Combined microtomography, thermal desorption spectroscopy, X-ray diffraction study of hydrogen trapping behavior in 7XXX aluminum alloys

Md Shahnewaz Bhuiyan, Hiroyuki Toda, Zhang Peng, Su Hang, Keitaro Horikawa, Kentaro Uesugi, Akihisa Takeuchi, Nobuto Sakaguchi, Yoshio Watanabe

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In the present study, combined thermal desorption spectroscopy (TDS), microtomography and X-ray diffraction study has been carried out to identify the hydrogen trap sites in 7XXX aluminum alloys. Through constant heating rate TDS experiments, three distinct trap states have been identified. It is revealed that micropores are the predominant hydrogen trap site in alloys with medium hydrogen content, whereas grain boundaries is the major hydrogen trap site in alloys with low and high hydrogen content. We have clarified that the rate of trap site occupancy in grain boundaries is high compared to dislocations and vacancies. Such high hydrogen coverage at grain boundaries indicates that the hydrogen-assisted fracture would be intergranular.

Original languageEnglish
Pages (from-to)221-228
Number of pages8
JournalMaterials Science and Engineering A
Volume655
DOIs
Publication statusPublished - Feb 8 2016

All Science Journal Classification (ASJC) codes

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

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