Influence of vacuum annealing conditions on the surface oxidation and vacancy condensation in the surface of an FeAl single crystal

A. Yamauchi; M. Tsunekane; Kazuya Kurokawa; Shuji Hanada; Kyosuke Yoshimi

doi:10.1016/j.intermet.2009.08.014

Influence of vacuum annealing conditions on the surface oxidation and vacancy condensation in the surface of an FeAl single crystal

A. Yamauchi, M. Tsunekane, Kazuya Kurokawa, Shuji Hanada, Kyosuke Yoshimi

ENG - Materials Science

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The influence of annealing atmosphere, temperature and time on the surface oxidation and vacancy condensation behavior of {111}-oriented single crystals of B2-type FeAl was investigated. AFM observation showed that as-annealed surfaces under a high vacuum were rugged and covered with a thin oxide film. The results obtained by TEM indicated that the thin oxide film was {001}-oriented κ-Al₂O₃ epitaxially grown on the {111}-oriented FeAl surface. AES measurements showed that the thickness of the oxide film was almost twice as thick as that of the passive Al₂O₃ film formed on the FeAl surface in an ambient atmosphere. It was found that the growth of surface mesopores is attributable to both the condensation of supersaturated vacancies in FeAl substrate and the Kirkendall effect by the surface oxidation during the vacuum annealing. Crown

Original language	English
Pages (from-to)	412-416
Number of pages	5
Journal	Intermetallics
Volume	18
Issue number	4
DOIs	https://doi.org/10.1016/j.intermet.2009.08.014
Publication status	Published - 2010 Apr

Keywords

A. Iron aluminides
B. Oxidation
D. Defects: point defect
F. Microscopy, various

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10.1016/j.intermet.2009.08.014

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title = "Influence of vacuum annealing conditions on the surface oxidation and vacancy condensation in the surface of an FeAl single crystal",

abstract = "The influence of annealing atmosphere, temperature and time on the surface oxidation and vacancy condensation behavior of {111}-oriented single crystals of B2-type FeAl was investigated. AFM observation showed that as-annealed surfaces under a high vacuum were rugged and covered with a thin oxide film. The results obtained by TEM indicated that the thin oxide film was {001}-oriented κ-Al2O3 epitaxially grown on the {111}-oriented FeAl surface. AES measurements showed that the thickness of the oxide film was almost twice as thick as that of the passive Al2O3 film formed on the FeAl surface in an ambient atmosphere. It was found that the growth of surface mesopores is attributable to both the condensation of supersaturated vacancies in FeAl substrate and the Kirkendall effect by the surface oxidation during the vacuum annealing. Crown",

keywords = "A. Iron aluminides, B. Oxidation, D. Defects: point defect, F. Microscopy, various",

author = "A. Yamauchi and M. Tsunekane and Kazuya Kurokawa and Shuji Hanada and Kyosuke Yoshimi",

note = "Funding Information: The authors would like to thank Mr. Y. Murakami for the technical support in the AES measurements at the Laboratory for Advanced Materials, Tohoku University. The authors express their sincere thanks to Prof. S. Taniguchi for criticizing the draft of this paper. This work was performed under the inter-university cooperative research program of the Institute for Materials Research, Tohoku University, and supported by a Grant-in-Aid for Science Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan under Contract No. 16360339.",

year = "2010",

month = apr,

doi = "10.1016/j.intermet.2009.08.014",

language = "English",

volume = "18",

pages = "412--416",

journal = "Intermetallics",

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T1 - Influence of vacuum annealing conditions on the surface oxidation and vacancy condensation in the surface of an FeAl single crystal

AU - Yamauchi, A.

AU - Tsunekane, M.

AU - Kurokawa, Kazuya

AU - Hanada, Shuji

AU - Yoshimi, Kyosuke

N1 - Funding Information: The authors would like to thank Mr. Y. Murakami for the technical support in the AES measurements at the Laboratory for Advanced Materials, Tohoku University. The authors express their sincere thanks to Prof. S. Taniguchi for criticizing the draft of this paper. This work was performed under the inter-university cooperative research program of the Institute for Materials Research, Tohoku University, and supported by a Grant-in-Aid for Science Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan under Contract No. 16360339.

PY - 2010/4

Y1 - 2010/4

N2 - The influence of annealing atmosphere, temperature and time on the surface oxidation and vacancy condensation behavior of {111}-oriented single crystals of B2-type FeAl was investigated. AFM observation showed that as-annealed surfaces under a high vacuum were rugged and covered with a thin oxide film. The results obtained by TEM indicated that the thin oxide film was {001}-oriented κ-Al2O3 epitaxially grown on the {111}-oriented FeAl surface. AES measurements showed that the thickness of the oxide film was almost twice as thick as that of the passive Al2O3 film formed on the FeAl surface in an ambient atmosphere. It was found that the growth of surface mesopores is attributable to both the condensation of supersaturated vacancies in FeAl substrate and the Kirkendall effect by the surface oxidation during the vacuum annealing. Crown

AB - The influence of annealing atmosphere, temperature and time on the surface oxidation and vacancy condensation behavior of {111}-oriented single crystals of B2-type FeAl was investigated. AFM observation showed that as-annealed surfaces under a high vacuum were rugged and covered with a thin oxide film. The results obtained by TEM indicated that the thin oxide film was {001}-oriented κ-Al2O3 epitaxially grown on the {111}-oriented FeAl surface. AES measurements showed that the thickness of the oxide film was almost twice as thick as that of the passive Al2O3 film formed on the FeAl surface in an ambient atmosphere. It was found that the growth of surface mesopores is attributable to both the condensation of supersaturated vacancies in FeAl substrate and the Kirkendall effect by the surface oxidation during the vacuum annealing. Crown

KW - A. Iron aluminides

KW - B. Oxidation

KW - D. Defects: point defect

KW - F. Microscopy, various

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DO - 10.1016/j.intermet.2009.08.014

M3 - Article

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SN - 0966-9795

VL - 18

SP - 412

EP - 416

JO - Intermetallics

JF - Intermetallics

IS - 4

ER -

Influence of vacuum annealing conditions on the surface oxidation and vacancy condensation in the surface of an FeAl single crystal

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