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Bimodal grain size distributions in UFG materials produced by SPD - their evolution and effect on the fatigue and monotonic strength properties
journal contribution
posted on 2011-01-01, 00:00 authored by M Korn, Rimma Lapovok, A Böhner, H W Höppel, H MughrabiIn ultrafine-grained (UFG) materials produced by severe plastic deformation (SPD) techniques such as ECAP (equal channel angular pressing), bimodal grain size distributions have been observed under different circumstances, for example shortly after ECAP, after rest or anneal and/or after mild cyclic deformation at rather low homologous temperature. It has been shown that the mechanical monotonic and fatigue properties of some UFG materials can be modified (sometimes enhanced) by introducing a bimodal grain size distribution by a mild annealing treatment which leads, in some cases, to a good combination of strength and ductility. Here, the conditions under which bimodal grain size distributions evolve by (adiabatic) heating during ECAP and during subsequent annealing or cyclic deformation will be explored, and the effects on the mechanical properties, as studied by the authors and as reported so far in the literature, will be reviewed and discussed. In particular, the role of temperature rise during ECAP will be considered in some detail.
History
Journal
Kovove materialyVolume
49Issue
1Pagination
51 - 63Publisher
Institute of Materials and Machine MechanicsLocation
Bratislava, Slovak RepublicPublisher DOI
ISSN
0023-432XLanguage
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2011, Institute of Materials and Machine MechanicsUsage metrics
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No categories selectedKeywords
Science & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceUFGultrafine-grained microstructurebimodal grain size distributionfatigue life enhancementgrain coarseningECAP temperature riseTHERMAL-STABILITYTEMPERATURE RISENANOCRYSTALLINEMICROSTRUCTUREDEFORMATIONMETALSDUCTILITYCOPPERENHANCE
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