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Nanoporous Behavior Induced by Excess Vacancy Clustering in Rapidly-Solidified B2 FeAl Ribbons

Published online by Cambridge University Press:  11 February 2011

Tomohide Haraguchi ,
Kyosuke Yoshimi ,
Man H. Yoo ,
Hidemi Kato ,
Shuji Hanada  and
Akihisa Inoue
Tomohide Haraguchi
Affiliation:
Center for Interdisciplinary Research, Tohoku University, Sendai 980–8578, JAPAN Institute for Materials Research, Tohoku University, Sendai 980–8577, JAPAN
Kyosuke Yoshimi
Affiliation:
Center for Interdisciplinary Research, Tohoku University, Sendai 980–8578, JAPAN Institute for Materials Research, Tohoku University, Sendai 980–8577, JAPAN
Man H. Yoo
Affiliation:
Center for Interdisciplinary Research, Tohoku University, Sendai 980–8578, JAPAN
Hidemi Kato
Affiliation:
Center for Interdisciplinary Research, Tohoku University, Sendai 980–8578, JAPAN Institute for Materials Research, Tohoku University, Sendai 980–8577, JAPAN
Shuji Hanada
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–8577, JAPAN
Akihisa Inoue
Affiliation:
Center for Interdisciplinary Research, Tohoku University, Sendai 980–8578, JAPAN Institute for Materials Research, Tohoku University, Sendai 980–8577, JAPAN
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Abstract

Rapidly solidified ribbons of B2-ordered Fe-40, 45 and 50mol%Al were produced by a conventional single-roll melt-spinning method. The lattice parameters of as-spun ribbons are fully restored by annealing at 723 K for 24 h. This suggests that large numbers of supersaturated thermal vacancies are removed by the heat treatment. After the heat treatment, it is found that clustering of the supersaturated vacancies leads to a large number of pores that have a few hundreds nm or less in diameter near the surfaces, thus creating nanoporous surfaces. DSC measurements show irreversible exothermic peaks due to vacancy clustering. Vacancy complexes such as dislocations and pores are also observed inside the ribbons by TEM. The volume fraction of the overall vacancy complexes shows Al concentration dependence, demonstrating that defect structure formed by clustering of the excess vacancies is controllable by changing Al concentration in rapidly solidified FeAl ribbons.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB5.14
Copyright
Copyright © Materials Research Society 2003

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References

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