The Effect of Dispersoids and Processing Variables on Grain Refinement of Aluminium Alloys Deformed by ECAE

Abstract:

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The effect of fine, non-shearable, dispersoids on the grain refinement of aluminium alloys, severely deformed by ECAE, has been studied using a model Al-0.2%Sc alloy, during deformation by Routes A and BC (+90degrees rotation) using a 120°, or 90°, die. The microstructure in the dispersoid-containing alloy was compared to a single-phase alloy using high resolution EBSD analysis. With Route A the presence of fine dispersoids was found to significantly retard the development of new high-angle grain boundaries and the formation of a fine grain structure, by homogenising slip and inhibiting microshear bands. This difference was greatly enhanced, using Route BC. Similar results were obtained with the two die angles, but with Route A refinement tended to be slightly less effective when using the 90° die.

Info:

Periodical:

Solid State Phenomena (Volume 114)

Edited by:

Witold Lojkowski and John R. Blizzard

Pages:

151-158

DOI:

10.4028/www.scientific.net/SSP.114.151

Citation:

M. Berta and P. B. Prangnell, "The Effect of Dispersoids and Processing Variables on Grain Refinement of Aluminium Alloys Deformed by ECAE", Solid State Phenomena, Vol. 114, pp. 151-158, 2006

Online since:

July 2006

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Price:

$35.00

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