Fundamental radiation effects parameters in metals and ceramics
TLDR
In this article, several fundamental aspects of defect cluster accumulation in irradiated ceramics and face centered cubic metals are reviewed, with particular emphasis on radiation hardening and the microstructural evolution in Cu observed by transmission electron microscopy (TEM).Abstract:
Several fundamental aspects of defect cluster accumulation in irradiated ceramics and face centered cubic metals are reviewed, with particular emphasis on radiation hardening and the microstructural evolution in Cu observed by transmission electron microscopy (TEM). At temperatures where interstitials are mobile (> 50 K in Cu), the defect cluster density in pure Cu is initially proportional to the dose and exhibits a square root dose dependence above ∼ 10−4 displacements per atom. This fluence dependence (determined from electrical resistivity and TEM studies) helps to resolve a long-standing controversy on the fluence dependence of radiation hardening. The fraction of freely migrating interstitials in copper irradiated with 14 MeV neutrons at room temperature is ∼ 11%. The activation energy for annealing stage V (stacking fault tetrahedra evaporation) in neutron-irradiated copper has been measured to be 0.84eV. Some features of the point defect accumulation behavior in ceramics are found to be v...read more
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Opportunities and limitations for ion beams in radiation effects studies: Bridging critical gaps between charged particle and neutron irradiations
TL;DR: In this article, the influence of near-surface denuded zones and implanted ion effects is analyzed, including diffusional broadening effects, at high ion irradiation energies, which can lead to enhanced defect production or recovery.
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Observation and analysis of defect cluster production and interactions with dislocations
TL;DR: In this paper, the defect production fundamentals in neutron-irradiated face centered cubic and body centered cubic (BCC) metals are briefly reviewed, based primarily on transmission electron microscope observations.
Journal ArticleDOI
Microstructure of Neutron-irradiated Iron Before and After Tensile Deformation
TL;DR: Examination of specimens after tensile deformation revealed localized deformation in the form of cleared dislocation channels, presumably due to the multiaxial stress state produced during necking and fracture of the tensile specimen.
Journal ArticleDOI
Defect structures and hardening mechanisms in high dose helium ion implanted Cu and Cu/Nb multilayer thin films
Nan Li,M. Nastasi,Amit Misra +2 more
TL;DR: In this paper, the microstructural evolutions and hardening mechanisms of pure 1-μm thick Cu film and Cu/Nb multilayers of individual layer thickness of 70nm, 5-nm and 2.5-nm were investigated after 1 at.% and 7-at.% He ion implants at room temperature.
Book ChapterDOI
Radiation-Induced Effects on Microstructure
TL;DR: In this paper, an overview of the key parameters that influence the microstructural evolution of irradiated materials (metallic and ceramic) is provided. But, the authors do not consider the effect of atomic displacements associated with energetic particle irradiation.
References
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A proposed method of calculating displacement dose rates
TL;DR: In this paper, a simple procedure is proposed for calculating the number of atomic displacements produced in a damage cascade by a primary knock-on atom of known energy, which is in close accord with recent computer simulations of radiation damage phenomena.
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The relation between polycrystal deformation and single-crystal deformation
TL;DR: In this paper, a phenomenological description of crystallographic slip and pencil glide in single crystals is outlined, with emphasis on the behavior under prescribed strains Theoretical relations are established between these single-crystal properties and the behavior of quasi-homogeneous, quasi-isotropic polycrystals deforming uniformly on a macroscopic scale, at subdiffusive temperatures.
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Defect production in ceramics
TL;DR: In this paper, a review is given of several important defect production and accumulation parameters for irradiated ceramics including alumina, magnesia, spinel, silicon carbide, silicon nitride, aluminum nitride and diamond.