Cyclic deformation of nanocrystalline and ultrafine-grained nickel |
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| Authors: | S Cheng J Xie AD Stoica X-L Wang JA Horton DW Brown H Choo PK Liaw |
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| Affiliation: | 1. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA;2. Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;3. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;4. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;5. Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, NM 87545, USA |
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| Abstract: | 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. |
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