Acoustic study of kinetics of vacancy diffusion toward dislocations in aluminum

Ogi, Hirotsugu; Tsujimoto, Akihiro; Nishimura, Shigeyuki; Hirao, Masahiko

doi:https://doi.org/10.1016/j.actamat.2004.10.007

Acoustic study of kinetics of vacancy diffusion toward dislocations in aluminum

Ogi, Hirotsugu; Tsujimoto, Akihiro; Nishimura, Shigeyuki et al.

Acta Materialia, 2004, 53(2), 513-517

アクセス数:263件（2025-08-23 10:28 集計）

固定URL: https://hdl.handle.net/11094/84189

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タイトル	Acoustic study of kinetics of vacancy diffusion toward dislocations in aluminum
著者	NRID 1000090252626 1000090252626 researchmap permalink read0042771 read0042771 Scopus Author ID 35563683500 35563683500 著者名 Ogi, Hirotsugu
	著者名 Tsujimoto, Akihiro
	著者名 Nishimura, Shigeyuki
	NRID 1000080112027 1000080112027 著者名 Hirao, Masahiko
キーワード等	Acoustic methods
	Aluminum
	Diffusion
	Electromagnetic acoustic resonance
	Vacancies
抄録	Using ultrasonic shear waves, we study the kinetics of migration of vacancy to dislocations in aluminum. Ultrasonic attenuation is sensitive to the effective dislocation length, which is shortened by the segregation of point defects. Two principal measurements were done: (i) measurement of temperature dependence of decay behavior of attenuation after elastic deformation; (ii) continuous measurement of attenuation of a specimen quenched from 573 K to cold-water and then to liquid-nitrogen temperatures. The specimens were polycrystalline and monocrystal aluminum with 99.995% purity. The former measurement provided us with the activation energy 0.28 eV for migration of dominant point defects through the Granato-Hikata-Lücke theory. The latter measurement informed us of the kinetics of vacancy: the attenuation coefficient rapidly decreased twice at 125 and 250 K, corresponding to activation energies 0.28 and 0.61 eV for migration, respectively. Thus, the same mechanism occurs for the attenuation change after elastic deformation and at 125 K. after quenching. We attributed the 0.28-eV migration as fast diffusion of vacancy along dislocations. The 0.61-eV migration is consistent with the bulk diffusion of vacancy in aluminum. Throughout this study, the electromagnetic acoustic resonance method was used for making noncontacting and highly accurate measurement of attenuation. © 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
出版者	Elsevier Ltd
収録物名	Acta Materialia
巻(号)	53(2)
ページ	513-517
刊行年月	2004-11-17
言語	英語
ハンドルURL	https://hdl.handle.net/11094/84189
PISSN	13596454
NCID	AA11521780
NCID	AA1106787X
関連情報 (isVersionOf)	DOI (出版社版) https://doi.org/10.1016/j.actamat.2004.10.007
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, 53(2), p. 513-517
DC.title	Acoustic study of kinetics of vacancy diffusion toward dislocations in aluminum
DC.creator	Ogi, Hirotsugu
	Tsujimoto, Akihiro
	Nishimura, Shigeyuki
	Hirao, Masahiko
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2004-11-17
DC.identifier	https://doi.org/10.1016/j.actamat.2004.10.007
DC.subject	Acoustic methods
	Aluminum
	Diffusion
	Electromagnetic acoustic resonance
	Vacancies
DCTERMS.abstract	Using ultrasonic shear waves, we study the kinetics of migration of vacancy to dislocations in aluminum. Ultrasonic attenuation is sensitive to the effective dislocation length, which is shortened by the segregation of point defects. Two principal measurements were done: (i) measurement of temperature dependence of decay behavior of attenuation after elastic deformation; (ii) continuous measurement of attenuation of a specimen quenched from 573 K to cold-water and then to liquid-nitrogen temperatures. The specimens were polycrystalline and monocrystal aluminum with 99.995% purity. The former measurement provided us with the activation energy 0.28 eV for migration of dominant point defects through the Granato-Hikata-Lücke theory. The latter measurement informed us of the kinetics of vacancy: the attenuation coefficient rapidly decreased twice at 125 and 250 K, corresponding to activation energies 0.28 and 0.61 eV for migration, respectively. Thus, the same mechanism occurs for the attenuation change after elastic deformation and at 125 K. after quenching. We attributed the 0.28-eV migration as fast diffusion of vacancy along dislocations. The 0.61-eV migration is consistent with the bulk diffusion of vacancy in aluminum. Throughout this study, the electromagnetic acoustic resonance method was used for making noncontacting and highly accurate measurement of attenuation. © 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	84189
citation_title	Acoustic study of kinetics of vacancy diffusion toward dislocations in aluminum
citation_author	Ogi, Hirotsugu
	Tsujimoto, Akihiro
	Nishimura, Shigeyuki
	Hirao, Masahiko
citation_publisher	Elsevier Ltd
citation_language	英語
citation_date	2004-11-17
citation_journal_title	Acta Materialia
citation_volume	53
citation_issue	2
citation_firstpage	513
citation_lastpage	517
citation_doi	https://doi.org/10.1016/j.actamat.2004.10.007
citation_public_url	https://hdl.handle.net/11094/84189

Acoustic study of kinetics of vacancy diffusion toward dislocations in aluminum

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