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Gradient structure produced by three roll planetary milling: numerical simulation and microstructural observations
journal contribution
posted on 2015-07-05, 00:00 authored by Y Li Wang, A Molotnikov, M Diez, Rimma LapovokRimma Lapovok, H E Kim, J Tao Wang, Y EstrinIn this study a gradient grain structure was produced by processing rod billets through three roll planetary milling (also known as PSW process). This kind of gradient structure is reported to provide an excellent combination of strength and ductility owing to an ultrafine-grained surface layer and a coarse-grained interior of the billet. Specifically, copper rod samples were subjected to up to six passes of PSW at room temperature. To study the evolution of the microstructure during the deformation, microhardness measurements and Electron Backscatter Diffraction (EBSD) analysis were performed after one, three and six passes. Additionally, the distributions of the equivalent stress during PSW and the equivalent strain after processing were studied by finite element analysis using the commercial software QFORM. The results showed the efficacy of PSW as a means of imparting a gradient ultrafine-grained structure to copper rods. A good correlation between the simulated equivalent strain distribution and the measured microhardness distribution was demonstrated.
History
Journal
Materials science and engineering aVolume
639Pagination
165 - 172Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0921-5093eISSN
1873-4936Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2015, ElsevierUsage metrics
Keywords
Copper rodsGradient structurePSWThree roll planetary millingUltrafine grainsScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringScience & Technology - Other TopicsMaterials ScienceINCIDENTAL DISLOCATION BOUNDARIESGRAIN-REFINEMENTMECHANICAL-PROPERTIESPLASTIC-DEFORMATIONCOPPER TUBESTRAINEVOLUTIONECAPALUMINUMSIZEMechanical Engineering
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