Grain growth kinetics in nanostructured nickel

Iordache, Mihaela; Whang, S.H.; Jiao, Zhijie; Wang, Z.M

doi:10.1016/s0965-9773(00)00427-x

Cited by 75 publications

(27 citation statements)

References 7 publications

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“…Most nanocrystalline metals have activation energy for grain growth closer to the respective grain boundary diffucion. For example, Iordache et al have studied the grain growth behavior of pure nanocrystalline Ni prepared by electrodeposition between 603 and 683 K for various periods of time [41]. The activation energy for grain growth in nano-Ni is determined to be 102 kJ/mol, which is similar to that for grain boundary diffusion in polycrystalline Ni (108 kJ/mol).…”

Section: Nanostructurementioning

confidence: 93%

“…Therefore, the activation energy for the grain growth in nanocrystalline metals is close to the activation energy for lattice diffusion. Differential scanning calorimetry (DSC) is commonly used to detect the release of interfacial grain boundary enthalpy during the grain growth process [40][41][42][43][44][45][46]. For nanocrystalline metals, (e.g.…”

Section: Nanostructurementioning

confidence: 99%

See 1 more Smart Citation

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respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid.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: Nanostructurementioning

confidence: 93%

Section: Nanostructurementioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

842

345

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“…The values are listed in Table 1 and are close to the value for boundary self-diffusion in pure nickel (115 kJ/mol) [15] and to that found for grain growth of bulk nanocrystalline nickel (102 kJ/mol). [16] …”

Section: Grain Growth Activation Energymentioning

confidence: 99%

Grain Size Effects on the Mechanical Behavior of Open‐cell Nickel Foams

Goussery¹,

Bienvenu

Forest

et al. 2004

Adv Eng Mater

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The dependence of the mechanical behavior of nickel foams upon their grain size was studied. First, the grain coarsening phenomenon which occurs during the processing of foams was analyzed. A metallurgical characterization of the grain growth during heat treatment was performed. The grain size effects on the mechanical properties was then studied, namely, via the Hall‐Petch law. The foam walls being very thin, roughly 10 μm in thickness, grain growth and mechanical behavior might be different compared with conventional materials. The present results obtained with foams were compared with literature data on bulk pure nickel and with nickel foils of 10 and 50 μm in thickness which are good candidates for the modeling of the cell walls. The EBSD technique allowed observing the absence of preferred crystallographic orientations for both foams and foils. A mechanical model in the spirit of that by Gibson and Ashby was finally presented incorporating the grain size effect on yield strength and hardening modulus. This model provided a good estimation of the experimental data.

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“…Therefore, prolonging the sintering time does not seem to be a promising method to enhance the density level significantly. On the other hand, it may be led to the grain growth phenomenon which normally takes place in polycrystalline materials so as to decrease the system energy by the reduction of total grain boundary energy [33][34][35]. Nanocrystalline materials are known to be thermodynamically unstable and success in their consolidation is intimately related to the control of the competition between densification and coarsening to maintain superior properties of the material generated by nanocrystallization [36][37][38].…”

Section: Methodsmentioning

confidence: 99%