Local-structure-affected behavior during self-driven grain boundary migration

Luo, Xue-Mei; Zhang, B.; Zhu, Xiaofei; Zhou, Yangtao; Xiao, Tingting; Zhang, G. P.

doi:10.1557/mrc.2016.10

Cited by 10 publications

(8 citation statements)

References 32 publications

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“…Specifically, GB-mediated deformation mechanisms, such as GB sliding [9,10], GB migration [11], or grain rotation [12], are prevalent and at least partly linked with GB annihilation in metallic nanocrystalline materials [13]. A variety of studies have been focused on the mechanical response of individual GBs [14,15], however, the nanocrystalline networks, consisting of multiple GBs, may exhibit different kinetic behaviors [16,17], which was rarely studied. The plastic deformation behavior in polycrystals, involving cooperative motion and interactions of parallel GBs or GB junctions [18,19], plays an important role and must be taken into account in practice.…”

Section: Introductionmentioning

confidence: 99%

Annihilation Mechanism of Low-Angle Grain Boundary in Nanocrystalline Metals

Zhou

Huang

Chen

et al. 2022

Metals

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Due to the high density of grain boundaries (GBs), nanocrystalline metals possess superior properties, including enhanced strength, work hardening, and fatigue resistance, in comparison to their conventional counterparts. The expectation of GB migration is critical for grain coarsening and GB annihilation in these materials, significantly affecting the polycrystalline network and mechanical behavior. Here, we perform molecular dynamics (MD) simulations on gold (Au) nanocrystals containing multiple parallelly arranged GBs, with a focus on the investigation of annihilation mechanisms of low-angle grain boundaries (LAGBs). It is observed that the shear-coupled motion of LAGBs, consisting of dislocations, gives rise to their preliminary migration with the reduced separation distance between GBs. With subsequent GB motion, the LAGBs encountered with neighboring GBs, and can be annihilated by various mechanisms, including dislocations interpenetration, dislocations interaction, or dislocations absorption, depending on the specific configuration of the neighboring GB. These findings enhance our understanding of GB interactions and shed light on the controlled fabrication of high-performance nanocrystalline metals.

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Section: Introductionmentioning

confidence: 99%

Annihilation Mechanism of Low-Angle Grain Boundary in Nanocrystalline Metals

Zhou

Huang

Chen

et al. 2022

Metals

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“…Recently, by using in situ HRTEM, Luo et al have reported the adjustment of GB structures of Cu film during a self-driven GB migration, which involves GB dissociation, partial dislocation emission from GB, and faceting/defaceting [61]. Furthermore, they revealed that GB migration ability is closely related to the local GB segment consisting of "hybrid" structural units.…”

Section: Study Of Grain Boundary Charactermentioning

confidence: 99%

Grain Boundary Effects on Microstructural Stability of Nanocrystalline Metallic Materials

Zhu¹,

Zhang²,

Chen³

2017

Study of Grain Boundary Character

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Grain boundaries play an important role in dictating the mechanical and physical properties of nanocrystalline (NC) materials because of the increased volume fraction of intercrystalline components as the grain size decreases. In general, grain boundaries have a high energy level and there exists a thermodynamic driving force to reduce the overall area of grain boundaries through grain coarsening, making NC material systems intrinsically unstable. Recent investigations also indicate that mechanical deformation can promote grain growth in NC material even at the cryogenic temperatures. In this chapter, first, the current investigation on the grain boundary structures of NC metallic materials is briefly reviewed and then the state-of-the-art of experimental results on the microstructural stability during deformation processes is discussed. Finally, several key issues for improving the microstructure stability of NC metallic materials and possible future work are discussed.

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“…[44] GB migration would also be involved in grain growth to combine the small neighbor grains. During the migration process, the local GB environment would be changed, [50][51][52] which would promote the emission of the partial along with local changes in GB orientation, GB structure and GB dislocation distribution. [50,53,54] Furthermore, coupled with the high stress concentration at the crack tip, numerous twinning partials would be emitted from the GBs to form a twin.…”

Section: Twinning Mechanismsmentioning

confidence: 99%

“…During the migration process, the local GB environment would be changed, [50][51][52] which would promote the emission of the partial along with local changes in GB orientation, GB structure and GB dislocation distribution. [50,53,54] Furthermore, coupled with the high stress concentration at the crack tip, numerous twinning partials would be emitted from the GBs to form a twin. Thus, successive emission of partials would happen during the grain growth process, so that we can observe the highly curved TB with so many TBs connected by ITBs, as shown in Figure 2(c).…”

Section: Twinning Mechanismsmentioning

confidence: 99%

Forming incoherent twin boundaries: a new way for nanograin growth under cyclic loading

Luo

Zhang

2016

Materials Research Letters

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Obvious grain growth was observed in regions around the fatigue cracks in the Au thin films under cyclic loading. Dominant generation of twin boundaries (TBs) and low-angle grain boundaries was observed in the coarsened grains. The experimental evidence shows that the newly formed TBs are mainly incoherent TBs, rather than the classical coherent TBs. IMPACT STATEMENTA number of newly formed twin boundaries (TBs) are observed to be mainly incoherent TBs rather than the classical coherent TBs in the coarsened grains of the fatigued Au film.

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Local-structure-affected behavior during self-driven grain boundary migration

Abstract: Abstract

Cited by 10 publications

References 32 publications

Annihilation Mechanism of Low-Angle Grain Boundary in Nanocrystalline Metals

Annihilation Mechanism of Low-Angle Grain Boundary in Nanocrystalline Metals

Grain Boundary Effects on Microstructural Stability of Nanocrystalline Metallic Materials

Forming incoherent twin boundaries: a new way for nanograin growth under cyclic loading

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