Metallurgical and Materials Transactions A

, Volume 39, Issue 7, pp 1610–1617 | Cite as

Microscopic Properties of Long-Period Ordering in Al-Rich TiAl Alloys

  • S. Hata
  • T. Nakano
  • N. Kuwano
  • M. Itakura
  • S. Matsumura
  • Y. Umakoshi
Symposium: Materials Behavior: Far from Equilibrium
First Online:

Abstract

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 L10-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 \( {\left\langle {{\text{1,1/2,0}}} \right\rangle } \)* special-point ordering alloys such as Ni-Mo.

Keywords

Base Cluster Fourier Power Spectrum HRTEM Observation Cluster Arrangement Defocus Distance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

The authors thank Dr. U.D. Kulkarni (Bhabha Atomic Research Centre, Mumbai, India) for his valuable comments. This work was partly supported by the Grant-in-Aid for Young Scientists (Grant No. 18681019) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT).

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Copyright information

© THE MINERALS, METALS & MATERIALS SOCIETY and ASM INTERNATIONAL 2008

Authors and Affiliations

  • S. Hata
    • 1
  • T. Nakano
    • 2
  • N. Kuwano
    • 3
  • M. Itakura
    • 1
  • S. Matsumura
    • 4
  • Y. Umakoshi
    • 2
  1. 1.Department of Engineering Sciences for Electronics and MaterialsKyushu UniversityKasugaJapan
  2. 2.Course of Materials Science & Engineering, Division of Materials & Manufacturing ScienceOsaka UniversitySuitaJapan
  3. 3.Art, Science and Technology Center for Cooperative ResearchKyushu UniversityKasugaJapan
  4. 4.Department of Applied Quantum Physics and Nuclear EngineeringKyushu UniversityFukuokaJapan

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