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

  • Symposium: Materials Behavior: Far from Equilibrium
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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.

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Notes

  1. \( {\left\langle {{\text{1,1/2,0}}} \right\rangle } \) means the special-point vector with k = 1,1/2,0

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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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Authors and Affiliations

  1. Department of Engineering Sciences for Electronics and Materials, Kyushu University, Kasuga, 816-8580, Japan

    S. Hata (Associate Professor) & M. Itakura (Associate Professor)

  2. Course of Materials Science & Engineering, Division of Materials & Manufacturing Science, Osaka University, Suita, 565-0871, Japan

    T. Nakano (Associate Professor) & Y. Umakoshi (Professor)

  3. Art, Science and Technology Center for Cooperative Research, Kyushu University, Kasuga, 816-8580, Japan

    N. Kuwano (Professor)

  4. Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka, 819-0395, Japan

    S. Matsumura (Professor)

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  1. S. Hata
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  2. T. Nakano
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  4. M. Itakura
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Correspondence to S. Hata.

Additional information

This article is based on a presentation given in the symposium entitled “Materials Behavior: Far from Equilibrium” as part of the Golden Jubilee Celebration of Bhabha Atomic Research Centre, which occurred December 15–16, 2006 in Mumbai, India.

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Hata, S., Nakano, T., Kuwano, N. et al. Microscopic Properties of Long-Period Ordering in Al-Rich TiAl Alloys. Metall Mater Trans A 39, 1610–1617 (2008). https://doi.org/10.1007/s11661-007-9397-x

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