Surface mesostructure change of B2-type FeAl single crystals by condensation of supersaturated thermal vacancies

Kyosuke Yoshimi, Takayuki Kobayashi, Akira Yamauchi, Tomohide Haraguchi, Shuji Hanada

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Mesoporous surfaces are formed in B2-type FeAl single crystals by quenching into iced water, followed by surface treatments and an ageing heat treatment. The pore shape changes depending on surface orientation, because the surfaces of the mesopores are surrounded by {100} planes in the same way as mesopores observed inside rapidly solidified FeAl ribbons. The pore size seems to increase with increasing temperature of the ageing heat treatment. Two relaxation peaks were observed in DSC thermograms, and the activation energy is estimated to be approximately 1.84 eV for the peak in a higher temperature range. TEM observations suggest that the observed DSC peaks correspond to vacancy condensation and/or absorption by 〈100〉-type dislocations. The experimental results also strongly suggest that the mesopore formation near surfaces is caused by the condensation of quenched-in, supersaturated thermal vacancies.

Original languageEnglish
Pages (from-to)331-344
Number of pages14
JournalPhilosophical Magazine
Volume85
Issue number2-3 SPEC. ISS.
DOIs
Publication statusPublished - 2005 Jan

ASJC Scopus subject areas

  • Condensed Matter Physics

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