Lamellar orientation control of Ti-48Al PST cyrstal by unidirectional solidification

M. Takeyama; Y. Yamamoto; H. Morishima; K. Koike; S. Y. Chang; T. Matsuo

doi:10.1016/S0921-5093(01)01493-9

Lamellar orientation control of Ti-48Al PST cyrstal by unidirectional solidification

M. Takeyama, Y. Yamamoto, H. Morishima, K. Koike, S. Y. Chang, T. Matsuo

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Control of lamellar orientation in unidirectionally solidified Ti-48Al PST crystals has been attempted by an optical floating zone method using various seed crystals of Ti-(48-57)Al alloys. Regardless of the seed crystals, the Ti-48Al PST crystals can be grown without any difficulty. However, the lamellar orientation can never reproducibly be controlled by using any seeds but single crystal of Ti-57Al. In case of the 48Al PST seed, polycrystallization due to γ → α phase transformation takes place in heating to melt. The seeds with composition range of a peritectic reaction (L + α → γ) to occur in melting exhibit a cellular liquid/solid interface, resulting in new grains there. In these cases, the grown crystal follows an orientation of one of the newly formed grains. The single crystal seed of Ti-57Al exhibits a flat liquid/solid interface in melting (γ → γ + L) even after making contact with 48Al alloy to grow, and the grown crystal follows the seed orientation. It is concluded that composition travel to skip the peritectic reaction (L + α → γ) using γ single phase seed makes the control of lamellar orientation of PST crystals possible.

Original language	English
Pages (from-to)	7-12
Number of pages	6
Journal	Materials Science and Engineering: A
Volume	329-331
DOIs	https://doi.org/10.1016/S0921-5093(01)01493-9
State	Published - Jun 2002
Externally published	Yes

Funding

This research is supported by the research grant on ‘Research for the Future Program’ from Japan Society for the Promotion of Science (96R12301), and in part by a grant-in-aid (11875149) for Scientific Research from Ministry of Education, Science and Culture, Japan.

Funders	Funder number
Japan Society for the Promotion of Science	96R12301, 11875149
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology

Keywords

Gamma single-phase single crystal
Lamellar orientation control
Optical floating zone method
Seed crystal
Ti-48Al PST crystal
Unidirectional solidification

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10.1016/S0921-5093(01)01493-9

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title = "Lamellar orientation control of Ti-48Al PST cyrstal by unidirectional solidification",

abstract = "Control of lamellar orientation in unidirectionally solidified Ti-48Al PST crystals has been attempted by an optical floating zone method using various seed crystals of Ti-(48-57)Al alloys. Regardless of the seed crystals, the Ti-48Al PST crystals can be grown without any difficulty. However, the lamellar orientation can never reproducibly be controlled by using any seeds but single crystal of Ti-57Al. In case of the 48Al PST seed, polycrystallization due to γ → α phase transformation takes place in heating to melt. The seeds with composition range of a peritectic reaction (L + α → γ) to occur in melting exhibit a cellular liquid/solid interface, resulting in new grains there. In these cases, the grown crystal follows an orientation of one of the newly formed grains. The single crystal seed of Ti-57Al exhibits a flat liquid/solid interface in melting (γ → γ + L) even after making contact with 48Al alloy to grow, and the grown crystal follows the seed orientation. It is concluded that composition travel to skip the peritectic reaction (L + α → γ) using γ single phase seed makes the control of lamellar orientation of PST crystals possible.",

keywords = "Gamma single-phase single crystal, Lamellar orientation control, Optical floating zone method, Seed crystal, Ti-48Al PST crystal, Unidirectional solidification",

author = "M. Takeyama and Y. Yamamoto and H. Morishima and K. Koike and Chang, {S. Y.} and T. Matsuo",

year = "2002",

month = jun,

doi = "10.1016/S0921-5093(01)01493-9",

language = "English",

volume = "329-331",

pages = "7--12",

journal = "Materials Science and Engineering: A",

issn = "0921-5093",

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T1 - Lamellar orientation control of Ti-48Al PST cyrstal by unidirectional solidification

AU - Takeyama, M.

AU - Yamamoto, Y.

AU - Morishima, H.

AU - Koike, K.

AU - Chang, S. Y.

AU - Matsuo, T.

PY - 2002/6

Y1 - 2002/6

N2 - Control of lamellar orientation in unidirectionally solidified Ti-48Al PST crystals has been attempted by an optical floating zone method using various seed crystals of Ti-(48-57)Al alloys. Regardless of the seed crystals, the Ti-48Al PST crystals can be grown without any difficulty. However, the lamellar orientation can never reproducibly be controlled by using any seeds but single crystal of Ti-57Al. In case of the 48Al PST seed, polycrystallization due to γ → α phase transformation takes place in heating to melt. The seeds with composition range of a peritectic reaction (L + α → γ) to occur in melting exhibit a cellular liquid/solid interface, resulting in new grains there. In these cases, the grown crystal follows an orientation of one of the newly formed grains. The single crystal seed of Ti-57Al exhibits a flat liquid/solid interface in melting (γ → γ + L) even after making contact with 48Al alloy to grow, and the grown crystal follows the seed orientation. It is concluded that composition travel to skip the peritectic reaction (L + α → γ) using γ single phase seed makes the control of lamellar orientation of PST crystals possible.

AB - Control of lamellar orientation in unidirectionally solidified Ti-48Al PST crystals has been attempted by an optical floating zone method using various seed crystals of Ti-(48-57)Al alloys. Regardless of the seed crystals, the Ti-48Al PST crystals can be grown without any difficulty. However, the lamellar orientation can never reproducibly be controlled by using any seeds but single crystal of Ti-57Al. In case of the 48Al PST seed, polycrystallization due to γ → α phase transformation takes place in heating to melt. The seeds with composition range of a peritectic reaction (L + α → γ) to occur in melting exhibit a cellular liquid/solid interface, resulting in new grains there. In these cases, the grown crystal follows an orientation of one of the newly formed grains. The single crystal seed of Ti-57Al exhibits a flat liquid/solid interface in melting (γ → γ + L) even after making contact with 48Al alloy to grow, and the grown crystal follows the seed orientation. It is concluded that composition travel to skip the peritectic reaction (L + α → γ) using γ single phase seed makes the control of lamellar orientation of PST crystals possible.

KW - Gamma single-phase single crystal

KW - Lamellar orientation control

KW - Optical floating zone method

KW - Seed crystal

KW - Ti-48Al PST crystal

KW - Unidirectional solidification

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DO - 10.1016/S0921-5093(01)01493-9

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SN - 0921-5093

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EP - 12

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Lamellar orientation control of Ti-48Al PST cyrstal by unidirectional solidification

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