Hall-petch relation in nanocrystalline solids

Nieh, T.G.; Wadsworth, J.

doi:10.1016/0956-716x(91)90256-z

Cited by 644 publications

(221 citation statements)

References 9 publications

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“…Thus, it appears that the increasing hardness and strength observed in pure nanophase metals with decreasing grain size is simply a result of diminishing dislocation activity. While other mechanisms that have been recently suggested (7)(8)(9)(10)(11) might also play a role, no substantial experimental evidence for metal softening in this regime has yet been produced.…”

Section: Discussionmentioning

confidence: 99%

Mechanical properties of nanophase metals

Siegel¹,

Fougere²

1995

Nanostructured Materials

341

120

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Section: Discussionmentioning

confidence: 99%

Mechanical properties of nanophase metals

Siegel¹,

Fougere²

1995

Nanostructured Materials

341

120

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“…The Hall-Petch relationship was shown to be valid for lamellar structures with an interboundary spacing of $20 nm in which the pile-ups involve approximately 10 dislocations within a single lamella [14] and the length of the pile-up is equal to the spacing between twin boundaries [15]. However, the K H value tends to decrease with decreasing interlamellar spacing, which can further lead to the so-called inverse Hall-Petch effect when the effective grain size falls below $ 10 nm [20,21].…”

Section: Introductionmentioning

confidence: 95%

Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Kusakin

Belyakov

Haase

et al. 2014

Materials Science and Engineering: A

113

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a b s t r a c tThe effect of cold rolling on the microstructure evolution and mechanical properties of Fe-23Mn-0.3C-1.5Al twinning-induced plasticity (TWIP) steel was studied. The extensive mechanical twinning subdivides the initial grains into nanoscale twin lamellas. In addition, the formation of deformation micro bands at ε440% induces the formation of nanostructured bands of localized shear. It is demonstrated that the mechanical twinning is notably important for dislocation storage within the matrix, as the twin boundaries act as equally effective obstacles to dislocation glide as conventional high-angle grain boundaries. However, the contribution of the grain size strengthening to the overall yield stress (YS) is much smaller than that of the deformation strengthening, which plays a major role in the superior work-hardening behavior of TWIP steels. A very high dislocation density of $ 2 Â 10 15 m À 2 is achieved after plastic deformation with moderate strains. The superposition of deformation strengthening and grain boundary strengthening leads to an increase in the YS from 235 MPa in the initial state to 1400 MPa after 80% rolling.

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“…The grain size is approximately 200 nm, which exceeds the critical grain size of several tens of nanometers considered a minimum for the viability of the dislocation activity. [25] When leading dislocations start to move and propagate plastic deformation into adjacent grains, the density of dislocations in the nanostructured region increases, causing work hardening.…”

Section: B Tensile Behaviormentioning

confidence: 99%

Deformation behavior of bimodal nanostructured 5083 Al alloys

Han

Lee

Witkin

et al. 2005

Metall Mater Trans A

233

120

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Cryomilled 5083 Al alloys blended with volume fractions of 15, 30, and 50 pct unmilled 5083 Al were produced by consolidation of a mixture of cryomilled 5083 Al and unmilled 5083 Al powders. A bimodal grain size was achieved in the as-extruded alloys in which nanostructured regions had a grain size of 200 nm and coarse-grained regions had a grain size of 1 m. Compression loading in the longitudinal direction resulted in elastic-perfectly plastic deformation behavior. An enhanced tensile elongation associated with the occurrence of a Lüders band was observed in the bimodal alloys. As the volume fraction of coarse grains was increased, tensile ductility increased and strength decreased. Enhanced tensile ductility was attributed to the occurrence of crack bridging as well as delamination between nanostructured and coarse-grained regions during plastic deformation.

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Hall-petch relation in nanocrystalline solids

Cited by 644 publications

References 9 publications

Mechanical properties of nanophase metals

Mechanical properties of nanophase metals

Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Deformation behavior of bimodal nanostructured 5083 Al alloys

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