HRTEM image contrast and atomistic microstructures of long-period ordered Al-rich TiAl alloys |
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| Authors: | Hata Satoshi Higuchi Kiyoshi Mitate Toshitsugu Itakura Masaru Tomokiyo Yoshitsugu Kuwano Noriyuki Nakano Takayoshi Nagasawa Yosuke Umakoshi Yukichi |
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| Affiliation: | Department of Applied Science for Electronics and Materials, Kyushu University, Fukuoka 816-8580, Japan. hata@asem.kyushu-u.ac.jp |
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| Abstract: | Long-period superstructures formed in off-stoichiometric L 1(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. |
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