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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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.
|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
|Date Deposited:||18 May 2009|
|Last Modified:||21 Aug 2013 13:13|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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