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

M. Berta; Phil B. Prangnell

doi:10.4028/www.scientific.net/SSP.114.151

Paper Titles

Microstructural Refinement under High Plastic Strain Rates during Hydrostatic Extrusion
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Deformation-Induced Nanocrystallization in Al-Rich Metallic Glasses
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Phase Transformations in Pearlitic Steels Induced by Severe Plastic Deformation
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The Influence of Hydrostatic Extrusion on the Microstructure of 6082 Aluminium Alloy
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The Effect of Dispersoids and Processing Variables on Grain Refinement of Aluminium Alloys Deformed by ECAE
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Evolution of Precipitate Coarsening Reaction in a Nanostructured Fe-Ni-Mn Maraging Alloy
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Processing and Characterization of AlCu Aluminium Alloys by the ECAE Method
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Influence of Severe Plastic Deformation on the PLC Effect and Mechanical Properties in Al 5XXX Alloy
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SPD Processed Alloys as Efficient Vacancy-Hydrogen Systems
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HomeSolid State PhenomenaSolid State Phenomena Vol. 114The Effect of Dispersoids and Processing Variables...

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

Abstract:

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.

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Periodical:

Solid State Phenomena (Volume 114)

Pages:

151-158

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.114.151

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Online since:

July 2006

Authors:

M. Berta, Phil B. Prangnell

Keywords:

Al-Sc Alloy, Dispersoid, Equal Channel Angular Extrusion (ECAE), Grain Refinement, Processing Route, Severe Deformation

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