TEM analysis of long-period superstructures in TiAl single crystal with composition gradient

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

研究成果: Contribution to journalConference article査読

抄録

The ordering mechanism of long-period superstructures (LPSs) in Al-rich Ti-Al alloys was studied using a TiAl single crystal with a composition gradient. A TiAl single crystal with gradient compositions from 55 to 75 at.% Al was prepared by annealing in a molten Al at 1234°C. The single crystal exhibits long-period ordering into different LPSs depending on the Al concentration as follows: an Al5Ti3 type short-range order, h-Al2Ti and one-dimensional antiphase domain structures. These LPSs show an orientation relationship in which Al (002) layers of the LPSs are parallel to those of the TiAl matrix. The atomic arrangements of the LPSs are characterized in common as the alternate stacking of the Al (002) layers and Ti-Al (002) layers. It is thus concluded that the ordering of this type of LPSs and the phase transition between these LPSs are explained as structural changes in Ti-Al (002) layers of the Al-rich L10-TiAl crystal.

本文言語英語
論文番号S7.5
ページ(範囲)259-264
ページ数6
ジャーナルMaterials Research Society Symposium Proceedings
842
出版ステータス出版済み - 2005
イベント2004 MRS Fall Meeting - Boston, MA, 米国
継続期間: 11 29 200412 1 2004

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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