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

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish
Pages (from-to)175-180
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Publication statusPublished - 2003
EventDefect Properties and Related Phenomena in Intermetallic Alloys - Boston, MA, United States
Duration: Dec 3 2002Dec 5 2002

All Science Journal Classification (ASJC) codes

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


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