, are obtained from statistical distribution with lifetime (random time to system degeneracy) as thermodynamical parameter (and also generalization of superstatistics). Necessary for this realization condition with expression for average lifetime of equilibrium statistical system obtained from stochastical storage model is consist. The obtained distribution passes in Gibbs or in superstatistics distribution depending on a measure of dissipativity in the system.

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“…By alloying and subsequent cold working or heat treatment, certain structural metallic materials can survive up to 60 years of irradiation [1,6]. However, the performance of these materials is still insufficient to meet the requirement for the next generation nuclear reactors: that is, these materials must sustain 300-400 displacements-per-atom (dpa) over 80 years [6,7]. It is a grand challenge to design advanced radiation tolerant metallic materials.…”

Section: Introductionmentioning

confidence: 99%

Superior tolerance of Ag/Ni multilayers against Kr ion irradiation: an in situ study

Kobayashi

Sun

Chen

et al. 2013

Philosophical Magazine

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Monolithic Ag and Ni films and Ag/Ni multilayers with individual layer thickness of 5 and 50 nm were subjected to in situ Kr ion irradiation at room temperature to 1 displacement-per-atom (a fluence of 2 Â 10 14 ions/cm 2 ). Monolithic Ag has high density of small loops (4 nm in diameter), whereas Ni has fewer but much greater loops (exceeding 20 nm). In comparison, dislocation loops, $4 nm in diameter, were the major defects in the irradiated Ag/Ni 50 nm film, while the loops were barely observed in the Ag/Ni 5 nm film. At 0.2 dpa (0.4 Â 10 14 ions/cm 2 ), defect density in both monolithic Ag and Ni saturated at 1.6 and 0.2 Â 10 23 /m 3 , compared with 0.8 Â 10 23 /m 3 in Ag/Ni 50 nm multilayer at a saturation fluence of $1 dpa (2 Â 10 14 ions/cm 2 ). Direct observations of frequent loop absorption by layer interfaces suggest that these interfaces are efficient defect sinks. Ag/Ni 5 nm multilayer showed a superior morphological stability against radiation compared to Ag/Ni 50 nm film.

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Microstructures and Mechanical Properties of Irradiated Metals and Alloys

Cited by 14 publications

References 58 publications

Collision cascade effects near an edge dislocation dipole in alpha-Fe: Induced dislocation mobility and enhanced defect clustering

Collision cascade effects near an edge dislocation dipole in alpha-Fe: Induced dislocation mobility and enhanced defect clustering

Superstatistics and Lifetime

Superior tolerance of Ag/Ni multilayers against Kr ion irradiation: an in situ study

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