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The Effect of Dispersoids and Processing Variables on Grain Refinement of Aluminium Alloys Deformed by ECAE
M. Berta and P.B. Prangnell
J. Solid State Phenomena. 2006;114:151.
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Abstract
The effect of fine, non-shearable, dispersoids on the grain refinement of aluminiumalloys, severely deformed by ECAE, has been studied using a model Al-0.2%Sc alloy, duringdeformation 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 tosignificantly 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.