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HRTEM Observation of Partially Ordered Long-Period Superstructures in Al-Rich TiAl Alloys

Published online by Cambridge University Press:  11 February 2011

S. Hata ,
K. Higuchi ,
T. Mitate ,
N. Kuwano ,
M. Itakura ,
Y. Tomokiyo ,
T. Nakano ,
Y. Nagasawa  and
Y. Umakoshi
S. Hata
Affiliation:
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816–8580, Japan
K. Higuchi
Affiliation:
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816–8580, Japan
T. Mitate
Affiliation:
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816–8580, Japan
N. Kuwano
Affiliation:
Advanced Science and Technology Center for Cooperative Research, Kyushu University, Kasuga, Fukuoka 816–8580, Japan
M. Itakura
Affiliation:
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816–8580, Japan
Y. Tomokiyo
Affiliation:
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816–8580, Japan
T. Nakano
Affiliation:
Department of Materials Science and Engineering & Handai Frontier Research Center, Graduate School of Engineering, Osaka University, Suita, Osaka 565–0871, Japan
Y. Nagasawa
Affiliation:
Department of Materials Science and Engineering & Handai Frontier Research Center, Graduate School of Engineering, Osaka University, Suita, Osaka 565–0871, Japan
Y. Umakoshi
Affiliation:
Department of Materials Science and Engineering & Handai Frontier Research Center, Graduate School of Engineering, Osaka University, Suita, Osaka 565–0871, Japan
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Abstract

Atomistic microstructures of long-period superstructures in Al-rich TiAl alloys were investigated by high-resolution transmission electron microscopy. The multi-slice image simulation revealed that Al-atoms in Ti-rich (002) layers of the superstructures are imaged as very bright dots under appropriate observing conditions. By enhancing the contrast of the very bright dots using an image processing technique, partially ordered long-period superstructures were clearly characterized. For the short-range order state, A4B, A2B and A3B type ordered-clusters are generated in the Ti-rich (002) layers. These ordered-clusters are in contact with each other, and form local microdomains of various superstructures, such as Al5Ti3, h-Al2Ti and so on. For the Al5Ti3 and h-Al2Ti ordered states, the ordered-clusters are tiled periodically to form the Al5Ti3 or h-Al2Ti domains and characteristic anti-phase boundary structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB4.2
Copyright
Copyright © Materials Research Society 2003

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