File(s) under permanent embargo
Effect of heat treatment on diffusion, internal friction, microstructure and mechanical properties of ultra-fine-grained nickel severely deformed by equal-channel angular pressing
journal contribution
posted on 2015-01-01, 00:00 authored by S V Divinski, G Reglitz, I S Golovin, M Peterlechner, Rimma Lapovok, Y Estrin, G WildeSevere plastic deformation via equal-channel angular pressing was shown to induce characteristic ultra-fast diffusion paths in Ni (Divinski et al., 2011). The effect of heat treatment on these paths, which were found to be represented by deformation-modified general high-angle grain boundaries (GBs), is investigated by accurate radiotracer self-diffusion measurements applying the 63Ni isotope. Redistribution of free volume and segregation of residual impurities caused by the heat treatment triggers relaxation of the diffusion paths. A correlation between the GB diffusion kinetics, internal friction, microstructure evolution and microhardness changes is established and analyzed in detail. A phenomenological model of diffusion enhancement in deformation-modified GBs is proposed.
History
Journal
Acta materialiaVolume
82Pagination
11 - 21Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
1359-6454eISSN
1873-2453Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2015, ElsevierUsage metrics
Categories
Keywords
ECAPGrain boundary diffusionInternal frictionMicrohardnessSPDScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceSEVERE PLASTIC-DEFORMATIONBOUNDARY DIFFUSIONSELF-DIFFUSIONNANOSTRUCTURED METALSCOPPERNICURECRYSTALLIZATIONDISLOCATIONSMechanical EngineeringCondensed Matter Physics
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC