Electron-irradiation-induced Cr segregation in Fe-Cr model alloy pre-implanted with hydrogen ions

Yufeng Du, Wentuo Han, Lijuan Cui, Farong Wan

Research output: Contribution to journalArticlepeer-review

Abstract

Reduced activation ferritic/martensitic (RAFM) steels are widely accepted as the candidate structural materials for fusion reactors. To gain knowledge about Cr behaviour of these steels in such environments, Fe-Cr binary alloys have to be investigated. In this study, Fe-10 at.% Cr ferritic model alloy pre-implanted with hydrogen ions was electron-irradiated in a high voltage electron microscope (HVEM) at the temperature ranging from 300 °C to 600 °C. Streaks were observed in the diffraction patterns in the model alloy after electron irradiation at 450–550 °C and explained reasonably by shape effect. The analysis of transmission electron microscopy (TEM) reveals that the observed streaks are induced by a kind of needle-like precipitates with the directions along 〈100〉. The dependence of the length and density of the precipitates on the temperature were studied. In addition, contrast experiments were conducted with pure Fe and Fe-10 at.% Cr alloy with and without hydrogen ion implantation, respectively. After electron irradiation, no streak was observed in the hydrogen-implanted pure Fe and Fe-10 at.% Cr alloy without the hydrogen implantation. Therefore, it is assumed that the needle-like precipitates could be the complex of Cr and H, which segregate and precipitate along 〈100〉 direction.

Original languageEnglish
Pages (from-to)364-372
Number of pages9
JournalMaterials Characterization
Volume139
DOIs
Publication statusPublished - 2018 May
Externally publishedYes

Keywords

  • Cr needle-like precipitates
  • Electron irradiation
  • Hydrogen effect
  • Streak diffraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Electron-irradiation-induced Cr segregation in Fe-Cr model alloy pre-implanted with hydrogen ions'. Together they form a unique fingerprint.

Cite this