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dc.contributor.author
Morán, Mauricio Javier
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dc.contributor.author
Álvarez, M. Vicente
dc.contributor.author
Vizcaino, Pablo
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dc.contributor.author
Brown, D.W.
dc.contributor.author
Santisteban, Javier Roberto
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dc.date.available
2024-01-02T15:10:13Z
dc.date.issued
2022-12
dc.identifier.citation
Morán, Mauricio Javier; Álvarez, M. Vicente; Vizcaino, Pablo; Brown, D.W.; Santisteban, Javier Roberto; Dislocation density evolution in cold-rolled Zr-2.5%Nb pressure tubes under thermal treatments by high energy XRD and neutron TOF diffraction peak profile analysis; Elsevier Science SA; Journal of Alloys and Compounds; 929; 167196; 12-2022; 1-15
dc.identifier.issn
0925-8388
dc.identifier.uri
http://hdl.handle.net/11336/222044
dc.description.abstract
Diffraction line profile analysis was done to characterize the change in the dislocation density at different stages of the processing route of a Zr-2.5%Nb pressure tube. Two diffraction experiments were carried out: High Energy X-Ray Diffraction (HE-XRD) and Neutron Time of Flight Diffraction (TOF-ND). On samples in the extruded, cold-rolled and post-annealed conditions, the HE-XRD experiment in transmission geometry allows a detailed characterization of the dependence of the line shape on the direction of the scattering vector. Important variations of the FWHM (Full Width at Half Maximum) were observed, which was interpreted as the non-uniform distribution of dislocations among grains with different orientations. Average values of the dislocation density and subgrain size were obtained after applying the Warren-Averbach method. The effect of post deformation annealing for soaking temperatures from 400° to 450°C was studied using TOF-ND. Peak profile analysis was performed on in-situ neutron time-of-flight diffractograms to obtain peak positions and widths to calculate residual stresses and dislocation densities. The results show that the dislocation density decreases largely at early times and it is followed by a slow diminution over time. Dislocation density decreases from ∼8 × 1014 m−2 for the cold-rolled sample to values close or under 2 × 1014 m−2. A remnant dislocation density after long annealing times was detected, with a value that decreases as the soaking temperature increases. Dislocation type was also characterized. It was found that dislocations with 〈a〉 Burgers vectors represent approximately 90% of the population, while the other 10% are 〈c+a〉. An empirical recovery kinetics model was proposed where dislocation mobility is assumed as a thermally activated mechanism. This model can be used as a processing tool to estimate the dislocation density expected for different soaking temperatures and times. The effect of residual stresses on peak broadening was also discussed. It was estimated that this contribution represents around 10–20% to the observed physical line broadening.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science SA
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
DISLOCATION DENSITY
dc.subject
HIGH ENERGY X RAY DIFFRACTION ANALYSIS
dc.subject
TIME OF FLIGHT NEUTRON DIFFRACTION ANALYSIS
dc.subject
ZR-2.5%NB
dc.subject.classification
Ingeniería de los Materiales
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dc.subject.classification
Ingeniería de los Materiales
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dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
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dc.title
Dislocation density evolution in cold-rolled Zr-2.5%Nb pressure tubes under thermal treatments by high energy XRD and neutron TOF diffraction peak profile analysis
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-01-02T11:45:48Z
dc.journal.volume
929
dc.journal.number
167196
dc.journal.pagination
1-15
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Morán, Mauricio Javier. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Álvarez, M. Vicente. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; Argentina
dc.description.fil
Fil: Vizcaino, Pablo. Comisión Nacional de Energía Atómica. Centro Atómico Ezeiza; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Brown, D.W.. Los Alamos National High Magnetic Field Laboratory; Estados Unidos
dc.description.fil
Fil: Santisteban, Javier Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; Argentina
dc.journal.title
Journal of Alloys and Compounds
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0925838822035873
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jallcom.2022.167196
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