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A model of grain fragmentation based on lattice curvature
journal contribution
posted on 2010-03-01, 00:00 authored by L S Tóth, Y Estrin, Rimma LapovokRimma Lapovok, C GuA new model is proposed that aims to capture within a single modelling frame all the main microstructural features of a severe plastic deformation process. These are: evolution of the grain size distribution, misorientation distribution, crystallographic texture and the strain-hardening of the material. The model is based on the lattice curvature that develops in all deformed grains. The basic assumption is that lattice rotation within an individual grain is impeded near the grain boundaries by the constraining effects of the neighbouring grains, which gives rise to lattice curvature. On that basis, a fragmentation scheme is developed which is integrated in the Taylor viscoplastic polycrystal model. Dislocation density evolution is traced for each grain, which includes the contribution of geometrically necessary dislocations associated with lattice curvature. The model is applied to equal-channel angular pressing. The role of texture development is shown to be an important element in the grain fragmentation process. Results of this modelling give fairly precise predictions of grain size and grain misorientation distribution. The crystallographic textures are well reproduced and the strength of the material is also reliably predicted based on the modelling of dislocation density evolution coupled with texture development.
History
Journal
Acta materialiaVolume
58Issue
5Pagination
1782 - 1794Publisher
ElsevierLocation
Oxford, Eng.Publisher DOI
ISSN
1359-6454Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2009, Acta MaterialiaUsage metrics
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Keywords
Science & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceGrain fragmentationSevere plastic deformationTexture developmentStrain-hardeningMisorientation distributionCHANNEL ANGULAR EXTRUSIONSEVERE PLASTIC-DEFORMATIONORIENTATION GRADIENTSDISLOCATION DENSITYSUBDIVISIONALUMINUMTEXTUREBOUNDARIESEVOLUTIONDISORIENTATIONMechanical EngineeringCondensed Matter Physics
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