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 |
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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 |
巻 | 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月 29 2004 → 12月 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