Selectivity of anti-phase boundary introduced in Al5Ti3 superstructure

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

研究成果: Contribution to journalConference article査読

6 被引用数 (Scopus)

抄録

Formation of anti-phase boundaries (APBs) in the Al5Ti3 long-period superstructure of Al-rich TiAl single crystals was examined by the high-resolution transmission electron microscopy (HRTEM) with image processing. The APBs were analyzed focusing on the unique units of ordered clusters such as Ti4Al, Ti3Al and Ti2Al which form square, fat rhombus and lean rhombus shapes in (002) Ti-rich layers, respectively. The Al5Ti3-type anti-phase domains (APDs) with various sizes in diameter were obtained in Ti-62.5at.%Al crystals by heat treatment at 600°C or 750°C after the floating zone melting and the subsequent quenching from 1200°C. Almost all the Al5Ti3-type APBs lay on {110) and were geometrically classified into 19 types named Type A to Type S. Indeed, 6 types of APBs (Type A to Type F) composed of the units of Ti4Al, Ti3Al and Ti2Al were found, but the other 13 types (Type G to Type S) were not clearly observed. Moreover, a specific type called Type A among the APBs was preferentially formed even in the initial stage of the APD growth. The APBs of Type A appeared with a quite higher frequency than those ideally formed by the random-nucleation and subsequent bounding of APDs. Thus, the APBs of Type A must be already introduced in the stage for nucleation of the APDs and grow stably on {110) due to the quite low APB energy in the long-period superstructure with a relatively large unit cell.

本文言語英語
ページ(範囲)1763-1770
ページ数8
ジャーナルMaterials Science Forum
426-432
2
出版ステータス出版済み - 2003
イベントThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, スペイン
継続期間: 7 7 20037 11 2003

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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