On the processing of dense hetero-nanostructured metallic materials for improved strength / ductility balance by ecae and sps methods

Grosdidier, T and Ji, G and Llorca, N (2011) On the processing of dense hetero-nanostructured metallic materials for improved strength / ductility balance by ecae and sps methods. In: VI International Conference on Mechanochemistry and Mechanical Alloying (INCOME 2008), 1-4 December 2008, CSIR-NML, Jamshedpur.

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Abstract

This paper has examined some recent findings concerning the processing of fully dense hetero-nanostructured materials (i.e. consisting of nano, ultrafine and micrometric grains) which can be produced by using the interplay between heavy deformation and recrystallization. By plastic deformation of bulk materials, an improved strength/ductility balance can be obtained directly by imparting high strain deformation (by ECAE) until the occurrence of recrystallization. Using a powder metallurgy route, the strong potential of electric field assisted sintering (ECAS) techniques for producing multi-scale microstructures when a milled powder is used is demonstrated. In this case, in addition to modifying the classic processing parameters (time/temperature of SPS), altering the nature of the milled powder - by Y2O3 addition during the milling stage - is also a good way to delay the onset of recrystallization and, thereby, increase the fraction of ultrafine grains.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:http://eprints.nmlindia.org/5015
Uncontrolled Keywords:Electric current assisted sintering (ECAS), Spark plasma sintering (SPS), Mechanical milling (MA), Equal channel angular extrusion/pressing (ECAE/ECAP), Nanostructured metals (Hetero-nanostructure)
Divisions:Metal Extraction and Forming
ID Code:5015
Deposited By:INVALID USER
Deposited On:19 Apr 2012 11:43
Last Modified:19 Apr 2012 11:43
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