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2005 | 107 | 6 | 933-946
Article title

Size Dependent Acoustical Properties of bcc Metal

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Content
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Languages of publication
EN
Abstracts
EN
The ultrasonic attenuation is evaluated at 300 K along [100], [110], and [111] directions for the characterization of bcc metal Ta. The size of the metal is considered in nanorange. Ultrasonic velocity, Gr√ľneisen parameter and acoustic coupling constant that depend on second and third order elastic constants are calculated for determination of ultrasonic attenuation coefficient. Second and third order elastic constants of the bcc metal Ta at nanoscale at 300 K are also calculated starting with only two basic parameters. For the information about defects at nanoscale, the dislocation drag coefficients are calculated for the metal at different size along [100] orientation. The ultrasonic attenuation increases with the size of material as the size variation of the thermal conductivity and the thermal relaxation time. There is significant increase in the attenuation up to 150 nm.
Keywords
EN
Year
Volume
107
Issue
6
Pages
933-946
Physical description
Dates
published
2005-06
received
2004-12-13
(unknown)
2005-04-06
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv107n605kz
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