Semi-quantitative HRTEM for partially ordered materials: Application to Al-rich TiAl alloys

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

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4 Citations (Scopus)


Microstructures of long-period ordered TiAl alloys that are rich in Al were investigated by the semi-quantitative high-resolution transmission electron microscopy (HRTEM). Local ordered arrangements of Al atoms in (002) Ti-rich layers of the L 10 matrix were identified from arrangements of very bright dots in the HRTEM images after appropriate image processing. For a short-range order (SRO) state, the Al atoms form three types of ordered-clusters: square (Ti4Al), fat rhombus (Ti3Al) and lean rhombus (Ti2Al). These clusters are arranged periodically in a short-range to form microdomains of various long-period superstructures: Al5Ti3, h-Al2Ti and so on. Below or above the temperature range showing the SRO state, the Al5Ti3 or h-Al2Ti type cluster-arrangements selectively develop into their long-range order (LRO) domains. Some of the other cluster-arrangements are left between the LRO domains as anti-phase boundary structures.

Original languageEnglish
Pages (from-to)1721-1726
Number of pages6
JournalMaterials Science Forum
Issue number2
Publication statusPublished - 2003
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: Jul 7 2003Jul 11 2003

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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