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      Mechanical Behavior of Electrodeposited Bulk Nanocrystalline Fe-Ni Alloys

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          Abstract

          Bulk nanocrystalline Fe-Ni alloys with Ni content of 40-55 at.%, grain size of 12-15 nm, and hardness of 3.9-4.6 were prepared by an electrodeposition. The decrease in the hardness values as grain size decreased was discussed in terms of grain refinement effect, solid solution strengthening, and grain boundary relaxation strengthening. It was found that the change of Ni content could not significant solid solution strengthening, and there were no difference in the state of grain boundary for each sample. Micro X-ray diffraction analysis on the sample after tensile tests showed that the (200) texture was developed but full width at half maximum was not changed. This indicated the potency that the grain boundary activity would be induced by a tensile loading. The softening behavior of electrodeposited Fe–Ni alloys would be related to the transition of the dominant deformation mechanisms.

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          Most cited references26

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          Deformation-mechanism map for nanocrystalline metals by molecular-dynamics simulation.

          Molecular-dynamics simulations have recently been used to elucidate the transition with decreasing grain size from a dislocation-based to a grain-boundary-based deformation mechanism in nanocrystalline f.c.c. metals. This transition in the deformation mechanism results in a maximum yield strength at a grain size (the 'strongest size') that depends strongly on the stacking-fault energy, the elastic properties of the metal, and the magnitude of the applied stress. Here, by exploring the role of the stacking-fault energy in this crossover, we elucidate how the size of the extended dislocations nucleated from the grain boundaries affects the mechanical behaviour. Building on the fundamental physics of deformation as exposed by these simulations, we propose a two-dimensional stress-grain size deformation-mechanism map for the mechanical behaviour of nanocrystalline f.c.c. metals at low temperature. The map captures this transition in both the deformation mechanism and the related mechanical behaviour with decreasing grain size, as well as its dependence on the stacking-fault energy, the elastic properties of the material, and the applied stress level.
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            Stress-assisted discontinuous grain growth and its effect on the deformation behavior of nanocrystalline aluminum thin films

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              The effect of solid solution W additions on the mechanical properties of nanocrystalline Ni

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                mr
                Materials Research
                Mat. Res.
                ABM, ABC, ABPol (São Carlos )
                1980-5373
                November 2015
                : 18
                : suppl 1
                : 95-100
                Affiliations
                [1 ] Osaka Prefecture University Japan
                [2 ] National Institute of Advanced Industrial Science and Technology Japan
                Article
                S1516-14392015000700095
                10.1590/1516-1439.329014
                bbd8ca4f-e4f7-4d4d-aa0f-2603ee38e23f

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-1439&lng=en
                Categories
                ENGINEERING, CHEMICAL
                MATERIALS SCIENCE, MULTIDISCIPLINARY
                METALLURGY & METALLURGICAL ENGINEERING

                General materials science,General engineering
                nanocrystalline metals,electrodeposition,Fe-Ni alloys,mechanical properties,micro X-ray diffraction

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