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

R. Kasada, K. Sato

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)360-371
Number of pages12
JournalPhilosophical Magazine Letters
Volume99
Issue number10
DOIs
Publication statusPublished - 2019 Oct 3

Keywords

  • embrittlement
  • Fe-Cr alloys
  • phase separation
  • positron annihilation

ASJC Scopus subject areas

  • Condensed Matter Physics

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