Publication

Grain boundary segregation under neutron irradiation in dilute alloys

Maximo Pedro Victoria, Pierre Marmy
1998
Journal Articles

Abstract

Irradiation-induced segregation mechanisms are classified into solute-point-defect complex type and inverse Kirkendall type. For solutes that have a strong interaction with interstitials in a dilute alloy, the complex effect plays an important part in the segregation. Our earlier model describing solute grain boundary segregation during neutron irradiation in dilute binary alloys, based on the complex effect mechanism, is modified by considering the irradiation-enhanced solute diffusion and the long-range recombination effect of freely migrating point-defects, and expanded to evaluate solute segregation in dilute ternary alloys through consideration of solute-solute competition for segregation sites. Applications of the model to predictions of P grain boundary segregation in neutron irradiated alpha-Fe and Fe-B-P and Fe-C-P alloys indicate that the model has reasonable validity. (C) 1998 Elsevier Science B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/61830d8e-e4b8-4603-a996-faf4a36fd8d2

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Maximo Pedro Victoria, Pierre Marmy
1998
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/61830d8e-e4b8-4603-a996-faf4a36fd8d2

About this result

Related concepts (32)

Neutron activation

Neutron activation is the process in which neutron radiation induces radioactivity in materials, and occurs when atomic nuclei capture free neutrons, becoming heavier and entering excited states. The excited nucleus decays immediately by emitting gamma rays, or particles such as beta particles, alpha particles, fission products, and neutrons (in nuclear fission). Thus, the process of neutron capture, even after any intermediate decay, often results in the formation of an unstable activation product.

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Neutron activation analysis (NAA) is the nuclear process used for determining the concentrations of elements in many materials. NAA allows discrete sampling of elements as it disregards the chemical form of a sample, and focuses solely on atomic nuclei. The method is based on neutron activation and thus requires a source of neutrons. The sample is bombarded with neutrons, causing its constituent elements to form radioactive isotopes. The radioactive emissions and radioactive decay paths for each element have long been studied and determined.

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Related publications (1)

Grain boundary segregation under neutron irradiation in dilute alloys

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