Transition of creep mechanism by solute hydrogen in Zircaloy-4

Tetsuya Matsunaga, Hiromichi Hongo, Masaaki Tabuchi, Yuhki Satoh, Hiroaki Abe

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effect of solute hydrogen up to 200 ppm on the creep mechanism of Zircaloy-4 was discussed to ascertain the safety of nuclear power plants. Creep tests performed at 673 K and revealed that the addition of solute hydrogen decreased the creep rate in intermediate stress regions. According to the followed transmission electron microscopy, the phenomenon reflected the change of rate-controlling mechanisms without or with solute hydrogen: cross-slip in a non-hydrogenated sample with H=10 ppm; solute-atmosphere dragging process in hydrogenated samples with H=100 and 200 ppm. Because cross-slip works as the annihilation process for the glide dislocations in Zircaloy-4, it is considered that the suppression of cross-slip by solute hydrogen leads to a decrease in the creep rate.

Original languageEnglish
Pages (from-to)191-195
Number of pages5
JournalMaterials Science and Engineering A
Volume684
DOIs
Publication statusPublished - 2017 Jan 27

Keywords

  • Creep
  • Cross-slip
  • Dislocation network
  • Solute hydrogen
  • Straight dislocation
  • Zircaloy-4

ASJC Scopus subject areas

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

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