Yield stress of nanocrystalline materials: role of grain-boundary dislocations, triple junctions and Coble creep

Gutkin, M. Yu.; Ovid’ko, I. A.; Pande, C. S.

doi:10.1080/14786430310001616063

Cited by 37 publications

(13 citation statements)

References 35 publications

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“…where 3d d is the volume fraction of the grain boundary region [76,77] Grain boundary sliding described in terms of a viscous and a plastic accommodation term s p . Grain boundary sliding accounts for a third of the behaviour (see Fig.…”

Section: Mechanisms Governing Grain Size Weakeningmentioning

confidence: 99%

The Hall–Petch and inverse Hall–Petch relations and the hardness of nanocrystalline metals

2019

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We review some of the factors that influence the hardness of polycrystalline materials with grain sizes less than 1 lm. The fundamental physical mechanisms that govern the hardness of nanocrystalline materials are discussed. The recently proposed dislocation curvature model for grain size-dependent strengthening and the 60-year-old Hall-Petch relationship are compared. For grains less than 30 nm in size, there is evidence for a transition from dislocationbased plasticity to grain boundary sliding, rotation, or diffusion as the main mechanism responsible for hardness. The evidence surrounding the inverse Hall-Petch phenomenon is found to be inconclusive due to processing artefacts, grain growth effects, and errors associated with the conversion of hardness to yield strength in nanocrystalline materials.

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Section: Mechanisms Governing Grain Size Weakeningmentioning

confidence: 99%

The Hall–Petch and inverse Hall–Petch relations and the hardness of nanocrystalline metals

2019

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“…They assumed that the work needed to create the extra grain boundaries is equal to the work done by the external force which is responsible for the grain boundary sliding. Gutkin et al [82] attributed the strengthening of nanocrystalline materials to the role of triple junctions of grain boundaries acting as obstacles for grain boundary sliding. They assumed that the dependence of the yield stress on grain size and triple junction angles is determined by a competition between dislocation slip and grain boundary sliding.…”

Section: Homophase Interface In a Metal-metal-compositementioning

confidence: 99%

Latest Developments in Modeling and Characterization of Joining Metal Based Hybrid Materials

et al. 2018

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Advanced materials consist of several materials systems that exhibit complementary properties for multipurpose applications. Joining of dissimilar materials is a critical and challenging advanced manufacturing technique to develop novel hybrid materials with properties fully transferred. The "bonding strength" of a joint is crucial for its integrity and performance. The bonding strength is affected by a range of parameters that can be better understood, controlled, and optimized via both experimental and analytical approaches. In this paper, the authors review the theoretical and experimental studies of the interface inside several metal based composites. The scope includes interface bonding's critical parameters, characterization techniques of joining processes, potential applications, and their future perspectives. The review is significant to develop advanced manufacturing techniques for heterogeneous materials and to design innovative heterogeneous systems for various medical, electrical, electronics, industrial, and other daily life applications that involve the broad range of "joining" processes.

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“…One is to involve specific physical mechanisms based on NC material deformation, such as GB diffusional creep [9,10] , interaction with GB dislocations [11] , GB sliding [12,13] , triple junction diffusional creep [14] and triple junction rotational mode [15,16] . Gutkin, et al [17] has studied the role of GB, triple junction and Coble creep on the yield stress of NC materials. And the other is based on a rule-of-mixture approach [18] which has become one of the widely spread ways to describe the Hall-Petch relation for nanostructured solids and its main idea is to treat a complex solid as a whole and use the simplest rule of mixture to estimate some macroscopic physical quantity.…”

Section: Introductionmentioning

confidence: 99%

Scale effect and geometric shapes of grains

郭辉

郭兴明

2007

Appl Math Mech

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The rule-of-mixture approach has become one of the widely spread ways to investigate the mechanical properties of nano-materials and nano-structures, and it is very important for the simulation results to exactly compute phase volume fractions. The nanocrystalline (NC) materials are treated as three-phase composites consisting of grain core phase, grain boundary (GB) phase and triple junction phase, and a two-dimensional three-phase mixture regular polygon model is established to investigate the scale effect of mechanical properties of NC materials due to the geometrical polyhedron characteristics of crystal grain. For different multi-sided geometrical shapes of grains, the corresponding regular polygon model is adopted to obtain more precise phase volume fractions and exactly predict the mechanical properties of NC materials.

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Yield stress of nanocrystalline materials: role of grain-boundary dislocations, triple junctions and Coble creep

Cited by 37 publications

References 35 publications

The Hall–Petch and inverse Hall–Petch relations and the hardness of nanocrystalline metals

The Hall–Petch and inverse Hall–Petch relations and the hardness of nanocrystalline metals

Latest Developments in Modeling and Characterization of Joining Metal Based Hybrid Materials

Scale effect and geometric shapes of grains

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