Synthesis of bulk nanocrystalline nickel by pulsed electrodeposition

El-Sherik, A.M.; Erb, U.

doi:10.1007/bf00356715

Cited by 307 publications

(159 citation statements)

References 16 publications

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“…bath composition, temperature, pH, etc. Extensive studies have been conducted on the use of pulse plating [263][264][265][266][267][268][269][270][271][272][273] and DC plating for these purposes [274][275][276]. Pulse plating is particularly attractive because it can be used to produce finer-grained structures and coatings that are not obtainable by DC plating.…”

Section: Electrodepositionmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

842

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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Section: Electrodepositionmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

842

345

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“…It is clear from the brightfield and dark-field micrographs that these electrodeposits have a nanocrystalline structure with an average grain size of 15 nm and negligible porosity as confirmed by density measurements. [25] The selected-area electron diffraction (SAED) patterns indicate that the asdeposited Co-20.6at%Ni and Co-31.0at%Ni are mainly in the hcp phase with the diffraction rings from center to outwards corresponding to ε(100), ε(002), ε(101), ε(102), ε(110) and ε(103), respectively. On the contrary, Co-48.0at%Ni contains the fcc phase with the diffraction rings corresponding to γ (111), γ (200), γ (220), γ (311) and γ (222).…”

Section: Methodsmentioning

confidence: 99%

Strain-Induced Reverse Phase Transformation in Nanocrystalline Co-Ni Alloys

Jin

et al. 2014

Materials Research Letters

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A strain-induced reverse phase transformation from a hexagonal close-packed phase to a face-centered cubic phase was observed under tension at room temperature in electrodeposited nanocrystalline Co-Ni alloys with an average grain size of 15 nm. Such reverse phase transformation was previously observed only on heating. Investigation by transmission electron microscopy suggests a close relationship between the reverse phase transformation and grain growth during the tensile deformation.

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“…An alternative to obtain theoretical dense materials is the pulsed electrodeposition method developed by Erb and El-Sherik which yields nanocrystalline strips, however, only with thicknesses of several hundred microns. [9] The bottom-up approach includes many different techniques which are based on liquid or gas phase processes. Classically, wet chemical processes such as precipitation and sol-gel have been employed to obtain nanoparticles, however, with the disadvantage of severe agglomeration.…”

Section: Synthesismentioning

confidence: 99%

Unique Features and Properties of Nanostructured Materials

Hahn¹

2003

Adv Eng Mater

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In this introductory paper an attempt is made to give an overview of the area of nanostructured "materials irrespective of the synthesis process. The various microstructural features such as clusters or isolated nanoparticles, agglomerated nanopowders, consolidated nanomaterials and nanocomposite materials as well as all materials classes are considered. As an important component of modern research on nanomaterials a section describes the various characterization tools available. Based on these remarks some properties of nanostructured materials will be summarized emphasizing the property-microstructure relationships. Finally, a brief outlook on applications and initial industrial use of nanomaterials is presented. IntroductionNanostructures are plentiful in nature. In the universe nanoparticles are distributed widely and are considered to be the building blocks in planet formation processes. Biological systems have built up inorganic-organic nanocomposite structures to improve the mechanical properties or to improve the optical, magnetic and chemical sensing in living species. As an example, nacre (mother-of-pearl) from the mollusc shell is a biologically formed lamellar ceramic, which "exhibits structural robustness despite the brittle nature of its constituents.[1] Figure 1 shows an SEM imge of a fracture surface of an abalone shell exhibiting the CaCO 3 -platelets which are se-

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Synthesis of bulk nanocrystalline nickel by pulsed electrodeposition

Cited by 307 publications

References 16 publications

Nanocrystalline materials and coatings

Nanocrystalline materials and coatings

Strain-Induced Reverse Phase Transformation in Nanocrystalline Co-Ni Alloys

Unique Features and Properties of Nanostructured Materials

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