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

S. Hata, K. Higuchi, T. Mitate, N. Kuwano, M. Itakura, Y. Tomokiyo, T. Nakano, Y. Nagasawa, Y. Umakoshi

研究成果: ジャーナルへの寄稿Conference article

抄録

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 Al 5Ti3, h-Al2Ti and so on. For the Al 5Ti3 and h-Al5Ti ordered states, the ordered-clusters are tiled periodically to form the Al5Ti 3 or h-Al2Ti domains and characteristic anti-phase boundary structures.

元の言語英語
ページ(範囲)175-180
ページ数6
ジャーナルMaterials Research Society Symposium - Proceedings
753
出版物ステータス出版済み - 11 10 2003
イベントDefect Properties and Related Phenomena in Intermetallic Alloys - Boston, MA, 米国
継続期間: 12 3 200212 5 2002

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Phase boundaries
High resolution transmission electron microscopy
Image processing
Atoms
Microstructure
image processing
transmission electron microscopy
microstructure
simulation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

HRTEM Observation of Partially Ordered Long-Period Superstructures in Al-Rich TiAl Alloys. / Hata, S.; Higuchi, K.; Mitate, T.; Kuwano, N.; Itakura, M.; Tomokiyo, Y.; Nakano, T.; Nagasawa, Y.; Umakoshi, Y.

:: Materials Research Society Symposium - Proceedings, 巻 753, 10.11.2003, p. 175-180.

研究成果: ジャーナルへの寄稿Conference article

Hata, S, Higuchi, K, Mitate, T, Kuwano, N, Itakura, M, Tomokiyo, Y, Nakano, T, Nagasawa, Y & Umakoshi, Y 2003, 'HRTEM Observation of Partially Ordered Long-Period Superstructures in Al-Rich TiAl Alloys', Materials Research Society Symposium - Proceedings, 巻. 753, pp. 175-180.
Hata, S. ; Higuchi, K. ; Mitate, T. ; Kuwano, N. ; Itakura, M. ; Tomokiyo, Y. ; Nakano, T. ; Nagasawa, Y. ; Umakoshi, Y. / HRTEM Observation of Partially Ordered Long-Period Superstructures in Al-Rich TiAl Alloys. :: Materials Research Society Symposium - Proceedings. 2003 ; 巻 753. pp. 175-180.
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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 Al 5Ti3, h-Al2Ti and so on. For the Al 5Ti3 and h-Al5Ti ordered states, the ordered-clusters are tiled periodically to form the Al5Ti 3 or h-Al2Ti domains and characteristic anti-phase boundary structures.",
author = "S. Hata and K. Higuchi and T. Mitate and N. Kuwano and M. Itakura and Y. Tomokiyo and T. Nakano and Y. Nagasawa and Y. Umakoshi",
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T1 - HRTEM Observation of Partially Ordered Long-Period Superstructures in Al-Rich TiAl Alloys

AU - Hata, S.

AU - Higuchi, K.

AU - Mitate, T.

AU - Kuwano, N.

AU - Itakura, M.

AU - Tomokiyo, Y.

AU - Nakano, T.

AU - Nagasawa, Y.

AU - Umakoshi, Y.

PY - 2003/11/10

Y1 - 2003/11/10

N2 - 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 Al 5Ti3, h-Al2Ti and so on. For the Al 5Ti3 and h-Al5Ti ordered states, the ordered-clusters are tiled periodically to form the Al5Ti 3 or h-Al2Ti domains and characteristic anti-phase boundary structures.

AB - 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 Al 5Ti3, h-Al2Ti and so on. For the Al 5Ti3 and h-Al5Ti ordered states, the ordered-clusters are tiled periodically to form the Al5Ti 3 or h-Al2Ti domains and characteristic anti-phase boundary structures.

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