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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), pp. 5796-5811. (doi:10.1016/j.actamat.2009.08.006).

Record type: Article


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.

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e-pub ahead of print date: September 2009
Published date: November 2009
Keywords: severe plastic deformation (spd), equal channel angular pressing (ecap), dislocation mobility, aluminium alloys, grain size, dislocation density, dynamic recovery, misorientation angle
Organisations: Engineering Mats & Surface Engineerg Gp


Local EPrints ID: 66237
ISSN: 1359-6454
PURE UUID: bda02667-bb4c-4075-8bb1-538260bb1667

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Date deposited: 18 May 2009
Last modified: 19 Jul 2017 00:26

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Author: M.J. Starink
Author: X.G. Qiao
Author: J. Zhang
Author: N. Gao

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