Deviations from hall-petch behaviour in as-prepared nanocrystalline nickel

El-Sherik, A.M.; Erb, U.; Palumbo, G.; Aust, K.T.

doi:10.1016/0956-716x(92)90596-7

Cited by 314 publications

(153 citation statements)

References 17 publications

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“…By decreasing the grain size of metals down to the order of a few tens of nanometers, the H-P slope remains positive but with a smaller value [281][282][283][284]. At ultra-fine grained sizes below ca.…”

Section: Mechanical Behaviormentioning

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dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid.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

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

842

345

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“…The second group of materials that have been extensively studied since 1990 are nanostructures produced by ED. Table 2 shows the major improved properties of typical NC nickel produced by ED [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Synthesismentioning

confidence: 99%

Electrodeposition of nanostructured coatings and their characterization—A review

Gurrappa

Binder

2008

Science and Technology of Advanced Materials

289

140

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Nanostructured materials have gained importance in recent years due to their significantly enhanced properties. In particular, electrochemistry has a special role in producing a variety of nanostructured materials. In the current review, we discuss the superiority of electrochemical deposition techniques in synthesizing various nanomaterials that exhibit improved characteristics compared with materials produced by conventional techniques, as well as their classification, synthesis routes, properties and applications. The superior properties of a nanostructured nickel coating produced by electrochemical deposition are outlined. The properties of various nanostructured coating materials produced by electrochemical techniques are also described. Finally, the importance of nanostructured coatings in industrial applications as well as their potential in future technologies is emphasized.

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“…The softening stage appears with excessive refinement of grains due to the inverse Hall-Petch effect. 9 Grain refinement induced substantial increase of GBs can well impede the dislocation motion during plastic deformation. Such behavior plays a significant role in achieving ultrahigh strength.…”

Section: Introductionmentioning

confidence: 99%

Nanotwinned and hierarchical nanotwinned metals: a review of experimental, computational and theoretical efforts

Sun

2018

npj Comput Mater

134

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The recent studies on nanotwinned (NT) and hierarchical nanotwinned (HNT) face-centered cubic (FCC) metals are presented in this review. The HNT structures have been supposed as a kind of novel structure to bring about higher strength/ductility than NT counterparts in crystalline materials. We primarily focus on the recent developments of the experimental, atomistic and theoretical studies on the NT and HNT structures in the metallic materials. Some advanced bottom-up and top-down techniques for the fabrication of NT and HNT structures are introduced. The deformation induced HNT structures are available by virtue of severe plastic deformation (SPD) based techniques while the synthesis of growth HNT structures is so far almost unavailable. In addition, some representative molecular dynamics (MD) studies on the NT and HNT FCC metals unveil that the nanoscale effects such as twin spacing, grain size and plastic anisotropy greatly alter the performance of NT and HNT metals. The HNT structures may initiate unique phenomena in comparison with the NT ones. Furthermore, based on the phenomena and mechanisms revealed by experimental and MD simulation observations, a series of theoretical models have been proposed. They are effective to describe the mechanical behaviors of NT and HNT metals within the applicable scope. So far the development of manufacturing technologies of HNT structures, as well as the studies on the effects of HNT structures on the properties of metals are still in its infancy. Further exploration is required to promote the design of advanced materials.

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Deviations from hall-petch behaviour in as-prepared nanocrystalline nickel

Cited by 314 publications

References 17 publications

Nanocrystalline materials and coatings

Nanocrystalline materials and coatings

Electrodeposition of nanostructured coatings and their characterization—A review

Nanotwinned and hierarchical nanotwinned metals: a review of experimental, computational and theoretical efforts

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