Ultrasonic Spectroscopy and X-Ray Diffraction Study for ARB Aluminum

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It has been reported that accumulative-roll-bonded (ARB) aluminum having ultrafine grains shows an intriguing mechanical character that it is hardened by annealing and contrarily softened by deformation. In order to understand the mechanism of such a peculiar phenomenon, we have investigated the dislocation damping with ultrasonic spectroscopy and total amount of dislocations with the X-ray diffraction measurement. From the present measurements, we have found that the dislocations introduced by the ARB process are tangled but can be released with a large stress. Such dislocations accumulated in ultrafine grains play a significant role in the plastic deformation.

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Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

937-940

DOI:

10.4028/www.scientific.net/MSF.561-565.937

Citation:

K. Hirai et al., "Ultrasonic Spectroscopy and X-Ray Diffraction Study for ARB Aluminum", Materials Science Forum, Vols. 561-565, pp. 937-940, 2007

Online since:

October 2007

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$35.00

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