Ti-rich precipitate evolution in vanadium-based alloys during annealing above 400 °C

A. Impagnatiello; T. Toyama; E. Jimenez-Melero

doi:10.1016/j.jnucmat.2016.12.040

Ti-rich precipitate evolution in vanadium-based alloys during annealing above 400 °C

A. Impagnatiello^*, T. Toyama, E. Jimenez-Melero

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

Abstract

We have assessed the plate-like TiO precipitate evolution in V-4Ti and V-4Ti-4Cr alloys during isochronal annealing above 400 °C, by combining Vickers hardness, positron lifetime and coincidence Doppler broadening measurements. Our results reveal the formation of additional TiO precipitates in both alloys at temperatures of 450–600 °C in both alloys. The implanted positrons become trapped at the nm-thick TiO/matrix interface, and act as effective probes of the concomitant annealing of vacancies taking place inside the TiO precipitates above 550 °C in V-4Ti alloy. The presence of Cr in the ternary alloy not only retards the recovery of dislocations, but also enhances the oxygen diffusivity and therefore decreases the vacancy content in the TiO precipitates. These results will impact the expected alloy stability and capacity to bind light elements in the operational temperature window of these alloys for fusion reaction applications.

Original language	English
Pages (from-to)	122-128
Number of pages	7
Journal	Journal of Nuclear Materials
Volume	485
DOIs	https://doi.org/10.1016/j.jnucmat.2016.12.040
Publication status	Published - 1 Mar 2017

Bibliographical note

Funding Information:
We acknowledge the Engineering and Physical Sciences Research Council (EPRSC) (EP/K504178/1) for providing funding for this project via the Centre for Doctoral Training in the Science and Technology of Fusion Energy (http://www.fusion-cdt.ac.uk/). The work described was supported in part by the Dalton Cumbrian Facility Project, a joint initiative of The University of Manchester and the Nuclear Decommissioning Authority. A.I. would also like to thank the Tohoku University for the travel grant to perform PAS experiments at its facilities.

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

Crystalline oxides
Electron microscopy
Nuclear fusion reactor
Positron annihilation
Refractory metal

ASJC Scopus subject areas

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

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10.1016/j.jnucmat.2016.12.040

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title = "Ti-rich precipitate evolution in vanadium-based alloys during annealing above 400 °C",

abstract = "We have assessed the plate-like TiO precipitate evolution in V-4Ti and V-4Ti-4Cr alloys during isochronal annealing above 400 °C, by combining Vickers hardness, positron lifetime and coincidence Doppler broadening measurements. Our results reveal the formation of additional TiO precipitates in both alloys at temperatures of 450–600 °C in both alloys. The implanted positrons become trapped at the nm-thick TiO/matrix interface, and act as effective probes of the concomitant annealing of vacancies taking place inside the TiO precipitates above 550 °C in V-4Ti alloy. The presence of Cr in the ternary alloy not only retards the recovery of dislocations, but also enhances the oxygen diffusivity and therefore decreases the vacancy content in the TiO precipitates. These results will impact the expected alloy stability and capacity to bind light elements in the operational temperature window of these alloys for fusion reaction applications.",

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author = "A. Impagnatiello and T. Toyama and E. Jimenez-Melero",

note = "Funding Information: We acknowledge the Engineering and Physical Sciences Research Council (EPRSC) (EP/K504178/1) for providing funding for this project via the Centre for Doctoral Training in the Science and Technology of Fusion Energy (http://www.fusion-cdt.ac.uk/). The work described was supported in part by the Dalton Cumbrian Facility Project, a joint initiative of The University of Manchester and the Nuclear Decommissioning Authority. A.I. would also like to thank the Tohoku University for the travel grant to perform PAS experiments at its facilities. Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

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doi = "10.1016/j.jnucmat.2016.12.040",

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AU - Toyama, T.

AU - Jimenez-Melero, E.

N1 - Funding Information: We acknowledge the Engineering and Physical Sciences Research Council (EPRSC) (EP/K504178/1) for providing funding for this project via the Centre for Doctoral Training in the Science and Technology of Fusion Energy (http://www.fusion-cdt.ac.uk/). The work described was supported in part by the Dalton Cumbrian Facility Project, a joint initiative of The University of Manchester and the Nuclear Decommissioning Authority. A.I. would also like to thank the Tohoku University for the travel grant to perform PAS experiments at its facilities. Publisher Copyright: © 2017 Elsevier B.V.

PY - 2017/3/1

Y1 - 2017/3/1

N2 - We have assessed the plate-like TiO precipitate evolution in V-4Ti and V-4Ti-4Cr alloys during isochronal annealing above 400 °C, by combining Vickers hardness, positron lifetime and coincidence Doppler broadening measurements. Our results reveal the formation of additional TiO precipitates in both alloys at temperatures of 450–600 °C in both alloys. The implanted positrons become trapped at the nm-thick TiO/matrix interface, and act as effective probes of the concomitant annealing of vacancies taking place inside the TiO precipitates above 550 °C in V-4Ti alloy. The presence of Cr in the ternary alloy not only retards the recovery of dislocations, but also enhances the oxygen diffusivity and therefore decreases the vacancy content in the TiO precipitates. These results will impact the expected alloy stability and capacity to bind light elements in the operational temperature window of these alloys for fusion reaction applications.

AB - We have assessed the plate-like TiO precipitate evolution in V-4Ti and V-4Ti-4Cr alloys during isochronal annealing above 400 °C, by combining Vickers hardness, positron lifetime and coincidence Doppler broadening measurements. Our results reveal the formation of additional TiO precipitates in both alloys at temperatures of 450–600 °C in both alloys. The implanted positrons become trapped at the nm-thick TiO/matrix interface, and act as effective probes of the concomitant annealing of vacancies taking place inside the TiO precipitates above 550 °C in V-4Ti alloy. The presence of Cr in the ternary alloy not only retards the recovery of dislocations, but also enhances the oxygen diffusivity and therefore decreases the vacancy content in the TiO precipitates. These results will impact the expected alloy stability and capacity to bind light elements in the operational temperature window of these alloys for fusion reaction applications.

KW - Crystalline oxides

KW - Electron microscopy

KW - Nuclear fusion reactor

KW - Positron annihilation

KW - Refractory metal

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JO - Journal of Nuclear Materials

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ER -

Ti-rich precipitate evolution in vanadium-based alloys during annealing above 400 °C

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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