TEM observation of vacancy clustering process in FeAl single crystal

Masafumi Tsunekane, Kyosuke Yoshimi, Kouichi Maruyama

Research output: Contribution to journalConference article

Abstract

Nanoporous surfaces are formed in B2-type FeAl single crystals by quenching into iced water, followed by surface treatment and aging heat treatment. From our previous work, it was indicated that the nanoporous phenomenon is caused by the clustering of supersaturated thermal vacancies. In this study, the clustering process of supersaturated thermal vacancies was systematically investigated by transmission electron microscopy (TEM). An irreversible exothermic peak was detected for as-quenched specimens by differential scanning calorimetry (DSC). The isochronal changes of surface morphology and substructure around the exothermic peak temperature were clarified by TEM observation. The average size of the surface pores monotonously increased with increasing the temperature. Dislocations whose Burgers vectors are parallel to 〈100〉 existed in the isochronally-heated single crystals, and their density was changed with heat treatment temperature. On the other hand, there was a dislocation-free zone from the surface to the depth of several tens nanometers. A growth model of the surface pores is discussed based on the results.

Original languageEnglish
Pages (from-to)69-74
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume980
Publication statusPublished - 2007 Jun 29
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: 2006 Nov 272006 Nov 29

ASJC Scopus subject areas

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

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