Journal
ACTA MATERIALIA
Volume 57, Issue 4, Pages 1272-1280Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.11.011
Keywords
Ultrafine-grained; Cyclic deformation; Neutron diffraction; Cyclic hardening/softening; Lattice strain
Funding
- NSF [DMR-0421219, DMR-0231320]
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, US Department of Energy [DE-AC05-00OR22725, DE-AC52-06NA25396]
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The cyclic deformation behavior Of ultrafine-grained (UFG) Ni samples synthesized by the electrodeposition method was studied. Different from those made by severely plastic deformation, the UFG samples used in this study are characterized by large-angle grain boundaries. Behaviors from nanocrystalline Ni and coarse-grained Ni samples were compared with that Of Ultrafine-grained Ni. With in situ neutron diffraction. unusual evolutions of residual lattice strains as well as cyclic hardening and softening behavior were demonstrated during the cyclic deformation. The microstructural changes investigated by TEM are discussed with respect to the unusual lattice strain and cyclic hardening/softening. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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