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Nanostructure of Surface Formed by Vacancy Clustering in FeAl

Published online by Cambridge University Press:  10 February 2011

Kyosuke Yoshimi ,
Tomohide Haraguchi ,
Tomohisa Ogawa ,
Takayuki Kobayashi ,
Min-Seok Sung  and
Shuji Hanada
Kyosuke Yoshimi
Affiliation:
Center for Interdisciplinary Research, Tohoku University, Sendai 980-8578, JAPAN
Tomohide Haraguchi
Affiliation:
Center for Interdisciplinary Research, Tohoku University, Sendai 980-8578, JAPAN
Tomohisa Ogawa
Affiliation:
Department of Biomolecular Science, Tohoku University, Sendai 981-8555, JAPAN
Takayuki Kobayashi
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8578, JAPAN
Min-Seok Sung
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8578, JAPAN
Shuji Hanada
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8578, JAPAN
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Abstract

In B2-type FeAl, supersaturated vacancies retained upon rapidly quenching are absorbed near surface during an aging treatment, being agglomerated into nano- to meso-clusters through the absorption process. Eventually, surface morphology is self-patterned in nano-order by the vacancy clustering. If FeAl was not quenched from high temperature or plastic strain remained near surface, the surface self-patterning never occurs, indicating that the change in surface morphology is caused by the clustering of supersaturated vacancies. The clusters have specific shape with cluster surfaces faceted toward {100} planes. Thus, the shape of the clusters formed near surface is controllable by changing surface orientation. Vacancy cluster size and its distribution density can be also controlled by varying the concentration of supersaturated vacancies and/or the clustering condition. These indicate that the vacancy clustering is a unique process to efficiently pattern the surfaces of metals, alloys and intermetallics in nano-scale.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 775: Symposium P – Self-Assembled Nanostructured Materials , 2003 , P9.49
Copyright
Copyright © Materials Research Society 2003

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References

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