HRTEM image contrast and atomistic microstructures of long-period ordered Al-rich TiAl alloys

Satoshi Hata, Kiyoshi Higuchi, Toshitsugu Mitate, Masaru Itakura, Yoshitsugu Tomokiyo, Noriyuki Kuwano, Takayoshi Nakano, Yosuke Nagasawa, Yukichi Umakoshi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Long-period superstructures formed in off-stoichiometric L1 0-TiAl alloys were investigated by high-resolution transmission electron microscopy (HRTEM). The HRTEM analysis combined with multislice simulation and image processing was carried out to clarify atomistic microstructures of Al5Ti3 and h-Al2Ti ordered states and a short-range ordered (SRO) state in Ti-62.5 at.% Al alloys. Aluminium atoms in the (002) Ti layers form square-, lean rhombus- and fat rhombus-type ordered clusters in the SRO state. The ordered clusters are in contact with each other and form microdomains of various long-period superstructures. The ordered clusters are tiled periodically in a long range to form Al5Ti3 or h-Al2Ti domains and characteristic antiphase boundary structures.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of Electron Microscopy
Volume53
Issue number1
DOIs
Publication statusPublished - Mar 31 2004

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image contrast
High resolution transmission electron microscopy
Transmission Electron Microscopy
transmission electron microscopy
microstructure
Microstructure
high resolution
Oils and fats
Aluminum
Image processing
antiphase boundaries
Fats
fats
Atoms
image processing
aluminum
atoms
simulation

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

HRTEM image contrast and atomistic microstructures of long-period ordered Al-rich TiAl alloys. / Hata, Satoshi; Higuchi, Kiyoshi; Mitate, Toshitsugu; Itakura, Masaru; Tomokiyo, Yoshitsugu; Kuwano, Noriyuki; Nakano, Takayoshi; Nagasawa, Yosuke; Umakoshi, Yukichi.

In: Journal of Electron Microscopy, Vol. 53, No. 1, 31.03.2004, p. 1-9.

Research output: Contribution to journalArticle

Hata, S, Higuchi, K, Mitate, T, Itakura, M, Tomokiyo, Y, Kuwano, N, Nakano, T, Nagasawa, Y & Umakoshi, Y 2004, 'HRTEM image contrast and atomistic microstructures of long-period ordered Al-rich TiAl alloys', Journal of Electron Microscopy, vol. 53, no. 1, pp. 1-9. https://doi.org/10.1093/jmicro/53.1.1
Hata, Satoshi ; Higuchi, Kiyoshi ; Mitate, Toshitsugu ; Itakura, Masaru ; Tomokiyo, Yoshitsugu ; Kuwano, Noriyuki ; Nakano, Takayoshi ; Nagasawa, Yosuke ; Umakoshi, Yukichi. / HRTEM image contrast and atomistic microstructures of long-period ordered Al-rich TiAl alloys. In: Journal of Electron Microscopy. 2004 ; Vol. 53, No. 1. pp. 1-9.
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