Positron annihilation study on the phase transition of thermally aged Fe-Cr binary alloys at 748K

R. Kasada; K. Sato

doi:10.1080/09500839.2019.1695070

Positron annihilation study on the phase transition of thermally aged Fe-Cr binary alloys at 748K

R. Kasada, K. Sato

IMR - Materials Design Division

Kagoshima University

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

2 Citations (Scopus)

Abstract

The phase transition of Fe_1-xCr_x alloys after thermal aging at 748 K has been investigated by means of positron annihilation spectroscopy. It was observed that the implanted positrons preferentially annihilate with Fe electrons. The Cr concentration dependence of the W-parameter before thermal aging is quantitatively described by a preferential positron annihilation model within the first two coordination shells. After thermal aging, the W-parameter increased for all alloys, probably on account of an enhanced preferential positron annihilation of Fe atoms according to the growth of Cr-rich phases by thermal aging. Simultaneously, Fe-rich phases were formed and the interface condition between the Fe- and Cr-rich phases changed, providing another mechanism by which positrons are preferentially annihilated with Fe electrons in the Fe-rich phases.

Original language	English
Pages (from-to)	360-371
Number of pages	12
Journal	Philosophical Magazine Letters
Volume	99
Issue number	10
DOIs	https://doi.org/10.1080/09500839.2019.1695070
Publication status	Published - 2019 Oct 3

Keywords

embrittlement
Fe-Cr alloys
phase separation
positron annihilation

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10.1080/09500839.2019.1695070

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title = "Positron annihilation study on the phase transition of thermally aged Fe-Cr binary alloys at 748K",

abstract = "The phase transition of Fe1-xCrx alloys after thermal aging at 748 K has been investigated by means of positron annihilation spectroscopy. It was observed that the implanted positrons preferentially annihilate with Fe electrons. The Cr concentration dependence of the W-parameter before thermal aging is quantitatively described by a preferential positron annihilation model within the first two coordination shells. After thermal aging, the W-parameter increased for all alloys, probably on account of an enhanced preferential positron annihilation of Fe atoms according to the growth of Cr-rich phases by thermal aging. Simultaneously, Fe-rich phases were formed and the interface condition between the Fe- and Cr-rich phases changed, providing another mechanism by which positrons are preferentially annihilated with Fe electrons in the Fe-rich phases.",

keywords = "embrittlement, Fe-Cr alloys, phase separation, positron annihilation",

author = "R. Kasada and K. Sato",

note = "Funding Information: One of the authors (RK) wishes to thank Mr. Y. Sakamoto for technical assistance. The authors express sincere thanks to Professors A. Kimura, T. Yoshiie, Q. Xu, and S. Konishi for fruitful discussions. Financial support was provided by the Strategic Promotion Program for Basic Nuclear Research by the Ministry of Education, Culture, Sports, Science and Technology of Japan. Publisher Copyright: {\textcopyright} 2019, {\textcopyright} 2019 Informa UK Limited, trading as Taylor & Francis Group.",

year = "2019",

month = oct,

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doi = "10.1080/09500839.2019.1695070",

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AU - Kasada, R.

AU - Sato, K.

N1 - Funding Information: One of the authors (RK) wishes to thank Mr. Y. Sakamoto for technical assistance. The authors express sincere thanks to Professors A. Kimura, T. Yoshiie, Q. Xu, and S. Konishi for fruitful discussions. Financial support was provided by the Strategic Promotion Program for Basic Nuclear Research by the Ministry of Education, Culture, Sports, Science and Technology of Japan. Publisher Copyright: © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.

PY - 2019/10/3

Y1 - 2019/10/3

N2 - The phase transition of Fe1-xCrx alloys after thermal aging at 748 K has been investigated by means of positron annihilation spectroscopy. It was observed that the implanted positrons preferentially annihilate with Fe electrons. The Cr concentration dependence of the W-parameter before thermal aging is quantitatively described by a preferential positron annihilation model within the first two coordination shells. After thermal aging, the W-parameter increased for all alloys, probably on account of an enhanced preferential positron annihilation of Fe atoms according to the growth of Cr-rich phases by thermal aging. Simultaneously, Fe-rich phases were formed and the interface condition between the Fe- and Cr-rich phases changed, providing another mechanism by which positrons are preferentially annihilated with Fe electrons in the Fe-rich phases.

AB - The phase transition of Fe1-xCrx alloys after thermal aging at 748 K has been investigated by means of positron annihilation spectroscopy. It was observed that the implanted positrons preferentially annihilate with Fe electrons. The Cr concentration dependence of the W-parameter before thermal aging is quantitatively described by a preferential positron annihilation model within the first two coordination shells. After thermal aging, the W-parameter increased for all alloys, probably on account of an enhanced preferential positron annihilation of Fe atoms according to the growth of Cr-rich phases by thermal aging. Simultaneously, Fe-rich phases were formed and the interface condition between the Fe- and Cr-rich phases changed, providing another mechanism by which positrons are preferentially annihilated with Fe electrons in the Fe-rich phases.

KW - embrittlement

KW - Fe-Cr alloys

KW - phase separation

KW - positron annihilation

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DO - 10.1080/09500839.2019.1695070

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EP - 371

JO - Philosophical Magazine Letters

JF - Philosophical Magazine Letters

IS - 10

ER -

Positron annihilation study on the phase transition of thermally aged Fe-Cr binary alloys at 748K

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Keywords

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