Predicting grain refinement by cold severe plastic deformation in alloys using volume average dislocation generation


Starink, M.J., Qiao, X.G., Zhang, J. and Gao, N. (2009) Predicting grain refinement by cold severe plastic deformation in alloys using volume average dislocation generation. Acta Materialia, 57, (19), 5796-5811. (doi:10.1016/j.actamat.2009.08.006).

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Description/Abstract

The grain refinement during severe plastic deformation (SPD) is predicted using volume averaged amount of dislocations generated. The model incorporates a new expansion of a model for hardening in the parabolic hardening regime, in which the work hardening depends on the effective dislocation free path related to the presence of non shearable particles and solute-solute nearest neighbour interactions. These two mechanisms give rise to dislocation multiplication in the form of generation of geometrically necessary dislocations and dislocations induced by local bond energies. The model predicts the volume averaged amount of dislocations generated and considers that they distribute to create cell walls and move to existing cell walls/grain boundaries where they increase in the grain boundary misorientation. The model predicts grain sizes of Al alloys subjected to SPD over 2 orders of magnitude. The model correctly predicts the considerable influence of Mg content and content of non-shearable particles on the grain refinement during SPD.

Item Type: Article
ISSNs: 1359-6454 (print)
Keywords: severe plastic deformation (spd), equal channel angular pressing (ecap), dislocation mobility, aluminium alloys, grain size, dislocation density, dynamic recovery, misorientation angle
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 66237
Date Deposited: 18 May 2009
Last Modified: 28 Mar 2014 15:24
Projects:
MEMS COMPONENTS FORMED FROM NANOSTRUCTURAL METALS
Funded by: EPSRC (EP/D00313X/1)
Led by: Nong Gao
1 August 2006 to 31 October 2009
URI: http://eprints.soton.ac.uk/id/eprint/66237

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