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

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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

All Science Journal Classification (ASJC) codes

  • Instrumentation

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