Metastable phase stability in the ternary Zr-Fe-Cr system

As the existing literature reports, when Zircaloy-2 and Zircaloy-4 are irradiated at intermediate temperatures with high-energy neutrons, a crystalline to amorphous phase transition occurs, coincidental with a preferential depletion of Fe at the periphery of the Zr(Fe, Cr) 2 intermetallic particles....

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Autores principales: Rodrı́guez, C., Barbiric, D.A., Pepe, M.E., Kovacs, J.A., Alonso, J.A., Hojvat de Tendler, R.
Formato: JOUR
Materias:
A. Intermetallics, miscellaneous
A. Ternary alloy systems
B. Irradiation effects
E. Phase stability, prediction
G. Energy systems
Crystal microstructure
Diffusion
Free energy
Neutron irradiation
Phase equilibria
Phase interfaces
Phase transitions
Solid solutions
Ternary systems
Zirconium alloys
Phase stability
Intermetallics
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09669795_v10_n2_p205_Rodriguez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09669795_v10_n2_p205_Rodriguez
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spelling todo:paper_09669795_v10_n2_p205_Rodriguez2023-10-03T15:54:58Z Metastable phase stability in the ternary Zr-Fe-Cr system Rodrı́guez, C. Barbiric, D.A. Pepe, M.E. Kovacs, J.A. Alonso, J.A. Hojvat de Tendler, R. A. Intermetallics, miscellaneous A. Ternary alloy systems B. Irradiation effects E. Phase stability, prediction G. Energy systems Crystal microstructure Diffusion Free energy Neutron irradiation Phase equilibria Phase interfaces Phase transitions Solid solutions Ternary systems Zirconium alloys Phase stability Intermetallics As the existing literature reports, when Zircaloy-2 and Zircaloy-4 are irradiated at intermediate temperatures with high-energy neutrons, a crystalline to amorphous phase transition occurs, coincidental with a preferential depletion of Fe at the periphery of the Zr(Fe, Cr) 2 intermetallic particles. In order to describe these phenomena, relative phase stability criteria combined with a balance between the rate of irradiation damage and irradiation enhanced diffusion leading back to a modified or new state should be considered. Aiming at this suggested study, in this work we calculate the metastable free-energy diagram of the ternary Zr-Fe-Cr system. The free energies of formation of the metastable amorphous and solid solution phases and of the stable Zr(Fe, Cr) 2 compound have been calculated using Miedema's model. By solving equations of analytical geometry, regions of metastable equilibria and their tie-lines are defined, linking the hcp-Zr-rich solid solution with the Zr-Fe-Cr amorphous phase, and the latter with the irradiation-energized compound. Composition profiles, reported in the literature, were measured on partially and completely amorphized particles, and also in the case when the latter experienced microcrystallization with solute reversion, that is, with the Fe concentration increased during post-irradiation heat treatments. Those composition profiles define a path along a calculated tie-line, deviating near the crystalline core/amorphous crown interface toward low Fe concentrations. The analysis in the present work suggests that the microstructure in irradiated Zircaloy tends to reach a new radiation-induced metastable co-existence of phases. © 2002 Elsevier Science Ltd. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09669795_v10_n2_p205_Rodriguez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic A. Intermetallics, miscellaneous
A. Ternary alloy systems
B. Irradiation effects
E. Phase stability, prediction
G. Energy systems
Crystal microstructure
Diffusion
Free energy
Neutron irradiation
Phase equilibria
Phase interfaces
Phase transitions
Solid solutions
Ternary systems
Zirconium alloys
Phase stability
Intermetallics
spellingShingle A. Intermetallics, miscellaneous
A. Ternary alloy systems
B. Irradiation effects
E. Phase stability, prediction
G. Energy systems
Crystal microstructure
Diffusion
Free energy
Neutron irradiation
Phase equilibria
Phase interfaces
Phase transitions
Solid solutions
Ternary systems
Zirconium alloys
Phase stability
Intermetallics
Rodrı́guez, C.
Barbiric, D.A.
Pepe, M.E.
Kovacs, J.A.
Alonso, J.A.
Hojvat de Tendler, R.
Metastable phase stability in the ternary Zr-Fe-Cr system
topic_facet A. Intermetallics, miscellaneous
A. Ternary alloy systems
B. Irradiation effects
E. Phase stability, prediction
G. Energy systems
Crystal microstructure
Diffusion
Free energy
Neutron irradiation
Phase equilibria
Phase interfaces
Phase transitions
Solid solutions
Ternary systems
Zirconium alloys
Phase stability
Intermetallics
description As the existing literature reports, when Zircaloy-2 and Zircaloy-4 are irradiated at intermediate temperatures with high-energy neutrons, a crystalline to amorphous phase transition occurs, coincidental with a preferential depletion of Fe at the periphery of the Zr(Fe, Cr) 2 intermetallic particles. In order to describe these phenomena, relative phase stability criteria combined with a balance between the rate of irradiation damage and irradiation enhanced diffusion leading back to a modified or new state should be considered. Aiming at this suggested study, in this work we calculate the metastable free-energy diagram of the ternary Zr-Fe-Cr system. The free energies of formation of the metastable amorphous and solid solution phases and of the stable Zr(Fe, Cr) 2 compound have been calculated using Miedema's model. By solving equations of analytical geometry, regions of metastable equilibria and their tie-lines are defined, linking the hcp-Zr-rich solid solution with the Zr-Fe-Cr amorphous phase, and the latter with the irradiation-energized compound. Composition profiles, reported in the literature, were measured on partially and completely amorphized particles, and also in the case when the latter experienced microcrystallization with solute reversion, that is, with the Fe concentration increased during post-irradiation heat treatments. Those composition profiles define a path along a calculated tie-line, deviating near the crystalline core/amorphous crown interface toward low Fe concentrations. The analysis in the present work suggests that the microstructure in irradiated Zircaloy tends to reach a new radiation-induced metastable co-existence of phases. © 2002 Elsevier Science Ltd. All rights reserved.
format JOUR
author Rodrı́guez, C.
Barbiric, D.A.
Pepe, M.E.
Kovacs, J.A.
Alonso, J.A.
Hojvat de Tendler, R.
author_facet Rodrı́guez, C.
Barbiric, D.A.
Pepe, M.E.
Kovacs, J.A.
Alonso, J.A.
Hojvat de Tendler, R.
author_sort Rodrı́guez, C.
title Metastable phase stability in the ternary Zr-Fe-Cr system
title_short Metastable phase stability in the ternary Zr-Fe-Cr system
title_full Metastable phase stability in the ternary Zr-Fe-Cr system
title_fullStr Metastable phase stability in the ternary Zr-Fe-Cr system
title_full_unstemmed Metastable phase stability in the ternary Zr-Fe-Cr system
title_sort metastable phase stability in the ternary zr-fe-cr system
url http://hdl.handle.net/20.500.12110/paper_09669795_v10_n2_p205_Rodriguez
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AT barbiricda metastablephasestabilityintheternaryzrfecrsystem
AT pepeme metastablephasestabilityintheternaryzrfecrsystem
AT kovacsja metastablephasestabilityintheternaryzrfecrsystem
AT alonsoja metastablephasestabilityintheternaryzrfecrsystem
AT hojvatdetendlerr metastablephasestabilityintheternaryzrfecrsystem
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