ISSN:
1013-9826
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:
Manufacturing bulk nanostructured materials with least grain growth from initial powdersis challenging because of the bottle neck of bottom-up methods using the conventional powdermetallurgy of compaction and sintering. In this study, bottom-up type powder metallurgy processingand top-down type SPD (Severe Plastic Deformation) approaches were combined in order to achieveboth full density and grain refinement of metallic powders. ECAP (Equal-Channel Angular Pressing),one of the most promising processes in SPD, was used for the powder consolidation method. Forunderstanding the ECAP process, investigating the powder density as well as internal stress, strainand strain rate distribution is crucial. We investigated the consolidation and plastic deformation of themetallic powders during ECAP using the finite element simulations. Almost independent behavior ofpowder densification in the entry channel and shear deformation in the main deformation zone wasfound by the finite element method in conjunction with a pressure dependent material yield model.Effects of processing parameters on densification and density distributions were investigated
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.173.pdf
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