Ordering process and formation of anti-phase boundary in long-period superstructures of Al-rich TiAl single crystals

Takayoshi Nakano; Yosuke Nagasawa; Yukichi Umakoshi; Satoshi Hata; Noriyuki Kuwano; Masaru Itakura; Yoshitsugu Tomokiyo

Ordering process and formation of anti-phase boundary in long-period superstructures of Al-rich TiAl single crystals

Takayoshi Nakano, Yosuke Nagasawa, Yukichi Umakoshi, Satoshi Hata, Noriyuki Kuwano, Masaru Itakura, Yoshitsugu Tomokiyo

Materials Physics and Engineering

Research output: Contribution to conference › Paper › peer-review

Abstract

Ordering process and subsequent formation of anti-phase boundaries (APBs) in the long-period superstructures of X₃Ti₂ (Ga ₃Ti₂), X₅Ti₃ (Al₅Ti ₃) and h-X₂Ti (h-Al₂Ti) in -rich TiX (X=Al or Ga) single crystals were examined by a high-resolution transmission electron microscopy. Formation of the APBs is closely related to the unique units of ordered base clusters such as Ti₄X, Ti₃X and Ti ₂X which form square, fat rhombus and lean rhombus shapes, respectively, in the (002) Ti-rich layers of the L1₀ matrix. The Al₅Ti₃-type anti-phase domains (APDs) with various sizes in diameter are introduced in Ti-62.5at.%Al crystals by appropriate heat treatment. Almost all the X₅Ti₃-type APBs lie on {110) and a type of APB (named Type A) with the extremely low APB energy was found. In contrast, no APBs are introduced in X₃Ti₂ and h-X ₂Ti because of their relatively higher energies compared with those in X₅Ti₃. As a result, the L1₀ matrix phase remains between APDs as a thin boundary phase for h-Al₂Ti.

Original language	English
Pages	231-236
Number of pages	6
Publication status	Published - 2005
Event	International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ, United States Duration: May 29 2005 → Jun 3 2005

Other

Other	International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
Country/Territory	United States
City	Phoenix, AZ
Period	5/29/05 → 6/3/05

All Science Journal Classification (ASJC) codes

Engineering(all)

Cite this

Ordering process and formation of anti-phase boundary in long-period superstructures of Al-rich TiAl single crystals. / Nakano, Takayoshi; Nagasawa, Yosuke; Umakoshi, Yukichi et al.
2005. 231-236 Paper presented at International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005, Phoenix, AZ, United States.

Research output: Contribution to conference › Paper › peer-review

Nakano, T, Nagasawa, Y, Umakoshi, Y, Hata, S, Kuwano, N, Itakura, M & Tomokiyo, Y 2005, 'Ordering process and formation of anti-phase boundary in long-period superstructures of Al-rich TiAl single crystals', Paper presented at International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005, Phoenix, AZ, United States, 5/29/05 - 6/3/05 pp. 231-236.

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title = "Ordering process and formation of anti-phase boundary in long-period superstructures of Al-rich TiAl single crystals",

abstract = "Ordering process and subsequent formation of anti-phase boundaries (APBs) in the long-period superstructures of X3Ti2 (Ga 3Ti2), X5Ti3 (Al5Ti 3) and h-X2Ti (h-Al2Ti) in -rich TiX (X=Al or Ga) single crystals were examined by a high-resolution transmission electron microscopy. Formation of the APBs is closely related to the unique units of ordered base clusters such as Ti4X, Ti3X and Ti 2X which form square, fat rhombus and lean rhombus shapes, respectively, in the (002) Ti-rich layers of the L10 matrix. The Al5Ti3-type anti-phase domains (APDs) with various sizes in diameter are introduced in Ti-62.5at.%Al crystals by appropriate heat treatment. Almost all the X5Ti3-type APBs lie on {110) and a type of APB (named Type A) with the extremely low APB energy was found. In contrast, no APBs are introduced in X3Ti2 and h-X 2Ti because of their relatively higher energies compared with those in X5Ti3. As a result, the L10 matrix phase remains between APDs as a thin boundary phase for h-Al2Ti.",

author = "Takayoshi Nakano and Yosuke Nagasawa and Yukichi Umakoshi and Satoshi Hata and Noriyuki Kuwano and Masaru Itakura and Yoshitsugu Tomokiyo",

year = "2005",

language = "English",

pages = "231--236",

note = "International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 ; Conference date: 29-05-2005 Through 03-06-2005",

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T1 - Ordering process and formation of anti-phase boundary in long-period superstructures of Al-rich TiAl single crystals

AU - Nakano, Takayoshi

AU - Nagasawa, Yosuke

AU - Umakoshi, Yukichi

AU - Hata, Satoshi

AU - Kuwano, Noriyuki

AU - Itakura, Masaru

AU - Tomokiyo, Yoshitsugu

PY - 2005

Y1 - 2005

N2 - Ordering process and subsequent formation of anti-phase boundaries (APBs) in the long-period superstructures of X3Ti2 (Ga 3Ti2), X5Ti3 (Al5Ti 3) and h-X2Ti (h-Al2Ti) in -rich TiX (X=Al or Ga) single crystals were examined by a high-resolution transmission electron microscopy. Formation of the APBs is closely related to the unique units of ordered base clusters such as Ti4X, Ti3X and Ti 2X which form square, fat rhombus and lean rhombus shapes, respectively, in the (002) Ti-rich layers of the L10 matrix. The Al5Ti3-type anti-phase domains (APDs) with various sizes in diameter are introduced in Ti-62.5at.%Al crystals by appropriate heat treatment. Almost all the X5Ti3-type APBs lie on {110) and a type of APB (named Type A) with the extremely low APB energy was found. In contrast, no APBs are introduced in X3Ti2 and h-X 2Ti because of their relatively higher energies compared with those in X5Ti3. As a result, the L10 matrix phase remains between APDs as a thin boundary phase for h-Al2Ti.

AB - Ordering process and subsequent formation of anti-phase boundaries (APBs) in the long-period superstructures of X3Ti2 (Ga 3Ti2), X5Ti3 (Al5Ti 3) and h-X2Ti (h-Al2Ti) in -rich TiX (X=Al or Ga) single crystals were examined by a high-resolution transmission electron microscopy. Formation of the APBs is closely related to the unique units of ordered base clusters such as Ti4X, Ti3X and Ti 2X which form square, fat rhombus and lean rhombus shapes, respectively, in the (002) Ti-rich layers of the L10 matrix. The Al5Ti3-type anti-phase domains (APDs) with various sizes in diameter are introduced in Ti-62.5at.%Al crystals by appropriate heat treatment. Almost all the X5Ti3-type APBs lie on {110) and a type of APB (named Type A) with the extremely low APB energy was found. In contrast, no APBs are introduced in X3Ti2 and h-X 2Ti because of their relatively higher energies compared with those in X5Ti3. As a result, the L10 matrix phase remains between APDs as a thin boundary phase for h-Al2Ti.

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T2 - International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005

Y2 - 29 May 2005 through 3 June 2005

ER -

Ordering process and formation of anti-phase boundary in long-period superstructures of Al-rich TiAl single crystals

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