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

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Identifier to cite or link to this item: https://hdl.handle.net/11094/84189

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Title
Acoustic study of kinetics of vacancy diffusion toward dislocations in aluminum
Creator
NRID
1000090252626 1000090252626
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Scopus Author ID
35563683500 35563683500
CreatorName
Ogi, Hirotsugu
CreatorName
Tsujimoto, Akihiro
CreatorName
Nishimura, Shigeyuki
NRID
1000080112027 1000080112027
CreatorName
Hirao, Masahiko
Subject
Acoustic methods
Aluminum
Diffusion
Electromagnetic acoustic resonance
Vacancies
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.
Publisher
Elsevier Ltd
Source Title
Acta Materialia
Volume (Issue)
53(2)
Page
513-517
Date of Issued
2004-11-17
Language
English
Handle URL
https://hdl.handle.net/11094/84189
PISSN
13596454
NCID
AA11521780
AA1106787X
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1016/j.actamat.2004.10.007
Access Rights
open access
CopyRight
© 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.
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article