Generation of Nanocracks at Deformation Twins in Nanomaterials

Ovid’ko, I. A.; Sheĭnerman, A. G.

doi:10.1080/21663831.2013.814091

Cited by 13 publications

(11 citation statements)

References 36 publications

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“…[16,45] Besides, the profuse deformation twins in the nanograins of NC Cu-Al alloys also promote the generation of nanocracks during deformation because of the high local stresses originating from the intersection between twins and GBs. [46,47] Thus, as exhibited in Figure 4(b), these local GB activities in the NC CuAl alloys with low SFE with extremely fine grains will inevitably impair and impede the further improvement of their fatigue strengths.…”

mentioning

confidence: 99%

Improved Fatigue Strengths of Nanocrystalline Cu and Cu–Al Alloys

Lin

Sheng

et al. 2015

Materials Research Letters

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confidence: 99%

Improved Fatigue Strengths of Nanocrystalline Cu and Cu–Al Alloys

Lin

Sheng

et al. 2015

Materials Research Letters

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“…As shown in Figure 1 According to Ovid'ko and Sheinerman [23], accompanying plastic deformation of the nanocrystalline matrix, the twin ABCD is produced in a nanoscale grain. To simplify the analysis, we suppose that the deformation twin ABCD is perpendicular to the grain boundary that stops its growth.…”

Section: Model and Problem Formulationmentioning

confidence: 99%

“…According to Gurtin and Murdoch [34], the elastic field of the bulk solid can use classic elasticity to characterize the differential equation, while the interface between the According to Ovid'ko and Sheinerman [23], accompanying plastic deformation of the nanocrystalline matrix, the twin ABCD is produced in a nanoscale grain. To simplify the analysis, we suppose that the deformation twin ABCD is perpendicular to the grain boundary that stops its growth.…”

Section: Model and Problem Formulationmentioning

confidence: 99%

“…To simplify the analysis, we suppose that the deformation twin ABCD is perpendicular to the grain boundary that stops its growth. Therefore, following Romanov and Vladimirov [46] and Ovid'ko and Sheinerman [23], the twin ABCD can be represented as a wedge disclination quadrupole. Furthermore, in the fcc crystals, the magnitude of the wedge disclination strength ω is 2arctan( √ 2/4).…”

Section: Model and Problem Formulationmentioning

confidence: 99%

“…The molecular dynamics simulations [20] are in good agreement with the experiments [21,22] documenting cracks can nucleate at twin-grain boundary intersections in coarse-grained γ -TiAl. Based on the above description, Ovid'ko and Sheinerman [23,24] built a theoretical model to study crack nucleation at the intersection of the twin and grain boundary in thin-film and bulk nanocrystalline materials. They found that the nanocrack is produced at twin thicknesses of a few nanometers, and the equilibrium nanocrack lengths increase with increasing twin thickness in bulk nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Nanoscale Inhomogeneity Incorporating Interface Effect on Crack Nucleation at Intersection of Twin and Grain Boundary in Nanocomposite

Tao

Miao

et al. 2021

Materials

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Nanocracks can generate at the intersection of the deformation twin and grain boundary (GB). A mathematical model is built to study the nanoinhomogeneity effect on nanocrack nucleation and propagation in the nanocrystalline matrix. The boundary condition at the interface between the nanoinhomogeneity and the matrix is modified by incorporating the interface effect. The influence of the nanoinhomogeneity shear modulus, the nanoinhomogeneity radius, the nanoinhomogeneity position, the interface effect, and the external stress on the nanocrack nucleation and propagation is investigated in detail. The results indicate that the stiff nanoinhomogeneity suppresses nanocrack nucleation and propagation and thereby improves the tensile ductility of nanocomposites without loss of their predominantly high strength. Both the positive interface residual tension and interface elastic constants suppress nanocrack nucleation and propagation, while the negative interface residual tension and interface elastic constants promote nanocrack nucleation and propagation. Furthermore, the effect of interface residual tension is rather significant. The interface elastic constants have a weak effect on nanocrack nucleation and propagation.

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Study of microcrack nucleation from a blocked twin with the wedge disclination model

Luo

2016

Arch Appl Mech

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Generation of Nanocracks at Deformation Twins in Nanomaterials

Cited by 13 publications

References 36 publications

Improved Fatigue Strengths of Nanocrystalline Cu and Cu–Al Alloys

Improved Fatigue Strengths of Nanocrystalline Cu and Cu–Al Alloys

Influence of Nanoscale Inhomogeneity Incorporating Interface Effect on Crack Nucleation at Intersection of Twin and Grain Boundary in Nanocomposite

Study of microcrack nucleation from a blocked twin with the wedge disclination model

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