ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
An analytical model describing the deformation behaviour of copper during thehigh-pressure torsion (HPT) processing is presented. The model was developed on themicrostructural basis where the material is partitioned in two ‘phases’, the dislocationdensities in cell walls and the dislocation densities cell interior, entering the model as scalarinternal variables. The resulting ’phase mixture’ model is combined with strain gradienttheory to account for strain non-uniformity inherent in SPD.It was demonstrated that gradient plasticity model is capable of describing the experimentallyobserved trends and accounting for a homogenisation of the accumulated shear strain acrossthe HPT sample. The predictions of the model with respect to the ultrafine grain sizeproduced by HPT and evolution of dislocation densities are in good agreement withexperimental results reported by other research groups
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.1051.pdf
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