Controllable fatigue cracking mechanisms of copper bicrystals with a coherent twin boundary

Li, L. L.; Zhang, Z. J.; Zhang, P.; Wang, Z. G.; Zhang, Z. F.

doi:10.1038/ncomms4536

Cited by 78 publications

(29 citation statements)

References 44 publications

(85 reference statements)

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“…The origin is that the TBs can serve as the nucleation sites and propagation paths of fatigue cracks due to the complicated interactions between TBs and dislocations. The most recent experimental studies [23,24] on the fatigue of bicrystalline Cu with a coherent TB have shown that when a TB is inclined to the loading direction, the fatigue crack initiates along the TB.…”

Section: Introductionmentioning

confidence: 99%

Atomistic mechanisms of fatigue in nanotwinned metals

Zhou

Chen

2015

Acta Materialia

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Section: Introductionmentioning

confidence: 99%

Atomistic mechanisms of fatigue in nanotwinned metals

Zhou

Chen

2015

Acta Materialia

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“…Grain boundaries play an important role in the ductile failure of many polycrystalline materials by acting as preferential sites for damage nucleation [1][2][3][4][5][6][7]. During fatigue loading, interactions between dislocations lead to irreversible slip which accumulates during cycling, resulting in strain localization in the form of persistent slip bands [8] in both pure metals [9][10][11] and alloys [12].…”

Section: Introductionmentioning

confidence: 99%

Amorphous intergranular films as toughening structural features

2015

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The ability of amorphous intergranular films to mitigate damage formation at grain boundaries is studied with molecular dynamics simulations. We find that such films can alter both crack nucleation and crack growth rates by efficiently absorbing dislocations, with thicker films being more effective sinks. Local plastic strain brought by incoming dislocations is diffused into a triangular region within the amorphous film and is accommodated by a flow of boundary atoms which resembles a vortex shape; this vortex grows inside of the amorphous intergranular film as more dislocations are absorbed until it reaches the opposite amorphous-crystalline interface, after which cracks can finally be nucleated. Even after nucleation, these cracks grow more sluggishly in an amorphous intergranular film than they do along a clean grain boundary, since the driving force for crack growth is lower in the amorphous film. The results presented here suggest that amorphous intergranular films can act as toughening features within a microstructure, and thus are promising for designing nanostructured materials with better ductility and fracture toughness.

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“…Shear stress transferred along the {1 1 1} planes for the fcc crystals and through edge dislocations [17]. Edge dislocation density, q e , along the slip {1 1 1} planes is estimated according to Taylor equation [18]:…”

mentioning

confidence: 99%