Titanium's high-temperature elastic constants through the hcp-bcc phase transformation

Ogi, Hirotsugu; Kai, Satoshi; Ledbetter, Hassel; Tarumi, Ryuichi; Hirao, Masahiko; Takashima, Kazuki

doi:https://doi.org/10.1016/j.actamat.2004.01.002

Titanium's high-temperature elastic constants through the hcp-bcc phase transformation

Ogi, Hirotsugu; Kai, Satoshi; Ledbetter, Hassel et al.

Acta Materialia, 2004, 52(7), 2075-2080

アクセス数:499件（2025-07-22 00:17 集計）

固定URL: https://hdl.handle.net/11094/84188

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タイトル	Titanium's high-temperature elastic constants through the hcp-bcc phase transformation
著者	NRID 1000090252626 1000090252626 researchmap permalink read0042771 read0042771 Scopus Author ID 35563683500 35563683500 著者名 Ogi, Hirotsugu
	著者名 Kai, Satoshi
	著者名 Ledbetter, Hassel
	NRID 1000030362643 1000030362643 researchmap permalink ryuichitarumi ryuichitarumi Scopus Author ID 6602531674 6602531674 著者名 Tarumi, Ryuichi
	NRID 1000080112027 1000080112027 著者名 Hirao, Masahiko
	NRID 1000060163193 1000060163193 著者名 Takashima, Kazuki
キーワード等	Acoustic methods
	Elastic behavior
	Martensitic phase transformation
	Strain ageing
	Titanium
抄録	The five independent elastic constants of hexagonal monocrystal titanium were determined up to the phase-transformation temperature, and the two isotropic elastic constants of polycrystalline titanium were determined beyond, up to 1300 K. Anomalous temperature dependences were observed just below the phase-transformation temperature: C11 and C66 increase with increasing temperature whereas C33 and C44 remarkably decrease, for example. To determine the Cij, we used the free-vibration resonance frequencies obtained by electromagnetic acoustic resonance. After the phase transformation, the resonance frequencies changed little with the temperature increase, showing that the bcc-phase elastic constants change little with temperature. The polycrystalline elastic constants remained unchanged up to 1300 K after the phase transformation. The anomalous temperature dependence near the transformation is interpreted in terms of the small c/a ratio of the hcp phase and change of the atomic distances to meet the Burgers lattice relationship. Temperature-insensitive elastic constants in the bcc phase suggest the stabilizing of the bcc phase with increasing temperature. © 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
出版者	Elsevier Ltd
収録物名	Acta Materialia
巻(号)	52(7)
ページ	2075-2080
刊行年月	2004-01-25
言語	英語
ハンドルURL	https://hdl.handle.net/11094/84188
PISSN	13596454
NCID	AA11521780
NCID	AA1106787X
関連情報 (isVersionOf)	DOI (出版社版) https://doi.org/10.1016/j.actamat.2004.01.002
アクセス権	open access
権利情報	© 2004 Acta Materialia Inc. Published by Elsevier Ltd. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
出版タイプ	Accepted Manuscript
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Acta Materialia. 2004, 52(7), p. 2075-2080
DC.title	Titanium's high-temperature elastic constants through the hcp-bcc phase transformation
DC.creator	Ogi, Hirotsugu
	Kai, Satoshi
	Ledbetter, Hassel
	Tarumi, Ryuichi
	Hirao, Masahiko
	Takashima, Kazuki
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2004-01-25
DC.identifier	https://doi.org/10.1016/j.actamat.2004.01.002
DC.subject	Acoustic methods
	Elastic behavior
	Martensitic phase transformation
	Strain ageing
	Titanium
DCTERMS.abstract	The five independent elastic constants of hexagonal monocrystal titanium were determined up to the phase-transformation temperature, and the two isotropic elastic constants of polycrystalline titanium were determined beyond, up to 1300 K. Anomalous temperature dependences were observed just below the phase-transformation temperature: C11 and C66 increase with increasing temperature whereas C33 and C44 remarkably decrease, for example. To determine the Cij, we used the free-vibration resonance frequencies obtained by electromagnetic acoustic resonance. After the phase transformation, the resonance frequencies changed little with the temperature increase, showing that the bcc-phase elastic constants change little with temperature. The polycrystalline elastic constants remained unchanged up to 1300 K after the phase transformation. The anomalous temperature dependence near the transformation is interpreted in terms of the small c/a ratio of the hcp phase and change of the atomic distances to meet the Burgers lattice relationship. Temperature-insensitive elastic constants in the bcc phase suggest the stabilizing of the bcc phase with increasing temperature. © 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
DC.rights	© 2004 Acta Materialia Inc. Published by Elsevier Ltd. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
DC.format	84188
citation_title	Titanium's high-temperature elastic constants through the hcp-bcc phase transformation
citation_author	Ogi, Hirotsugu
	Kai, Satoshi
	Ledbetter, Hassel
	Tarumi, Ryuichi
	Hirao, Masahiko
	Takashima, Kazuki
citation_publisher	Elsevier Ltd
citation_language	英語
citation_date	2004-01-25
citation_journal_title	Acta Materialia
citation_volume	52
citation_issue	7
citation_firstpage	2075
citation_lastpage	2080
citation_doi	https://doi.org/10.1016/j.actamat.2004.01.002
citation_public_url	https://hdl.handle.net/11094/84188

Titanium's high-temperature elastic constants through the hcp-bcc phase transformation

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