Microscopic properties of long-period ordering in Al-Rich TiAl alloys

S. Hata, T. Nakano, N. Kuwano, M. Itakura, S. Matsumura, Y. Umakoshi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The ordering mechanism of long-period superstructures (LPSs) in Al-rich TiAl alloys has been investigated by high-resolution transmission electron microscopy (HRTEM). The LPSs are classified in terms of arrangements of base clusters with different shapes and compositions formed in Ti-rich (002) layers of L 10-TiAl matrix: square Ti4Al, fat rhombus Ti3Al, and lean rhombus Ti2Al type clusters. The HRTEM observations revealed that antiphase boundaries of long-range-ordered LPS domains and short-range-ordered microdomains are constructed by various space-filling arrangements of the base clusters. Such a microscopic property characterized by the base clusters and their arrangements is markedly analogous to that of the 〈1,1/2,0〉* special-point ordering alloys such as Ni-Mo.

Original languageEnglish
Pages (from-to)1610-1617
Number of pages8
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number7
Publication statusPublished - Jul 2008

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


Dive into the research topics of 'Microscopic properties of long-period ordering in Al-Rich TiAl alloys'. Together they form a unique fingerprint.

Cite this